/* * Copyright (C) 2014 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define BTSTACK_FILE__ "gatt_client.c" #include #include #include #include "btstack_config.h" #include "ble/att_dispatch.h" #include "ble/att_db.h" #include "ble/gatt_client.h" #include "ble/le_device_db.h" #include "ble/sm.h" #include "bluetooth_psm.h" #include "btstack_debug.h" #include "btstack_event.h" #include "btstack_memory.h" #include "btstack_run_loop.h" #include "btstack_util.h" #include "hci.h" #include "hci_dump.h" #include "hci_event_builder.h" #include "l2cap.h" #include "classic/sdp_client.h" #include "bluetooth_gatt.h" #include "bluetooth_sdp.h" #include "classic/sdp_util.h" #if defined(ENABLE_GATT_OVER_EATT) && !defined(ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE) #error "GATT Over EATT requires support for L2CAP Enhanced CoC. Please enable ENABLE_L2CAP_ENHANCED_CREDIT_BASED_FLOW_CONTROL_MODE" #endif // L2CAP Test Spec p35 defines a minimum of 100 ms, but PTS might indicate an error if we sent after 100 ms #define GATT_CLIENT_COLLISION_BACKOFF_MS 150 static btstack_linked_list_t gatt_client_connections; static btstack_linked_list_t gatt_client_value_listeners; static btstack_linked_list_t gatt_client_service_value_listeners; #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED static btstack_linked_list_t gatt_client_service_changed_handler; #endif static btstack_packet_callback_registration_t hci_event_callback_registration; static btstack_packet_callback_registration_t sm_event_callback_registration; static btstack_context_callback_registration_t gatt_client_deferred_event_emit; // GATT Client Configuration static bool gatt_client_mtu_exchange_enabled; static gap_security_level_t gatt_client_required_security_level; static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code); #ifdef ENABLE_LE_SIGNED_WRITE static void att_signed_write_handle_cmac_result(uint8_t hash[8]); #endif #ifdef ENABLE_GATT_OVER_CLASSIC static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid); static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status); static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client); static void gatt_client_classic_retry(btstack_timer_source_t * ts); #endif #ifdef ENABLE_GATT_OVER_EATT static bool gatt_client_eatt_enabled; static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client); static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts); #endif void gatt_client_init(void){ gatt_client_connections = NULL; gatt_client_value_listeners = NULL; gatt_client_service_value_listeners = NULL; #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED gatt_client_service_changed_handler = NULL; #endif // default configuration gatt_client_mtu_exchange_enabled = true; gatt_client_required_security_level = LEVEL_0; // register for HCI Events hci_event_callback_registration.callback = &gatt_client_event_packet_handler; hci_add_event_handler(&hci_event_callback_registration); // register for SM Events sm_event_callback_registration.callback = &gatt_client_event_packet_handler; sm_add_event_handler(&sm_event_callback_registration); // and ATT Client PDUs att_dispatch_register_client(gatt_client_att_packet_handler); #ifdef ENABLE_GATT_OVER_EATT gatt_client_eatt_enabled = true; #endif } void gatt_client_set_required_security_level(gap_security_level_t level){ gatt_client_required_security_level = level; } static gatt_client_t * gatt_client_for_timer(btstack_timer_source_t * ts){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_connections); while (btstack_linked_list_iterator_has_next(&it)){ gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (&gatt_client->gc_timeout == ts) { return gatt_client; } } return NULL; } static void gatt_client_timeout_handler(btstack_timer_source_t * timer){ gatt_client_t * gatt_client = gatt_client_for_timer(timer); if (gatt_client == NULL) return; log_info("GATT client timeout handle, handle 0x%02x", gatt_client->con_handle); gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_TIMEOUT); } static void gatt_client_timeout_start(gatt_client_t * gatt_client){ log_debug("GATT client timeout start, handle 0x%02x", gatt_client->con_handle); btstack_run_loop_remove_timer(&gatt_client->gc_timeout); btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_timeout_handler); btstack_run_loop_set_timer(&gatt_client->gc_timeout, 30000); // 30 seconds sm timeout btstack_run_loop_add_timer(&gatt_client->gc_timeout); } static void gatt_client_timeout_stop(gatt_client_t * gatt_client){ log_debug("GATT client timeout stop, handle 0x%02x", gatt_client->con_handle); btstack_run_loop_remove_timer(&gatt_client->gc_timeout); } static gap_security_level_t gatt_client_le_security_level_for_connection(hci_con_handle_t con_handle){ uint8_t encryption_key_size = gap_encryption_key_size(con_handle); if (encryption_key_size == 0) return LEVEL_0; bool authenticated = gap_authenticated(con_handle); if (!authenticated) return LEVEL_2; return encryption_key_size == 16 ? LEVEL_4 : LEVEL_3; } static gatt_client_t * gatt_client_get_context_for_handle(uint16_t handle){ btstack_linked_item_t *it; for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ gatt_client_t * gatt_client = (gatt_client_t *) it; if (gatt_client->con_handle == handle){ return gatt_client; } } return NULL; } // @return gatt_client context // returns existing one, or tries to setup new one static uint8_t gatt_client_provide_context_for_handle(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client != NULL){ *out_gatt_client = gatt_client; return ERROR_CODE_SUCCESS; } // bail if no such hci connection hci_connection_t * hci_connection = hci_connection_for_handle(con_handle); if (hci_connection == NULL){ log_error("No connection for handle 0x%04x", con_handle); *out_gatt_client = NULL; return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } gatt_client = btstack_memory_gatt_client_get(); if (gatt_client == NULL){ *out_gatt_client = NULL; return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; } // init state gatt_client->bearer_type = ATT_BEARER_UNENHANCED_LE; gatt_client->con_handle = con_handle; gatt_client->mtu = ATT_DEFAULT_MTU; gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); if (gatt_client_mtu_exchange_enabled){ gatt_client->mtu_state = SEND_MTU_EXCHANGE; } else { gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; } gatt_client->state = P_READY; gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W2_SEND; #ifdef ENABLE_GATT_OVER_EATT gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; #endif btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); // get unenhanced att bearer state if (hci_connection->att_connection.mtu_exchanged){ gatt_client->mtu = hci_connection->att_connection.mtu; gatt_client->mtu_state = MTU_EXCHANGED; } *out_gatt_client = gatt_client; return ERROR_CODE_SUCCESS; } static bool is_ready(gatt_client_t * gatt_client){ return gatt_client->state == P_READY; } static uint8_t gatt_client_provide_context_for_request(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ gatt_client_t * gatt_client = NULL; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } #ifdef ENABLE_GATT_OVER_EATT if ((gatt_client->eatt_state == GATT_CLIENT_EATT_READY) && gatt_client_eatt_enabled){ btstack_linked_list_iterator_t it; gatt_client_t * eatt_client = NULL; // find free eatt client btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it)){ gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (client->state == P_READY){ eatt_client = client; break; } } if (eatt_client == NULL){ return ERROR_CODE_COMMAND_DISALLOWED; } gatt_client = eatt_client; } #endif if (is_ready(gatt_client) == false){ return GATT_CLIENT_IN_WRONG_STATE; } gatt_client_timeout_start(gatt_client); *out_gatt_client = gatt_client; return status; } int gatt_client_is_ready(hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return 0; } return is_ready(gatt_client) ? 1 : 0; } void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled){ gatt_client_mtu_exchange_enabled = enabled != 0; } uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ *mtu = 0; return status; } if ((gatt_client->mtu_state == MTU_EXCHANGED) || (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED)){ *mtu = gatt_client->mtu; return ERROR_CODE_SUCCESS; } *mtu = ATT_DEFAULT_MTU; return GATT_CLIENT_IN_WRONG_STATE; } static uint8_t *gatt_client_reserve_request_buffer(gatt_client_t *gatt_client) { switch (gatt_client->bearer_type){ #ifdef ENABLE_GATT_OVER_CLASSIC case ATT_BEARER_UNENHANCED_CLASSIC: #endif case ATT_BEARER_UNENHANCED_LE: l2cap_reserve_packet_buffer(); return l2cap_get_outgoing_buffer(); #ifdef ENABLE_GATT_OVER_EATT case ATT_BEARER_ENHANCED_LE: return gatt_client->eatt_storage_buffer; #endif default: btstack_unreachable(); break; } return NULL; } // precondition: can_send_packet_now == TRUE static uint8_t gatt_client_send(gatt_client_t * gatt_client, uint16_t len){ switch (gatt_client->bearer_type){ case ATT_BEARER_UNENHANCED_LE: return l2cap_send_prepared_connectionless(gatt_client->con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, len); #ifdef ENABLE_GATT_OVER_CLASSIC case ATT_BEARER_UNENHANCED_CLASSIC: return l2cap_send_prepared(gatt_client->l2cap_cid, len); #endif #ifdef ENABLE_GATT_OVER_EATT case ATT_BEARER_ENHANCED_LE: return l2cap_send(gatt_client->l2cap_cid, gatt_client->eatt_storage_buffer, len); #endif default: btstack_unreachable(); return ERROR_CODE_HARDWARE_FAILURE; } } // precondition: can_send_packet_now == TRUE static uint8_t att_confirmation(gatt_client_t * gatt_client) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = ATT_HANDLE_VALUE_CONFIRMATION; return gatt_client_send(gatt_client, 1); } // precondition: can_send_packet_now == TRUE static uint8_t att_find_information_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t start_handle, uint16_t end_handle) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, start_handle); little_endian_store_16(request, 3, end_handle); return gatt_client_send(gatt_client, 5); } // precondition: can_send_packet_now == TRUE static uint8_t att_find_by_type_value_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_group_type, uint16_t start_handle, uint16_t end_handle, uint8_t *value, uint16_t value_size) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, start_handle); little_endian_store_16(request, 3, end_handle); little_endian_store_16(request, 5, attribute_group_type); (void)memcpy(&request[7], value, value_size); return gatt_client_send(gatt_client, 7u + value_size); } // precondition: can_send_packet_now == TRUE static uint8_t att_read_by_type_or_group_request_for_uuid16(gatt_client_t *gatt_client, uint8_t request_type, uint16_t uuid16, uint16_t start_handle, uint16_t end_handle) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, start_handle); little_endian_store_16(request, 3, end_handle); little_endian_store_16(request, 5, uuid16); return gatt_client_send(gatt_client, 7); } // precondition: can_send_packet_now == TRUE static uint8_t att_read_by_type_or_group_request_for_uuid128(gatt_client_t *gatt_client, uint8_t request_type, const uint8_t *uuid128, uint16_t start_handle, uint16_t end_handle) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, start_handle); little_endian_store_16(request, 3, end_handle); reverse_128(uuid128, &request[5]); return gatt_client_send(gatt_client, 21); } // precondition: can_send_packet_now == TRUE static uint8_t att_read_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, attribute_handle); return gatt_client_send(gatt_client, 3); } // precondition: can_send_packet_now == TRUE static uint8_t att_read_blob_request(gatt_client_t *gatt_client, uint8_t request_type, uint16_t attribute_handle, uint16_t value_offset) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = request_type; little_endian_store_16(request, 1, attribute_handle); little_endian_store_16(request, 3, value_offset); return gatt_client_send(gatt_client, 5); } static uint8_t att_read_multiple_request_with_opcode(gatt_client_t *gatt_client, uint16_t num_value_handles, uint16_t *value_handles, uint8_t opcode) { uint8_t *request = gatt_client_reserve_request_buffer(gatt_client); request[0] = opcode; uint16_t i; uint16_t offset = 1; for (i=0;imtu - 5u; if (gatt_client->attribute_offset >= gatt_client->attribute_length) { return 0; } uint16_t rest_length = gatt_client->attribute_length - gatt_client->attribute_offset; if (max_blob_length > rest_length){ return rest_length; } return max_blob_length; } static void send_gatt_services_request(gatt_client_t *gatt_client){ att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_GROUP_TYPE_REQUEST, gatt_client->uuid16, gatt_client->start_group_handle, gatt_client->end_group_handle); } static void send_gatt_by_uuid_request(gatt_client_t *gatt_client, uint16_t attribute_group_type){ if (gatt_client->uuid16 != 0u){ uint8_t uuid16[2]; little_endian_store_16(uuid16, 0, gatt_client->uuid16); att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, gatt_client->start_group_handle, gatt_client->end_group_handle, uuid16, 2); return; } uint8_t uuid128[16]; reverse_128(gatt_client->uuid128, uuid128); att_find_by_type_value_request(gatt_client, ATT_FIND_BY_TYPE_VALUE_REQUEST, attribute_group_type, gatt_client->start_group_handle, gatt_client->end_group_handle, uuid128, 16); } static void send_gatt_services_by_uuid_request(gatt_client_t *gatt_client){ send_gatt_by_uuid_request(gatt_client, GATT_PRIMARY_SERVICE_UUID); } static void send_gatt_included_service_uuid_request(gatt_client_t *gatt_client){ att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->query_start_handle); } static void send_gatt_included_service_request(gatt_client_t *gatt_client){ att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, GATT_INCLUDE_SERVICE_UUID, gatt_client->start_group_handle, gatt_client->end_group_handle); } static void send_gatt_characteristic_request(gatt_client_t *gatt_client){ att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, GATT_CHARACTERISTICS_UUID, gatt_client->start_group_handle, gatt_client->end_group_handle); } static void send_gatt_characteristic_descriptor_request(gatt_client_t *gatt_client){ att_find_information_request(gatt_client, ATT_FIND_INFORMATION_REQUEST, gatt_client->start_group_handle, gatt_client->end_group_handle); } static void send_gatt_read_characteristic_value_request(gatt_client_t *gatt_client){ att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); } static void send_gatt_read_by_type_request(gatt_client_t * gatt_client){ if (gatt_client->uuid16 != 0u){ att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, gatt_client->uuid16, gatt_client->start_group_handle, gatt_client->end_group_handle); } else { att_read_by_type_or_group_request_for_uuid128(gatt_client, ATT_READ_BY_TYPE_REQUEST, gatt_client->uuid128, gatt_client->start_group_handle, gatt_client->end_group_handle); } } static void send_gatt_read_blob_request(gatt_client_t *gatt_client){ if (gatt_client->attribute_offset == 0){ att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); } else { att_read_blob_request(gatt_client, ATT_READ_BLOB_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_offset); } } static void send_gatt_read_multiple_request(gatt_client_t * gatt_client){ att_read_multiple_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); } #ifdef ENABLE_GATT_OVER_EATT static void send_gatt_read_multiple_variable_request(gatt_client_t * gatt_client){ att_read_multiple_variable_request(gatt_client, gatt_client->read_multiple_handle_count, gatt_client->read_multiple_handles); } #endif static void send_gatt_write_attribute_value_request(gatt_client_t * gatt_client){ att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value); } static void send_gatt_write_client_characteristic_configuration_request(gatt_client_t * gatt_client){ att_write_request(gatt_client, ATT_WRITE_REQUEST, gatt_client->client_characteristic_configuration_handle, 2, gatt_client->client_characteristic_configuration_value); } static void send_gatt_prepare_write_request(gatt_client_t * gatt_client){ att_prepare_write_request(gatt_client, ATT_PREPARE_WRITE_REQUEST, gatt_client->attribute_handle, gatt_client->attribute_offset, write_blob_length(gatt_client), gatt_client->attribute_value); } static void send_gatt_execute_write_request(gatt_client_t * gatt_client){ att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 1); } static void send_gatt_cancel_prepared_write_request(gatt_client_t * gatt_client){ att_execute_write_request(gatt_client, ATT_EXECUTE_WRITE_REQUEST, 0); } #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY static void send_gatt_read_client_characteristic_configuration_request(gatt_client_t * gatt_client){ att_read_by_type_or_group_request_for_uuid16(gatt_client, ATT_READ_BY_TYPE_REQUEST, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, gatt_client->start_group_handle, gatt_client->end_group_handle); } #endif static void send_gatt_read_characteristic_descriptor_request(gatt_client_t * gatt_client){ att_read_request(gatt_client, ATT_READ_REQUEST, gatt_client->attribute_handle); } #ifdef ENABLE_LE_SIGNED_WRITE static void send_gatt_signed_write_request(gatt_client_t * gatt_client, uint32_t sign_counter){ att_signed_write_request(gatt_client, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, gatt_client->cmac); } #endif static uint16_t get_last_result_handle_from_service_list(uint8_t * packet, uint16_t size){ if (size < 2) return 0xffff; uint8_t attr_length = packet[1]; if ((2 + attr_length) > size) return 0xffff; return little_endian_read_16(packet, size - attr_length + 2u); } static uint16_t get_last_result_handle_from_characteristics_list(uint8_t * packet, uint16_t size){ if (size < 2) return 0xffff; uint8_t attr_length = packet[1]; if ((2 + attr_length) > size) return 0xffff; return little_endian_read_16(packet, size - attr_length + 3u); } static uint16_t get_last_result_handle_from_included_services_list(uint8_t * packet, uint16_t size){ if (size < 2) return 0xffff; uint8_t attr_length = packet[1]; if ((2 + attr_length) > size) return 0xffff; return little_endian_read_16(packet, size - attr_length); } #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED static void gatt_client_service_emit_event(gatt_client_t * gatt_client, uint8_t * event, uint16_t size){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_service_changed_handler); while (btstack_linked_list_iterator_has_next(&it)) { btstack_packet_callback_registration_t *callback = (btstack_packet_callback_registration_t *) btstack_linked_list_iterator_next(&it); (*callback->callback)(HCI_EVENT_PACKET, (uint16_t) gatt_client->con_handle, event, size); } } static void gatt_client_service_emit_database_hash(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { if (value_len == 16){ uint8_t event[21]; hci_event_builder_context_t context; hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_DATABASE_HASH); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_bytes(&context, value, 16); gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); } } static void gatt_client_service_emit_service_changed(gatt_client_t *gatt_client, const uint8_t *value, uint16_t value_len) { if (value_len == 4){ uint8_t event[9]; hci_event_builder_context_t context; hci_event_builder_init(&context, event, sizeof(event), HCI_EVENT_GATTSERVICE_META, GATTSERVICE_SUBEVENT_GATT_SERVICE_CHANGED); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_bytes(&context, value, 4); gatt_client_service_emit_event(gatt_client, event, hci_event_builder_get_length(&context)); } } static void gatt_client_service_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); // ok: handling own l2cap events UNUSED(size); // ok: there is no channel hci_con_handle_t con_handle; gatt_client_t *gatt_client; gatt_client_service_t service; gatt_client_characteristic_t characteristic; switch (packet_type) { case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)) { case GATT_EVENT_SERVICE_QUERY_RESULT: con_handle = gatt_event_service_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_W4_DONE); gatt_event_service_query_result_get_service(packet, &service); gatt_client->gatt_service_start_group_handle = service.start_group_handle; gatt_client->gatt_service_end_group_handle = service.end_group_handle; break; case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: con_handle = gatt_event_characteristic_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE); gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); switch (characteristic.uuid16){ case ORG_BLUETOOTH_CHARACTERISTIC_GATT_SERVICE_CHANGED: gatt_client->gatt_service_changed_value_handle = characteristic.value_handle; gatt_client->gatt_service_changed_end_handle = characteristic.end_handle; break; case ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH: gatt_client->gatt_service_database_hash_value_handle = characteristic.value_handle; gatt_client->gatt_service_database_hash_end_handle = characteristic.end_handle; break; default: break; } break; case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->gatt_service_state == GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE); gatt_client_service_emit_database_hash(gatt_client, gatt_event_characteristic_value_query_result_get_value(packet), gatt_event_characteristic_value_query_result_get_value_length(packet)); break; case GATT_EVENT_QUERY_COMPLETE: con_handle = gatt_event_query_complete_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); switch (gatt_client->gatt_service_state) { case GATT_CLIENT_SERVICE_DISCOVER_W4_DONE: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND; break; case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND; break; case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND; break; case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND; break; case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; break; default: btstack_unreachable(); break; } break; default: break; } break; default: break; } } #endif static void gatt_client_notify_can_send_query(gatt_client_t * gatt_client){ #ifdef ENABLE_GATT_OVER_EATT // if eatt is ready, notify all clients that can send a query if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it)){ gatt_client_t * client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (client->state == P_READY){ // call callback btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); if (callback == NULL) { return; } (*callback->callback)(callback->context); } } return; } #endif while (gatt_client->state == P_READY){ bool query_sent = false; UNUSED(query_sent); #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED uint8_t status = ERROR_CODE_SUCCESS; gatt_client_service_t gatt_service; gatt_client_characteristic_t characteristic; switch (gatt_client->gatt_service_state){ case GATT_CLIENT_SERVICE_DISCOVER_W2_SEND: gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_W4_DONE; status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_service_packet_handler, gatt_client->con_handle, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); query_sent = true; break; case GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W2_SEND: if (gatt_client->gatt_service_start_group_handle != 0){ gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DISCOVER_CHARACTERISTICS_W4_DONE; gatt_service.start_group_handle = gatt_client->gatt_service_start_group_handle; gatt_service.end_group_handle = gatt_client->gatt_service_end_group_handle; status = gatt_client_discover_characteristics_for_service(&gatt_client_service_packet_handler, gatt_client->con_handle, &gatt_service); query_sent = true; break; } /* fall through */ case GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W2_SEND: if (gatt_client->gatt_service_changed_value_handle != 0){ gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_SERVICE_CHANGED_WRITE_CCCD_W4_DONE; characteristic.value_handle = gatt_client->gatt_service_changed_value_handle; characteristic.end_handle = gatt_client->gatt_service_changed_end_handle; // we assume good case. We cannot do much otherwise characteristic.properties = ATT_PROPERTY_INDICATE; status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, gatt_client->con_handle, &characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); query_sent = true; break; } /* fall through */ case GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W2_SEND: if (gatt_client->gatt_service_database_hash_value_handle != 0){ gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_READ_W4_DONE; status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_service_packet_handler, gatt_client->con_handle, 0x0001, 0xffff, ORG_BLUETOOTH_CHARACTERISTIC_DATABASE_HASH); query_sent = true; break; } /* fall through */ case GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W2_SEND: if (gatt_client->gatt_service_database_hash_value_handle != 0) { gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DATABASE_HASH_WRITE_CCCD_W4_DONE; characteristic.value_handle = gatt_client->gatt_service_database_hash_value_handle; characteristic.end_handle = gatt_client->gatt_service_database_hash_end_handle; // we assume good case. We cannot do much otherwise characteristic.properties = ATT_PROPERTY_INDICATE; status = gatt_client_write_client_characteristic_configuration(&gatt_client_service_packet_handler, gatt_client->con_handle, &characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION); query_sent = true; break; } // DONE gatt_client->gatt_service_state = GATT_CLIENT_SERVICE_DONE; break; default: break; } btstack_assert(status == ERROR_CODE_SUCCESS); UNUSED(status); if (query_sent){ continue; } #endif #ifdef ENABLE_GATT_OVER_EATT query_sent = gatt_client_le_enhanced_handle_can_send_query(gatt_client); if (query_sent){ continue; } #endif btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->query_requests); if (callback == NULL) { return; } (*callback->callback)(callback->context); } } // test if notification/indication should be delivered to application (BLESA) static bool gatt_client_accept_server_message(gatt_client_t *gatt_client) { // ignore messages until re-encryption is complete if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; // after that ignore if bonded but not encrypted return !gap_bonded(gatt_client->con_handle) || (gap_encryption_key_size(gatt_client->con_handle) > 0); } static void emit_event_new(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ if (!callback) return; hci_dump_btstack_event(packet, size); (*callback)(HCI_EVENT_PACKET, 0, packet, size); } static void emit_gatt_complete_event(gatt_client_t * gatt_client, uint8_t att_status){ // @format H122 uint8_t packet[9]; hci_event_builder_context_t context; hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_QUERY_COMPLETE, 0); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_16(&context, gatt_client->service_id); hci_event_builder_add_16(&context, gatt_client->connection_id); hci_event_builder_add_08(&context, att_status); emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); } static void emit_gatt_service_query_result_event(gatt_client_t * gatt_client, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ // @format H22X uint8_t packet[28]; hci_event_builder_context_t context; hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_SERVICE_QUERY_RESULT, 0); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_16(&context, gatt_client->service_id); hci_event_builder_add_16(&context, gatt_client->connection_id); hci_event_builder_add_16(&context, start_group_handle); hci_event_builder_add_16(&context, end_group_handle); hci_event_builder_add_128(&context, uuid128); emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); } static void emit_gatt_included_service_query_result_event(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t start_group_handle, uint16_t end_group_handle, const uint8_t * uuid128){ // @format H22X uint8_t packet[30]; hci_event_builder_context_t context; hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT, 0); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_16(&context, gatt_client->service_id); hci_event_builder_add_16(&context, gatt_client->connection_id); hci_event_builder_add_16(&context, include_handle); hci_event_builder_add_16(&context, start_group_handle); hci_event_builder_add_16(&context, end_group_handle); hci_event_builder_add_128(&context, uuid128); emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); } static void emit_gatt_characteristic_query_result_event(gatt_client_t * gatt_client, uint16_t start_handle, uint16_t value_handle, uint16_t end_handle, uint16_t properties, const uint8_t * uuid128){ // @format H22Y uint8_t packet[32]; hci_event_builder_context_t context; hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_CHARACTERISTIC_QUERY_RESULT, 0); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_16(&context, gatt_client->service_id); hci_event_builder_add_16(&context, gatt_client->connection_id); hci_event_builder_add_16(&context, start_handle); hci_event_builder_add_16(&context, value_handle); hci_event_builder_add_16(&context, end_handle); hci_event_builder_add_16(&context, properties); hci_event_builder_add_128(&context, uuid128); emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); } static void emit_gatt_all_characteristic_descriptors_result_event( gatt_client_t * gatt_client, uint16_t descriptor_handle, const uint8_t * uuid128){ // @format H22Z uint8_t packet[26]; hci_event_builder_context_t context; hci_event_builder_init(&context, packet, sizeof(packet), GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 0); hci_event_builder_add_con_handle(&context, gatt_client->con_handle); hci_event_builder_add_16(&context, gatt_client->service_id); hci_event_builder_add_16(&context, gatt_client->connection_id); hci_event_builder_add_16(&context, descriptor_handle); hci_event_builder_add_128(&context, uuid128); emit_event_new(gatt_client->callback, packet, hci_event_builder_get_length(&context)); } static void emit_gatt_mtu_exchanged_result_event(gatt_client_t * gatt_client, uint16_t new_mtu){ // @format H2 uint8_t packet[6]; packet[0] = GATT_EVENT_MTU; packet[1] = sizeof(packet) - 2u; little_endian_store_16(packet, 2, gatt_client->con_handle); little_endian_store_16(packet, 4, new_mtu); att_dispatch_client_mtu_exchanged(gatt_client->con_handle, new_mtu); emit_event_new(gatt_client->callback, packet, sizeof(packet)); } // helper static void gatt_client_handle_transaction_complete(gatt_client_t *gatt_client, uint8_t att_status) { gatt_client->state = P_READY; gatt_client_timeout_stop(gatt_client); emit_gatt_complete_event(gatt_client, att_status); gatt_client_notify_can_send_query(gatt_client); } // @return packet pointer // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers + 4 pre_buffer bytes #define CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 12 static uint8_t * setup_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, uint8_t *value, uint16_t length, uint16_t service_id, uint16_t connection_id) { #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION // copy value into test packet for testing static uint8_t packet[1000]; memcpy(&packet[CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); #else // before the value inside the ATT PDU uint8_t * packet = value - CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; #endif packet[0] = type; packet[1] = CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; little_endian_store_16(packet, 2, gatt_client->con_handle); little_endian_store_16(packet, 4, service_id); little_endian_store_16(packet, 6, connection_id); little_endian_store_16(packet, 8, attribute_handle); little_endian_store_16(packet, 10, length); return packet; } // @return packet pointer // @note assume that value is part of an l2cap buffer - overwrite HCI + L2CAP packet headers + 6 pre_buffer bytes #define LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE 14 // L2CAP Header (4) + ACL Header (4) => 8 bytes #if !defined(HCI_INCOMING_PRE_BUFFER_SIZE) || ((HCI_INCOMING_PRE_BUFFER_SIZE < LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 8)) #error "Long Characteristic reads requires HCI_INCOMING_PRE_BUFFER_SIZE >= 6" #endif static uint8_t * setup_long_characteristic_value_packet(const gatt_client_t *gatt_client, uint8_t type, uint16_t attribute_handle, uint16_t offset, uint8_t *value, uint16_t length) { #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION // avoid using pre ATT headers. // copy value into test packet for testing static uint8_t packet[1000]; memcpy(&packet[LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE], value, length); #else // before the value inside the ATT PDU uint8_t * packet = value - LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE; #endif packet[0] = type; packet[1] = LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE - 2 + length; little_endian_store_16(packet, 2, gatt_client->con_handle); little_endian_store_16(packet, 4, gatt_client->service_id); little_endian_store_16(packet, 6, gatt_client->connection_id); little_endian_store_16(packet, 8, attribute_handle); little_endian_store_16(packet, 10, offset); little_endian_store_16(packet, 12, length); return packet; } #if (LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE > CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE) #define REPORT_PREBUFFER_HEADER LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE #else #define REPORT_PREBUFFER_HEADER CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE #endif /// static void report_gatt_services(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ if (size < 2) return; uint8_t attr_length = packet[1]; uint8_t uuid_length = attr_length - 4u; int i; for (i = 2; (i+attr_length) <= size; i += attr_length){ uint16_t start_group_handle = little_endian_read_16(packet,i); uint16_t end_group_handle = little_endian_read_16(packet,i+2); uint8_t uuid128[16]; uint16_t uuid16 = 0; if (uuid_length == 2u){ uuid16 = little_endian_read_16(packet, i+4); uuid_add_bluetooth_prefix((uint8_t*) &uuid128, uuid16); } else if (uuid_length == 16u) { reverse_128(&packet[i+4], uuid128); } else { return; } emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, uuid128); } } static void report_gatt_characteristic_start_found(gatt_client_t * gatt_client, uint16_t start_handle, uint8_t properties, uint16_t value_handle, uint8_t * uuid, uint16_t uuid_length){ uint8_t uuid128[16]; uint16_t uuid16 = 0; if (uuid_length == 2u){ uuid16 = little_endian_read_16(uuid, 0); uuid_add_bluetooth_prefix((uint8_t*) uuid128, uuid16); } else if (uuid_length == 16u){ reverse_128(uuid, uuid128); } else { return; } if (gatt_client->filter_with_uuid && (memcmp(gatt_client->uuid128, uuid128, 16) != 0)) return; gatt_client->characteristic_properties = properties; gatt_client->characteristic_start_handle = start_handle; gatt_client->attribute_handle = value_handle; if (gatt_client->filter_with_uuid) return; gatt_client->uuid16 = uuid16; (void)memcpy(gatt_client->uuid128, uuid128, 16); } static void report_gatt_characteristic_end_found(gatt_client_t * gatt_client, uint16_t end_handle){ // TODO: stop searching if filter and uuid found if (!gatt_client->characteristic_start_handle) return; emit_gatt_characteristic_query_result_event(gatt_client, gatt_client->characteristic_start_handle, gatt_client->attribute_handle, end_handle, gatt_client->characteristic_properties, gatt_client->uuid128); gatt_client->characteristic_start_handle = 0; } static void report_gatt_characteristics(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size){ if (size < 2u) return; uint8_t attr_length = packet[1]; if ((attr_length != 7u) && (attr_length != 21u)) return; uint8_t uuid_length = attr_length - 5u; int i; for (i = 2u; (i + attr_length) <= size; i += attr_length){ uint16_t start_handle = little_endian_read_16(packet, i); uint8_t properties = packet[i+2]; uint16_t value_handle = little_endian_read_16(packet, i+3); report_gatt_characteristic_end_found(gatt_client, start_handle - 1u); report_gatt_characteristic_start_found(gatt_client, start_handle, properties, value_handle, &packet[i + 5], uuid_length); } } static void report_gatt_included_service_uuid16(gatt_client_t * gatt_client, uint16_t include_handle, uint16_t uuid16){ uint8_t normalized_uuid128[16]; uuid_add_bluetooth_prefix(normalized_uuid128, uuid16); emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, gatt_client->query_end_handle, normalized_uuid128); } static void report_gatt_included_service_uuid128(gatt_client_t * gatt_client, uint16_t include_handle, const uint8_t * uuid128){ emit_gatt_included_service_query_result_event(gatt_client, include_handle, gatt_client->query_start_handle, gatt_client->query_end_handle, uuid128); } static void report_gatt_characteristic_value_change(gatt_client_t *gatt_client, uint8_t event_type, uint16_t value_handle, uint8_t *value, int length) { uint8_t * packet; // Single Characteristic listener, setup packet with service + connection id = 0 packet = setup_characteristic_value_packet(gatt_client, event_type, value_handle, value, length, 0, 0); btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_value_listeners); while (btstack_linked_list_iterator_has_next(&it)) { gatt_client_notification_t *notification = (gatt_client_notification_t *) btstack_linked_list_iterator_next(&it); if ((notification->con_handle != GATT_CLIENT_ANY_CONNECTION) && (notification->con_handle != gatt_client->con_handle)) continue; if ((notification->attribute_handle != GATT_CLIENT_ANY_VALUE_HANDLE) && (notification->attribute_handle != value_handle)) continue; (*notification->callback)(HCI_EVENT_PACKET, 0, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); } // Service characteristics btstack_linked_list_iterator_init(&it, &gatt_client_service_value_listeners); while (btstack_linked_list_iterator_has_next(&it)){ const gatt_client_service_notification_t * notification = (gatt_client_service_notification_t*) btstack_linked_list_iterator_next(&it); if (notification->con_handle != gatt_client->con_handle) continue; if (notification->start_group_handle > value_handle) continue; if (notification->end_group_handle < value_handle) continue; // (re)setup value packet with service and connection id (to avoid patching event later) packet = setup_characteristic_value_packet(gatt_client, event_type, value_handle, value, length, notification->service_id, notification->connection_id); (*notification->callback)(HCI_EVENT_PACKET, 0, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); } } // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes static void report_gatt_notification(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { if (!gatt_client_accept_server_message(gatt_client)) return; report_gatt_characteristic_value_change(gatt_client, GATT_EVENT_NOTIFICATION, value_handle, value, length); } // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes static void report_gatt_indication(gatt_client_t *gatt_client, uint16_t value_handle, uint8_t *value, int length) { if (!gatt_client_accept_server_message(gatt_client)) return; #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED // Directly Handle GATT Service Changed and Database Hash indications if (value_handle == gatt_client->gatt_service_database_hash_value_handle){ gatt_client_service_emit_database_hash(gatt_client, value, length); } if (value_handle == gatt_client->gatt_service_changed_value_handle){ gatt_client_service_emit_service_changed(gatt_client, value, length); } #endif report_gatt_characteristic_value_change(gatt_client, GATT_EVENT_INDICATION, value_handle, value, length); } // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes static void report_gatt_characteristic_value(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * value, uint16_t length){ uint8_t * packet = setup_characteristic_value_packet( gatt_client, GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value, length, gatt_client->service_id, gatt_client->connection_id); emit_event_new(gatt_client->callback, packet, CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE + length); } // @note assume that value is part of an l2cap buffer - overwrite parts of the HCI/L2CAP/ATT packet (4/4/3) bytes static void report_gatt_long_characteristic_value_blob(gatt_client_t * gatt_client, uint16_t attribute_handle, uint8_t * blob, uint16_t blob_length, int value_offset){ uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT, attribute_handle, value_offset, blob, blob_length); emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); } static void report_gatt_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *value, uint16_t value_length, uint16_t value_offset){ UNUSED(value_offset); uint8_t * packet = setup_characteristic_value_packet(gatt_client, GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, descriptor_handle, value, value_length, gatt_client->service_id, gatt_client->connection_id); emit_event_new(gatt_client->callback, packet, value_length + 8u); } static void report_gatt_long_characteristic_descriptor(gatt_client_t * gatt_client, uint16_t descriptor_handle, uint8_t *blob, uint16_t blob_length, uint16_t value_offset){ uint8_t * packet = setup_long_characteristic_value_packet(gatt_client, GATT_EVENT_LONG_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT, descriptor_handle, value_offset, blob, blob_length); emit_event_new(gatt_client->callback, packet, blob_length + LONG_CHARACTERISTIC_VALUE_EVENT_HEADER_SIZE); } static void report_gatt_all_characteristic_descriptors(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size, uint16_t pair_size){ int i; for (i = 0u; (i + pair_size) <= size; i += pair_size){ uint16_t descriptor_handle = little_endian_read_16(packet,i); uint8_t uuid128[16]; uint16_t uuid16 = 0; if (pair_size == 4u){ uuid16 = little_endian_read_16(packet,i+2); uuid_add_bluetooth_prefix(uuid128, uuid16); } else { reverse_128(&packet[i+2], uuid128); } emit_gatt_all_characteristic_descriptors_result_event(gatt_client, descriptor_handle, uuid128); } } static bool is_query_done(gatt_client_t * gatt_client, uint16_t last_result_handle){ return last_result_handle >= gatt_client->end_group_handle; } static void trigger_next_query(gatt_client_t * gatt_client, uint16_t last_result_handle, gatt_client_state_t next_query_state){ if (is_query_done(gatt_client, last_result_handle)){ gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); return; } // next gatt_client->start_group_handle = last_result_handle + 1u; gatt_client->state = next_query_state; } static void trigger_next_included_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_INCLUDED_SERVICE_QUERY); } static void trigger_next_service_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_QUERY); } static void trigger_next_service_by_uuid_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_SERVICE_WITH_UUID_QUERY); } static void trigger_next_characteristic_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ if (is_query_done(gatt_client, last_result_handle)){ // report last characteristic report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); } trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY); } static void trigger_next_characteristic_descriptor_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY); } static void trigger_next_read_by_type_query(gatt_client_t * gatt_client, uint16_t last_result_handle){ trigger_next_query(gatt_client, last_result_handle, P_W2_SEND_READ_BY_TYPE_REQUEST); } static void trigger_next_prepare_write_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, gatt_client_state_t done_state){ gatt_client->attribute_offset += write_blob_length(gatt_client); uint16_t next_blob_length = write_blob_length(gatt_client); if (next_blob_length == 0u){ gatt_client->state = done_state; return; } gatt_client->state = next_query_state; } static void trigger_next_blob_query(gatt_client_t * gatt_client, gatt_client_state_t next_query_state, uint16_t received_blob_length){ uint16_t max_blob_length = gatt_client->mtu - 1u; if (received_blob_length < max_blob_length){ gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); return; } gatt_client->attribute_offset += received_blob_length; gatt_client->state = next_query_state; } void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ notification->callback = callback; notification->con_handle = con_handle; if (characteristic == NULL){ notification->attribute_handle = GATT_CLIENT_ANY_VALUE_HANDLE; } else { notification->attribute_handle = characteristic->value_handle; } btstack_linked_list_add(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); } void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification){ btstack_linked_list_remove(&gatt_client_value_listeners, (btstack_linked_item_t*) notification); } void gatt_client_listen_for_service_characteristic_value_updates(gatt_client_service_notification_t * notification, btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, uint16_t service_id, uint16_t connection_id){ notification->callback = callback; notification->con_handle = con_handle; notification->start_group_handle = service->start_group_handle; notification->end_group_handle = service->end_group_handle; notification->service_id = service_id; notification->connection_id = connection_id; btstack_linked_list_add(&gatt_client_service_value_listeners, (btstack_linked_item_t*) notification); } /** * @brief Stop listening to characteristic value updates for registered service with * the gatt_client_listen_for_characteristic_value_updates function. * @param notification struct used in gatt_client_listen_for_characteristic_value_updates */ void gatt_client_stop_listening_for_service_characteristic_value_updates(gatt_client_service_notification_t * notification){ btstack_linked_list_remove(&gatt_client_service_value_listeners, (btstack_linked_item_t*) notification); } static bool is_value_valid(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size){ uint16_t attribute_handle = little_endian_read_16(packet, 1); uint16_t value_offset = little_endian_read_16(packet, 3); if (gatt_client->attribute_handle != attribute_handle) return false; if (gatt_client->attribute_offset != value_offset) return false; return memcmp(&gatt_client->attribute_value[gatt_client->attribute_offset], &packet[5], size - 5u) == 0u; } #ifdef ENABLE_LE_SIGNED_WRITE static void gatt_client_run_for_client_start_signed_write(gatt_client_t *gatt_client) { sm_key_t csrk; le_device_db_local_csrk_get(gatt_client->le_device_index, csrk); uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); gatt_client->state = P_W4_CMAC_RESULT; sm_cmac_signed_write_start(csrk, ATT_SIGNED_WRITE_COMMAND, gatt_client->attribute_handle, gatt_client->attribute_length, gatt_client->attribute_value, sign_counter, att_signed_write_handle_cmac_result); } #endif // returns true if packet was sent static bool gatt_client_run_for_gatt_client(gatt_client_t * gatt_client){ // wait until re-encryption is complete if (gap_reconnect_security_setup_active(gatt_client->con_handle)) return false; // wait until re-encryption is complete if (gatt_client->reencryption_active) return false; // wait until pairing complete (either reactive authentication or due to required security level) if (gatt_client->wait_for_authentication_complete) return false; bool client_request_pending = gatt_client->state != P_READY; // verify security level for Mandatory Authentication over LE bool check_security; switch (gatt_client->bearer_type){ case ATT_BEARER_UNENHANCED_LE: check_security = true; break; default: check_security = false; break; } if (client_request_pending && (gatt_client_required_security_level > gatt_client->security_level) && check_security){ log_info("Trigger pairing, current security level %u, required %u\n", gatt_client->security_level, gatt_client_required_security_level); gatt_client->wait_for_authentication_complete = true; // set att error code for pairing failure based on required level switch (gatt_client_required_security_level){ case LEVEL_4: case LEVEL_3: gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_AUTHENTICATION; break; default: gatt_client->pending_error_code = ATT_ERROR_INSUFFICIENT_ENCRYPTION; break; } sm_request_pairing(gatt_client->con_handle); // sm probably just sent a pdu return true; } switch (gatt_client->mtu_state) { case SEND_MTU_EXCHANGE: gatt_client->mtu_state = SENT_MTU_EXCHANGE; att_exchange_mtu_request(gatt_client); return true; case SENT_MTU_EXCHANGE: return false; default: break; } if (gatt_client->send_confirmation){ gatt_client->send_confirmation = false; att_confirmation(gatt_client); return true; } // check MTU for writes switch (gatt_client->state){ case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: if (gatt_client->attribute_length <= (gatt_client->mtu - 3u)) break; log_error("gatt_client_run: value len %u > MTU %u - 3\n", gatt_client->attribute_length,gatt_client->mtu); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH); return false; default: break; } bool packet_sent = true; bool done = true; switch (gatt_client->state){ case P_W2_SEND_SERVICE_QUERY: gatt_client->state = P_W4_SERVICE_QUERY_RESULT; send_gatt_services_request(gatt_client); break; case P_W2_SEND_SERVICE_WITH_UUID_QUERY: gatt_client->state = P_W4_SERVICE_WITH_UUID_RESULT; send_gatt_services_by_uuid_request(gatt_client); break; case P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY: gatt_client->state = P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT; send_gatt_characteristic_request(gatt_client); break; case P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY: gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; send_gatt_characteristic_request(gatt_client); break; case P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY: gatt_client->state = P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT; send_gatt_characteristic_descriptor_request(gatt_client); break; case P_W2_SEND_INCLUDED_SERVICE_QUERY: gatt_client->state = P_W4_INCLUDED_SERVICE_QUERY_RESULT; send_gatt_included_service_request(gatt_client); break; case P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY: gatt_client->state = P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT; send_gatt_included_service_uuid_request(gatt_client); break; case P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY: gatt_client->state = P_W4_READ_CHARACTERISTIC_VALUE_RESULT; send_gatt_read_characteristic_value_request(gatt_client); break; case P_W2_SEND_READ_BLOB_QUERY: gatt_client->state = P_W4_READ_BLOB_RESULT; send_gatt_read_blob_request(gatt_client); break; case P_W2_SEND_READ_BY_TYPE_REQUEST: gatt_client->state = P_W4_READ_BY_TYPE_RESPONSE; send_gatt_read_by_type_request(gatt_client); break; case P_W2_SEND_READ_MULTIPLE_REQUEST: gatt_client->state = P_W4_READ_MULTIPLE_RESPONSE; send_gatt_read_multiple_request(gatt_client); break; #ifdef ENABLE_GATT_OVER_EATT case P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST: gatt_client->state = P_W4_READ_MULTIPLE_VARIABLE_RESPONSE; send_gatt_read_multiple_variable_request(gatt_client); break; #endif case P_W2_SEND_WRITE_CHARACTERISTIC_VALUE: gatt_client->state = P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT; send_gatt_write_attribute_value_request(gatt_client); break; case P_W2_PREPARE_WRITE: gatt_client->state = P_W4_PREPARE_WRITE_RESULT; send_gatt_prepare_write_request(gatt_client); break; case P_W2_PREPARE_WRITE_SINGLE: gatt_client->state = P_W4_PREPARE_WRITE_SINGLE_RESULT; send_gatt_prepare_write_request(gatt_client); break; case P_W2_PREPARE_RELIABLE_WRITE: gatt_client->state = P_W4_PREPARE_RELIABLE_WRITE_RESULT; send_gatt_prepare_write_request(gatt_client); break; case P_W2_EXECUTE_PREPARED_WRITE: gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_RESULT; send_gatt_execute_write_request(gatt_client); break; case P_W2_CANCEL_PREPARED_WRITE: gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_RESULT; send_gatt_cancel_prepared_write_request(gatt_client); break; case P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH: gatt_client->state = P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT; send_gatt_cancel_prepared_write_request(gatt_client); break; #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY case P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: // use Find Information gatt_client->state = P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; send_gatt_characteristic_descriptor_request(gatt_client); #else case P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY: // Use Read By Type gatt_client->state = P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT; send_gatt_read_client_characteristic_configuration_request(gatt_client); #endif break; case P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY: gatt_client->state = P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT; send_gatt_read_characteristic_descriptor_request(gatt_client); break; case P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY: gatt_client->state = P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT; send_gatt_read_blob_request(gatt_client); break; case P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR: gatt_client->state = P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; send_gatt_write_attribute_value_request(gatt_client); break; case P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION: gatt_client->state = P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT; send_gatt_write_client_characteristic_configuration_request(gatt_client); break; case P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR: gatt_client->state = P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; send_gatt_prepare_write_request(gatt_client); break; case P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR: gatt_client->state = P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT; send_gatt_execute_write_request(gatt_client); break; #ifdef ENABLE_LE_SIGNED_WRITE case P_W4_IDENTITY_RESOLVING: log_info("P_W4_IDENTITY_RESOLVING - state %x", sm_identity_resolving_state(gatt_client->con_handle)); switch (sm_identity_resolving_state(gatt_client->con_handle)){ case IRK_LOOKUP_SUCCEEDED: gatt_client->le_device_index = sm_le_device_index(gatt_client->con_handle); gatt_client->state = P_W4_CMAC_READY; if (sm_cmac_ready()){ gatt_client_run_for_client_start_signed_write(gatt_client); } break; case IRK_LOOKUP_FAILED: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); break; default: break; } packet_sent = false; break; case P_W4_CMAC_READY: if (sm_cmac_ready()){ gatt_client_run_for_client_start_signed_write(gatt_client); } packet_sent = false; break; case P_W2_SEND_SIGNED_WRITE: { gatt_client->state = P_W4_SEND_SIGNED_WRITE_DONE; // bump local signing counter uint32_t sign_counter = le_device_db_local_counter_get(gatt_client->le_device_index); le_device_db_local_counter_set(gatt_client->le_device_index, sign_counter + 1); // send signed write command send_gatt_signed_write_request(gatt_client, sign_counter); // finally, notifiy client that write is complete gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; } #endif default: done = false; break; } if (done){ return packet_sent; } // write without response callback btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&gatt_client->write_without_response_requests); if (callback != NULL){ (*callback->callback)(callback->context); return true; } // requested can send now old if (gatt_client->write_without_response_callback != NULL){ btstack_packet_handler_t packet_handler = gatt_client->write_without_response_callback; gatt_client->write_without_response_callback = NULL; uint8_t event[4]; event[0] = GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE; event[1] = sizeof(event) - 2u; little_endian_store_16(event, 2, gatt_client->con_handle); packet_handler(HCI_EVENT_PACKET, gatt_client->con_handle, event, sizeof(event)); return true; // to trigger requeueing (even if higher layer didn't sent) } return false; } static void gatt_client_run(void){ btstack_linked_item_t *it; bool packet_sent; #ifdef ENABLE_GATT_OVER_EATT btstack_linked_list_iterator_t it_eatt; #endif for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ gatt_client_t * gatt_client = (gatt_client_t *) it; switch (gatt_client->bearer_type){ case ATT_BEARER_UNENHANCED_LE: #ifdef ENABLE_GATT_OVER_EATT btstack_linked_list_iterator_init(&it_eatt, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it_eatt)) { gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it_eatt); if (eatt_client->state != P_READY){ if (att_dispatch_client_can_send_now(gatt_client->con_handle)){ gatt_client_run_for_gatt_client(eatt_client); } } } #endif if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) { att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); return; } packet_sent = gatt_client_run_for_gatt_client(gatt_client); if (packet_sent){ // request new permission att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); // requeue client for fairness and exit // note: iterator has become invalid btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); return; } break; #ifdef ENABLE_GATT_OVER_CLASSIC case ATT_BEARER_UNENHANCED_CLASSIC: if (gatt_client->con_handle == HCI_CON_HANDLE_INVALID) { continue; } // handle GATT over BR/EDR if (att_dispatch_client_can_send_now(gatt_client->con_handle) == false) { att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); return; } packet_sent = gatt_client_run_for_gatt_client(gatt_client); if (packet_sent){ // request new permission att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); // requeue client for fairness and exit // note: iterator has become invalid btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); btstack_linked_list_add_tail(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); return; } break; #endif default: btstack_unreachable(); break; } } } // emit complete event, used to avoid emitting event from API call static void gatt_client_emit_events(void * context){ UNUSED(context); btstack_linked_item_t *it; for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next) { gatt_client_t *gatt_client = (gatt_client_t *) it; if (gatt_client->state == P_W2_EMIT_QUERY_COMPLETE_EVENT){ gatt_client->state = P_READY; emit_gatt_complete_event(gatt_client, ATT_ERROR_SUCCESS); } } } static void gatt_client_report_error_if_pending(gatt_client_t *gatt_client, uint8_t att_error_code) { if (is_ready(gatt_client)) return; gatt_client_handle_transaction_complete(gatt_client, att_error_code); } static void gatt_client_handle_reencryption_complete(const uint8_t * packet){ hci_con_handle_t con_handle = sm_event_reencryption_complete_get_handle(packet); gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client == NULL) return; // update security level gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); gatt_client->reencryption_result = sm_event_reencryption_complete_get_status(packet); gatt_client->reencryption_active = false; gatt_client->wait_for_authentication_complete = false; if (gatt_client->state == P_READY) return; switch (sm_event_reencryption_complete_get_status(packet)){ case ERROR_CODE_SUCCESS: log_info("re-encryption success, retry operation"); break; case ERROR_CODE_AUTHENTICATION_FAILURE: case ERROR_CODE_PIN_OR_KEY_MISSING: #if defined(ENABLE_GATT_CLIENT_PAIRING) && !defined(ENABLE_LE_PROACTIVE_AUTHENTICATION) if (gatt_client_required_security_level == LEVEL_0) { // re-encryption failed for reactive authentication with pairing and we have a pending client request // => try to resolve it by deleting bonding information if we started pairing before // delete bonding information int le_device_db_index = sm_le_device_index(gatt_client->con_handle); btstack_assert(le_device_db_index >= 0); log_info("reactive auth with pairing: delete bonding and start pairing"); #ifdef ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION hci_remove_le_device_db_entry_from_resolving_list((uint16_t) le_device_db_index); #endif le_device_db_remove(le_device_db_index); // trigger pairing again sm_request_pairing(gatt_client->con_handle); break; } #endif // report bonding information missing gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_BONDING_INFORMATION_MISSING); break; default: // report bonding information missing gatt_client_handle_transaction_complete(gatt_client, gatt_client->pending_error_code); break; } } static void gatt_client_handle_disconnection_complete(const uint8_t * packet){ log_info("GATT Client: HCI_EVENT_DISCONNECTION_COMPLETE"); hci_con_handle_t con_handle = little_endian_read_16(packet,3); gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client == NULL) return; gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); gatt_client_timeout_stop(gatt_client); btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); btstack_memory_gatt_client_free(gatt_client); } static void gatt_client_event_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); // ok: handling own l2cap events UNUSED(size); // ok: there is no channel if (packet_type != HCI_EVENT_PACKET) return; hci_con_handle_t con_handle; gatt_client_t * gatt_client; switch (hci_event_packet_get_type(packet)) { case HCI_EVENT_DISCONNECTION_COMPLETE: gatt_client_handle_disconnection_complete(packet); break; // Pairing complete (with/without bonding=storing of pairing information) case SM_EVENT_PAIRING_COMPLETE: con_handle = sm_event_pairing_complete_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client == NULL) break; // update security level gatt_client->security_level = gatt_client_le_security_level_for_connection(con_handle); if (gatt_client->wait_for_authentication_complete){ gatt_client->wait_for_authentication_complete = false; if (sm_event_pairing_complete_get_status(packet) != ERROR_CODE_SUCCESS){ log_info("pairing failed, report previous error 0x%x", gatt_client->pending_error_code); gatt_client_report_error_if_pending(gatt_client, gatt_client->pending_error_code); } else { log_info("pairing success, retry operation"); } } break; #ifdef ENABLE_LE_SIGNED_WRITE // Identity Resolving completed (no code, gatt_client_run will continue) case SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED: case SM_EVENT_IDENTITY_RESOLVING_FAILED: break; #endif // re-encryption started case SM_EVENT_REENCRYPTION_STARTED: con_handle = sm_event_reencryption_complete_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client == NULL) break; gatt_client->reencryption_active = true; gatt_client->reencryption_result = ERROR_CODE_SUCCESS; break; // re-encryption complete case SM_EVENT_REENCRYPTION_COMPLETE: gatt_client_handle_reencryption_complete(packet); break; default: break; } gatt_client_run(); } static void gatt_client_handle_att_read_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { switch (gatt_client->state) { case P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT: if (size >= 17) { uint8_t uuid128[16]; reverse_128(&packet[1], uuid128); report_gatt_included_service_uuid128(gatt_client, gatt_client->start_group_handle, uuid128); } trigger_next_included_service_query(gatt_client, gatt_client->start_group_handle); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: report_gatt_characteristic_value(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: report_gatt_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u, 0u); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; // Use ATT_READ_REQUEST for first blob of Read Long Characteristic case P_W4_READ_BLOB_RESULT: report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u, gatt_client->attribute_offset); trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, size - 1u); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; // Use ATT_READ_REQUEST for first blob of Read Long Characteristic Descriptor case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], size - 1u, gatt_client->attribute_offset); trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, size - 1u); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; default: break; } } static void gatt_client_handle_att_read_by_type_response(gatt_client_t *gatt_client, uint8_t *packet, uint16_t size) { switch (gatt_client->state) { case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: report_gatt_characteristics(gatt_client, packet, size); trigger_next_characteristic_query(gatt_client, get_last_result_handle_from_characteristics_list(packet, size)); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR break; case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: report_gatt_characteristics(gatt_client, packet, size); trigger_next_characteristic_query(gatt_client, get_last_result_handle_from_characteristics_list(packet, size)); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done, or by ATT_ERROR break; case P_W4_INCLUDED_SERVICE_QUERY_RESULT: { if (size < 2u) break; uint16_t uuid16 = 0; uint16_t pair_size = packet[1]; if (pair_size == 6u) { if (size < 8u) break; // UUIDs not available, query first included service gatt_client->start_group_handle = little_endian_read_16(packet, 2); // ready for next query gatt_client->query_start_handle = little_endian_read_16(packet, 4); gatt_client->query_end_handle = little_endian_read_16(packet, 6); gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY; break; } if (pair_size != 8u) break; // UUIDs included, report all of them uint16_t offset; for (offset = 2u; (offset + 8u) <= size; offset += pair_size) { uint16_t include_handle = little_endian_read_16(packet, offset); gatt_client->query_start_handle = little_endian_read_16(packet, offset + 2u); gatt_client->query_end_handle = little_endian_read_16(packet, offset + 4u); uuid16 = little_endian_read_16(packet, offset + 6u); report_gatt_included_service_uuid16(gatt_client, include_handle, uuid16); } trigger_next_included_service_query(gatt_client, get_last_result_handle_from_included_services_list(packet, size)); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } #ifndef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY case P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT: gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, 2); gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; break; #endif case P_W4_READ_BY_TYPE_RESPONSE: { uint16_t pair_size = packet[1]; // set last result handle to last valid handle, only used if pair_size invalid uint16_t last_result_handle = 0xffff; if (pair_size > 2) { uint16_t offset; for (offset = 2; offset < size; offset += pair_size) { uint16_t value_handle = little_endian_read_16(packet, offset); report_gatt_characteristic_value(gatt_client, value_handle, &packet[offset + 2u], pair_size - 2u); last_result_handle = value_handle; } } trigger_next_read_by_type_query(gatt_client, last_result_handle); break; } default: break; } } static void gatt_client_handle_att_write_response(gatt_client_t *gatt_client) { switch (gatt_client->state) { case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; default: break; } } static void gatt_client_handle_att_response(gatt_client_t * gatt_client, uint8_t * packet, uint16_t size) { uint8_t att_status; switch (packet[0]) { case ATT_EXCHANGE_MTU_RESPONSE: { if (size < 3u) break; bool update_gatt_server_att_mtu = false; uint16_t remote_rx_mtu = little_endian_read_16(packet, 1); uint16_t local_rx_mtu = l2cap_max_le_mtu(); switch (gatt_client->bearer_type){ case ATT_BEARER_UNENHANCED_LE: update_gatt_server_att_mtu = true; break; #ifdef ENABLE_GATT_OVER_CLASSIC case ATT_BEARER_UNENHANCED_CLASSIC: local_rx_mtu = gatt_client->mtu; break; #endif default: btstack_unreachable(); break; } uint16_t mtu = (remote_rx_mtu < local_rx_mtu) ? remote_rx_mtu : local_rx_mtu; // set gatt client mtu gatt_client->mtu = mtu; gatt_client->mtu_state = MTU_EXCHANGED; if (update_gatt_server_att_mtu){ // set per connection mtu state - for fixed channel hci_connection_t *hci_connection = hci_connection_for_handle(gatt_client->con_handle); hci_connection->att_connection.mtu = gatt_client->mtu; hci_connection->att_connection.mtu_exchanged = true; } emit_gatt_mtu_exchanged_result_event(gatt_client, gatt_client->mtu); break; } case ATT_READ_BY_GROUP_TYPE_RESPONSE: switch (gatt_client->state) { case P_W4_SERVICE_QUERY_RESULT: report_gatt_services(gatt_client, packet, size); trigger_next_service_query(gatt_client, get_last_result_handle_from_service_list(packet, size)); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; default: break; } break; case ATT_HANDLE_VALUE_NOTIFICATION: if (size < 3u) return; report_gatt_notification(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); return; #ifdef ENABLE_GATT_OVER_EATT case ATT_MULTIPLE_HANDLE_VALUE_NTF: if (size >= 5u) { uint16_t offset = 1; while (true){ uint16_t value_handle = little_endian_read_16(packet, offset); offset += 2; uint16_t value_length = little_endian_read_16(packet, offset); offset += 2; if ((offset + value_length) > size) break; report_gatt_notification(gatt_client, value_handle, &packet[offset], value_length); offset += value_length; } } return; #endif case ATT_HANDLE_VALUE_INDICATION: if (size < 3u) break; report_gatt_indication(gatt_client, little_endian_read_16(packet, 1u), &packet[3], size - 3u); gatt_client->send_confirmation = true; break; case ATT_READ_BY_TYPE_RESPONSE: gatt_client_handle_att_read_by_type_response(gatt_client, packet, size); break; case ATT_READ_RESPONSE: gatt_client_handle_att_read_response(gatt_client, packet, size); break; case ATT_FIND_BY_TYPE_VALUE_RESPONSE: { uint8_t pair_size = 4; int i; uint16_t start_group_handle; uint16_t end_group_handle = 0xffff; // asserts GATT_EVENT_QUERY_COMPLETE is emitted if no results for (i = 1u; (i + pair_size) <= size; i += pair_size) { start_group_handle = little_endian_read_16(packet, i); end_group_handle = little_endian_read_16(packet, i + 2); emit_gatt_service_query_result_event(gatt_client, start_group_handle, end_group_handle, gatt_client->uuid128); } trigger_next_service_by_uuid_query(gatt_client, end_group_handle); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } case ATT_FIND_INFORMATION_REPLY: { if (size < 2u) break; uint8_t pair_size = 4; if (packet[1u] == 2u) { pair_size = 18; } uint16_t offset = 2; if (size < (pair_size + offset)) break; uint16_t last_descriptor_handle = little_endian_read_16(packet, size - pair_size); #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY log_info("ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY, state %x", gatt_client->state); if (gatt_client->state == P_W4_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT){ // iterate over descriptors looking for CCC if (pair_size == 4){ while ((offset + 4) <= size){ uint16_t uuid16 = little_endian_read_16(packet, offset + 2); if (uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION){ gatt_client->client_characteristic_configuration_handle = little_endian_read_16(packet, offset); gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; log_info("CCC found %x", gatt_client->client_characteristic_configuration_handle); break; } offset += pair_size; } } if (is_query_done(gatt_client, last_descriptor_handle)){ } else { // next gatt_client->start_group_handle = last_descriptor_handle + 1; gatt_client->state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; } break; } #endif report_gatt_all_characteristic_descriptors(gatt_client, &packet[2], size - 2u, pair_size); trigger_next_characteristic_descriptor_query(gatt_client, last_descriptor_handle); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } case ATT_WRITE_RESPONSE: gatt_client_handle_att_write_response(gatt_client); break; case ATT_READ_BLOB_RESPONSE: { uint16_t received_blob_length = size - 1u; switch (gatt_client->state) { case P_W4_READ_BLOB_RESULT: report_gatt_long_characteristic_value_blob(gatt_client, gatt_client->attribute_handle, &packet[1], received_blob_length, gatt_client->attribute_offset); trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_QUERY, received_blob_length); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: report_gatt_long_characteristic_descriptor(gatt_client, gatt_client->attribute_handle, &packet[1], received_blob_length, gatt_client->attribute_offset); trigger_next_blob_query(gatt_client, P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, received_blob_length); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; default: break; } break; } case ATT_PREPARE_WRITE_RESPONSE: switch (gatt_client->state) { case P_W4_PREPARE_WRITE_SINGLE_RESULT: if (is_value_valid(gatt_client, packet, size)) { att_status = ATT_ERROR_SUCCESS; } else { att_status = ATT_ERROR_DATA_MISMATCH; } gatt_client_handle_transaction_complete(gatt_client, att_status); break; case P_W4_PREPARE_WRITE_RESULT: { gatt_client->attribute_offset = little_endian_read_16(packet, 3); trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: { gatt_client->attribute_offset = little_endian_read_16(packet, 3); trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } case P_W4_PREPARE_RELIABLE_WRITE_RESULT: { if (is_value_valid(gatt_client, packet, size)) { gatt_client->attribute_offset = little_endian_read_16(packet, 3); trigger_next_prepare_write_query(gatt_client, P_W2_PREPARE_RELIABLE_WRITE, P_W2_EXECUTE_PREPARED_WRITE); // GATT_EVENT_QUERY_COMPLETE is emitted by trigger_next_xxx when done break; } gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; break; } default: break; } break; case ATT_EXECUTE_WRITE_RESPONSE: switch (gatt_client->state) { case P_W4_EXECUTE_PREPARED_WRITE_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_CANCEL_PREPARED_WRITE_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_DATA_MISMATCH); break; case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; default: break; } break; case ATT_READ_MULTIPLE_RESPONSE: switch (gatt_client->state) { case P_W4_READ_MULTIPLE_RESPONSE: report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; default: break; } break; #ifdef ENABLE_GATT_OVER_EATT case ATT_READ_MULTIPLE_VARIABLE_RSP: switch (gatt_client->state) { case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: report_gatt_characteristic_value(gatt_client, 0u, &packet[1], size - 1u); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; default: break; } break; #endif case ATT_ERROR_RESPONSE: if (size < 5u) return; att_status = packet[4]; switch (att_status) { case ATT_ERROR_ATTRIBUTE_NOT_FOUND: { switch (gatt_client->state) { case P_W4_SERVICE_QUERY_RESULT: case P_W4_SERVICE_WITH_UUID_RESULT: case P_W4_INCLUDED_SERVICE_QUERY_RESULT: case P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT: gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT: case P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT: report_gatt_characteristic_end_found(gatt_client, gatt_client->end_group_handle); gatt_client_handle_transaction_complete(gatt_client, ATT_ERROR_SUCCESS); break; case P_W4_READ_BY_TYPE_RESPONSE: if (gatt_client->start_group_handle == gatt_client->query_start_handle) { att_status = ATT_ERROR_ATTRIBUTE_NOT_FOUND; } else { att_status = ATT_ERROR_SUCCESS; } gatt_client_handle_transaction_complete(gatt_client, att_status); break; default: gatt_client_report_error_if_pending(gatt_client, att_status); break; } break; } #ifdef ENABLE_GATT_CLIENT_PAIRING case ATT_ERROR_INSUFFICIENT_AUTHENTICATION: case ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE: case ATT_ERROR_INSUFFICIENT_ENCRYPTION: { // security too low if (gatt_client->security_counter > 0) { gatt_client_report_error_if_pending(gatt_client, att_status); break; } // start security gatt_client->security_counter++; // setup action int retry = 1; switch (gatt_client->state){ case P_W4_READ_CHARACTERISTIC_VALUE_RESULT: gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY ; break; case P_W4_READ_BLOB_RESULT: gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; break; case P_W4_READ_BY_TYPE_RESPONSE: gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; break; case P_W4_READ_MULTIPLE_RESPONSE: gatt_client->state = P_W2_SEND_READ_MULTIPLE_REQUEST; break; case P_W4_READ_MULTIPLE_VARIABLE_RESPONSE: gatt_client->state = P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST; break; case P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT: gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; break; case P_W4_PREPARE_WRITE_RESULT: gatt_client->state = P_W2_PREPARE_WRITE; break; case P_W4_PREPARE_WRITE_SINGLE_RESULT: gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; break; case P_W4_PREPARE_RELIABLE_WRITE_RESULT: gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; break; case P_W4_EXECUTE_PREPARED_WRITE_RESULT: gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; break; case P_W4_CANCEL_PREPARED_WRITE_RESULT: gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; break; case P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT: gatt_client->state = P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH; break; case P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; break; case P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; break; case P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; break; case P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT: gatt_client->state = P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION; break; case P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; break; case P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT: gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR; break; #ifdef ENABLE_LE_SIGNED_WRITE case P_W4_SEND_SIGNED_WRITE_DONE: gatt_client->state = P_W2_SEND_SIGNED_WRITE; break; #endif default: log_info("retry not supported for state %x", gatt_client->state); retry = 0; break; } if (!retry) { gatt_client_report_error_if_pending(gatt_client, att_status); break; } log_info("security error, start pairing"); // start pairing for higher security level gatt_client->wait_for_authentication_complete = true; gatt_client->pending_error_code = att_status; sm_request_pairing(gatt_client->con_handle); break; } #endif // nothing we can do about that case ATT_ERROR_INSUFFICIENT_AUTHORIZATION: default: gatt_client_report_error_if_pending(gatt_client, att_status); break; } break; default: log_info("ATT Handler, unhandled response type 0x%02x", packet[0]); break; } } static void gatt_client_att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size) { gatt_client_t *gatt_client; #ifdef ENABLE_GATT_OVER_CLASSIC uint8_t status; hci_connection_t * hci_connection; hci_con_handle_t con_handle; #endif if (size < 1u) return; switch (packet_type){ case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)) { #ifdef ENABLE_GATT_OVER_CLASSIC case L2CAP_EVENT_CHANNEL_OPENED: status = l2cap_event_channel_opened_get_status(packet); gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_opened_get_local_cid(packet)); if (gatt_client != NULL){ con_handle = l2cap_event_channel_opened_get_handle(packet); hci_connection = hci_connection_for_handle(con_handle); if (status == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES){ if ((hci_connection != NULL) && hci_connection->att_server.incoming_connection_request) { log_info("Collision, retry in 100ms"); gatt_client->state = P_W2_L2CAP_CONNECT; // set timer for retry btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_classic_retry); btstack_run_loop_add_timer(&gatt_client->gc_timeout); break; } } // if status != 0, gatt_client will be discarded gatt_client->state = P_READY; gatt_client->con_handle = l2cap_event_channel_opened_get_handle(packet); gatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); gatt_client_classic_handle_connected(gatt_client, status); } break; case L2CAP_EVENT_CHANNEL_CLOSED: gatt_client = gatt_client_get_context_for_l2cap_cid(l2cap_event_channel_closed_get_local_cid(packet)); if (gatt_client != NULL){ // discard gatt client object gatt_client_classic_handle_disconnected(gatt_client); } break; #endif case L2CAP_EVENT_CAN_SEND_NOW: gatt_client_run(); break; // att_server has negotiated the mtu for this connection, cache if context exists case ATT_EVENT_MTU_EXCHANGE_COMPLETE: if (size < 6u) break; gatt_client = gatt_client_get_context_for_handle(handle); if (gatt_client != NULL) { gatt_client->mtu = little_endian_read_16(packet, 4); } break; default: break; } break; case ATT_DATA_PACKET: // special cases: notifications & indications motivate creating context switch (packet[0]) { case ATT_HANDLE_VALUE_NOTIFICATION: case ATT_HANDLE_VALUE_INDICATION: gatt_client_provide_context_for_handle(handle, &gatt_client); break; default: gatt_client = gatt_client_get_context_for_handle(handle); break; } if (gatt_client != NULL) { gatt_client_handle_att_response(gatt_client, packet, size); gatt_client_run(); } break; #ifdef ENABLE_GATT_OVER_CLASSIC case L2CAP_DATA_PACKET: gatt_client = gatt_client_get_context_for_l2cap_cid(handle); if (gatt_client != NULL){ gatt_client_handle_att_response(gatt_client, packet, size); gatt_client_run(); } break; #endif default: break; } } #ifdef ENABLE_LE_SIGNED_WRITE static void att_signed_write_handle_cmac_result(uint8_t hash[8]){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_connections); while (btstack_linked_list_iterator_has_next(&it)){ gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (gatt_client->state == P_W4_CMAC_RESULT){ // store result (void)memcpy(gatt_client->cmac, hash, 8); // reverse_64(hash, gatt_client->cmac); gatt_client->state = P_W2_SEND_SIGNED_WRITE; gatt_client_run(); return; } } } uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t message_len, uint8_t * message){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } if (is_ready(gatt_client) == 0){ return GATT_CLIENT_IN_WRONG_STATE; } gatt_client->callback = callback; gatt_client->attribute_handle = value_handle; gatt_client->attribute_length = message_len; gatt_client->attribute_value = message; gatt_client->state = P_W4_IDENTITY_RESOLVING; gatt_client_run(); return ERROR_CODE_SUCCESS; } #endif uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = 0x0001; gatt_client->end_group_handle = 0xffff; gatt_client->state = P_W2_SEND_SERVICE_QUERY; gatt_client->uuid16 = GATT_PRIMARY_SERVICE_UUID; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_secondary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = 0x0001; gatt_client->end_group_handle = 0xffff; gatt_client->state = P_W2_SEND_SERVICE_QUERY; gatt_client->uuid16 = GATT_SECONDARY_SERVICE_UUID; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_primary_services_by_uuid16_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->start_group_handle = 0x0001; gatt_client->end_group_handle = 0xffff; gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; gatt_client->uuid16 = uuid16; uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), gatt_client->uuid16); gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16){ return gatt_client_discover_primary_services_by_uuid16_with_context(callback, con_handle, uuid16, 0, 0); } uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid128){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = 0x0001; gatt_client->end_group_handle = 0xffff; gatt_client->uuid16 = 0; (void)memcpy(gatt_client->uuid128, uuid128, 16); gatt_client->state = P_W2_SEND_SERVICE_WITH_UUID_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_characteristics_for_service_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->start_group_handle = service->start_group_handle; gatt_client->end_group_handle = service->end_group_handle; gatt_client->filter_with_uuid = false; gatt_client->characteristic_start_handle = 0; gatt_client->state = P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service){ return gatt_client_discover_characteristics_for_service_with_context(callback, con_handle, service, 0, 0); } uint8_t gatt_client_find_included_services_for_service_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->start_group_handle = service->start_group_handle; gatt_client->end_group_handle = service->end_group_handle; gatt_client->state = P_W2_SEND_INCLUDED_SERVICE_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_find_included_services_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service) { return gatt_client_find_included_services_for_service_with_context(callback, con_handle, service, 0, 0); } uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = start_handle; gatt_client->end_group_handle = end_handle; gatt_client->filter_with_uuid = true; gatt_client->uuid16 = uuid16; uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); gatt_client->characteristic_start_handle = 0; gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = start_handle; gatt_client->end_group_handle = end_handle; gatt_client->filter_with_uuid = true; gatt_client->uuid16 = 0; (void)memcpy(gatt_client->uuid128, uuid128, 16); gatt_client->characteristic_start_handle = 0; gatt_client->state = P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_characteristics_for_service_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, uint16_t uuid16){ return gatt_client_discover_characteristics_for_handle_range_by_uuid16(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid16); } uint8_t gatt_client_discover_characteristics_for_service_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t * service, const uint8_t * uuid128){ return gatt_client_discover_characteristics_for_handle_range_by_uuid128(callback, con_handle, service->start_group_handle, service->end_group_handle, uuid128); } uint8_t gatt_client_discover_characteristic_descriptors_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; // check if there is space for characteristics descriptors if (characteristic->end_handle > characteristic->value_handle){ gatt_client->callback = callback; gatt_client->start_group_handle = characteristic->value_handle + 1u; gatt_client->end_group_handle = characteristic->end_handle; gatt_client->state = P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY; gatt_client_run(); } else { // schedule gatt complete event on next run loop iteration otherwise gatt_client->state = P_W2_EMIT_QUERY_COMPLETE_EVENT; gatt_client_deferred_event_emit.callback = gatt_client_emit_events; btstack_run_loop_execute_on_main_thread(&gatt_client_deferred_event_emit); } return ERROR_CODE_SUCCESS; } uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ return gatt_client_discover_characteristic_descriptors_with_context(callback, con_handle, characteristic, 0, 0); } uint8_t gatt_client_read_value_of_characteristic_using_value_handle_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t service_id, uint16_t connection_id) { gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->attribute_handle = value_handle; gatt_client->attribute_offset = 0; gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle){ return gatt_client_read_value_of_characteristic_using_value_handle_with_context(callback, con_handle, value_handle, 0, 0); } uint8_t gatt_client_read_value_of_characteristics_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = start_handle; gatt_client->end_group_handle = end_handle; gatt_client->query_start_handle = start_handle; gatt_client->query_end_handle = end_handle; gatt_client->uuid16 = uuid16; uuid_add_bluetooth_prefix((uint8_t*) &(gatt_client->uuid128), uuid16); gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_value_of_characteristics_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->start_group_handle = start_handle; gatt_client->end_group_handle = end_handle; gatt_client->query_start_handle = start_handle; gatt_client->query_end_handle = end_handle; gatt_client->uuid16 = 0; (void)memcpy(gatt_client->uuid128, uuid128, 16); gatt_client->state = P_W2_SEND_READ_BY_TYPE_REQUEST; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ return gatt_client_read_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); } uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t offset){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = value_handle; gatt_client->attribute_offset = offset; gatt_client->state = P_W2_SEND_READ_BLOB_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t service_id, uint16_t connection_id){ // TODO: move into gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset once // gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset_and_context exists gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; return gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(callback, con_handle, value_handle, 0); } uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle){ return gatt_client_read_long_value_of_characteristic_using_value_handle_with_context(callback, con_handle, value_handle, 0, 0); } uint8_t gatt_client_read_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic){ return gatt_client_read_long_value_of_characteristic_using_value_handle(callback, con_handle, characteristic->value_handle); } static uint8_t gatt_client_read_multiple_characteristic_values_with_state(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles, gatt_client_state_t state){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->read_multiple_handle_count = num_value_handles; gatt_client->read_multiple_handles = value_handles; gatt_client->state = state; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_multiple_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles){ return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_REQUEST); } #ifdef ENABLE_GATT_OVER_EATT uint8_t gatt_client_read_multiple_variable_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles){ return gatt_client_read_multiple_characteristic_values_with_state(callback, con_handle, num_value_handles, value_handles, P_W2_SEND_READ_MULTIPLE_VARIABLE_REQUEST); } #endif uint8_t gatt_client_write_value_of_characteristic_without_response(hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } if (value_length > (gatt_client->mtu - 3u)) return GATT_CLIENT_VALUE_TOO_LONG; if (!att_dispatch_client_can_send_now(gatt_client->con_handle)) return GATT_CLIENT_BUSY; return att_write_request(gatt_client, ATT_WRITE_COMMAND, value_handle, value_length, value); } uint8_t gatt_client_write_value_of_characteristic_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->attribute_handle = value_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_value = value; gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_VALUE; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value) { return gatt_client_write_value_of_characteristic_with_context(callback, con_handle, value_handle, value_length, value, 0, 0); } uint8_t gatt_client_write_long_value_of_characteristic_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t offset, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = value_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_offset = offset; gatt_client->attribute_value = value; gatt_client->state = P_W2_PREPARE_WRITE; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_long_value_of_characteristic_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value, uint16_t service_id, uint16_t connection_id){ // TODO: move into gatt_client_write_long_value_of_characteristic_with_offset once gatt_client_write_long_value_of_characteristic_with_offset_with_context exists gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; return gatt_client_write_long_value_of_characteristic_with_offset(callback, con_handle, value_handle, 0, value_length, value); } uint8_t gatt_client_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ return gatt_client_write_long_value_of_characteristic_with_context(callback, con_handle, value_handle, value_length, value, 0, 0); } uint8_t gatt_client_reliable_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t value_handle, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = value_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_offset = 0; gatt_client->attribute_value = value; gatt_client->state = P_W2_PREPARE_RELIABLE_WRITE; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_client_characteristic_configuration_with_context(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic, uint16_t configuration, uint16_t service_id, uint16_t connection_id){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } if (configuration > 3){ return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; } if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION) && ((characteristic->properties & ATT_PROPERTY_NOTIFY) == 0u)) { log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED"); return GATT_CLIENT_CHARACTERISTIC_NOTIFICATION_NOT_SUPPORTED; } else if ( (configuration & GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION) && ((characteristic->properties & ATT_PROPERTY_INDICATE) == 0u)){ log_info("gatt_client_write_client_characteristic_configuration: GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED"); return GATT_CLIENT_CHARACTERISTIC_INDICATION_NOT_SUPPORTED; } gatt_client->callback = callback; gatt_client->service_id = service_id; gatt_client->connection_id = connection_id; gatt_client->start_group_handle = characteristic->value_handle; gatt_client->end_group_handle = characteristic->end_handle; little_endian_store_16(gatt_client->client_characteristic_configuration_value, 0, configuration); #ifdef ENABLE_GATT_FIND_INFORMATION_FOR_CCC_DISCOVERY gatt_client->state = P_W2_SEND_FIND_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; #else gatt_client->state = P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY; #endif gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_client_characteristic_configuration(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic, uint16_t configuration){ return gatt_client_write_client_characteristic_configuration_with_context(callback, con_handle, characteristic, configuration, 0, 0); } uint8_t gatt_client_read_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = descriptor_handle; gatt_client->state = P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ return gatt_client_read_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); } uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = descriptor_handle; gatt_client->attribute_offset = offset; gatt_client->state = P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle){ return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0); } uint8_t gatt_client_read_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor){ return gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle); } uint8_t gatt_client_write_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = descriptor_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_offset = 0; gatt_client->attribute_value = value; gatt_client->state = P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t value_length, uint8_t * value){ return gatt_client_write_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); } uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = descriptor_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_offset = offset; gatt_client->attribute_value = value; gatt_client->state = P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR; gatt_client_run(); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t value_length, uint8_t * value){ return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(callback, con_handle, descriptor_handle, 0, value_length, value); } uint8_t gatt_client_write_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t value_length, uint8_t * value){ return gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(callback, con_handle, descriptor->handle, value_length, value); } /** * @brief -> gatt complete event */ uint8_t gatt_client_prepare_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint16_t value_length, uint8_t * value){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->attribute_handle = attribute_handle; gatt_client->attribute_length = value_length; gatt_client->attribute_offset = offset; gatt_client->attribute_value = value; gatt_client->state = P_W2_PREPARE_WRITE_SINGLE; gatt_client_run(); return ERROR_CODE_SUCCESS; } /** * @brief -> gatt complete event */ uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->state = P_W2_EXECUTE_PREPARED_WRITE; gatt_client_run(); return ERROR_CODE_SUCCESS; } /** * @brief -> gatt complete event */ uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_request(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } gatt_client->callback = callback; gatt_client->state = P_W2_CANCEL_PREPARED_WRITE; gatt_client_run(); return ERROR_CODE_SUCCESS; } void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t * service){ service->start_group_handle = little_endian_read_16(packet, offset); service->end_group_handle = little_endian_read_16(packet, offset + 2); reverse_128(&packet[offset + 4], service->uuid128); if (uuid_has_bluetooth_prefix(service->uuid128)){ service->uuid16 = big_endian_read_32(service->uuid128, 0); } else { service->uuid16 = 0; } } void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic){ characteristic->start_handle = little_endian_read_16(packet, offset); characteristic->value_handle = little_endian_read_16(packet, offset + 2); characteristic->end_handle = little_endian_read_16(packet, offset + 4); characteristic->properties = little_endian_read_16(packet, offset + 6); reverse_128(&packet[offset+8], characteristic->uuid128); if (uuid_has_bluetooth_prefix(characteristic->uuid128)){ characteristic->uuid16 = big_endian_read_32(characteristic->uuid128, 0); } else { characteristic->uuid16 = 0; } } void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor){ descriptor->handle = little_endian_read_16(packet, offset); reverse_128(&packet[offset+2], descriptor->uuid128); if (uuid_has_bluetooth_prefix(descriptor->uuid128)){ descriptor->uuid16 = big_endian_read_32(descriptor->uuid128, 0); } else { descriptor->uuid16 = 0; } } void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return; } if (gatt_client->mtu_state == MTU_AUTO_EXCHANGE_DISABLED){ gatt_client->callback = callback; gatt_client->mtu_state = SEND_MTU_EXCHANGE; gatt_client_run(); } } uint8_t gatt_client_request_to_write_without_response(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } bool added = btstack_linked_list_add_tail(&gatt_client->write_without_response_requests, (btstack_linked_item_t*) callback_registration); if (added == false){ return ERROR_CODE_COMMAND_DISALLOWED; } else { att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); return ERROR_CODE_SUCCESS; } } uint8_t gatt_client_request_to_send_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } bool added = btstack_linked_list_add_tail(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); if (added == false){ return ERROR_CODE_COMMAND_DISALLOWED; } else { gatt_client_notify_can_send_query(gatt_client); return ERROR_CODE_SUCCESS; } } uint8_t gatt_client_remove_gatt_query(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } (void)btstack_linked_list_remove(&gatt_client->query_requests, (btstack_linked_item_t*) callback_registration); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } if (gatt_client->write_without_response_callback != NULL){ return GATT_CLIENT_IN_WRONG_STATE; } gatt_client->write_without_response_callback = callback; att_dispatch_client_request_can_send_now_event(gatt_client->con_handle); return ERROR_CODE_SUCCESS; } uint8_t gatt_client_att_status_to_error_code(uint8_t att_error_code){ switch (att_error_code){ case ATT_ERROR_SUCCESS: return ERROR_CODE_SUCCESS; case ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH: return ERROR_CODE_PARAMETER_OUT_OF_MANDATORY_RANGE; default: log_info("ATT ERROR 0x%02x mapped to ERROR_CODE_UNSPECIFIED_ERROR", att_error_code); return ERROR_CODE_UNSPECIFIED_ERROR; } } #ifdef ENABLE_GATT_CLIENT_SERVICE_CHANGED void gatt_client_add_service_changed_handler(btstack_packet_callback_registration_t * callback) { btstack_linked_list_add_tail(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); } void gatt_client_remove_service_changed_handler(btstack_packet_callback_registration_t * callback){ btstack_linked_list_remove(&gatt_client_service_changed_handler, (btstack_linked_item_t*) callback); } #endif #if defined(ENABLE_GATT_OVER_CLASSIC) || defined(ENABLE_GATT_OVER_EATT) #include "hci_event.h" static const hci_event_t gatt_client_connected = { GATT_EVENT_CONNECTED, 0, "11BH" }; static const hci_event_t gatt_client_disconnected = { GATT_EVENT_DISCONNECTED, 0, "H" }; static void gatt_client_emit_connected(btstack_packet_handler_t callback, uint8_t status, bd_addr_type_t addr_type, bd_addr_t addr, hci_con_handle_t con_handle) { uint8_t buffer[20]; uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_connected, status, addr_type, addr, con_handle); (*callback)(HCI_EVENT_PACKET, 0, buffer, len); } #endif #ifdef ENABLE_GATT_OVER_CLASSIC #include "bluetooth_psm.h" // single active SDP query static gatt_client_t * gatt_client_classic_active_sdp_query; // macos protocol descriptor list requires 16 bytes static uint8_t gatt_client_classic_sdp_buffer[32]; static gatt_client_t * gatt_client_get_context_for_classic_addr(bd_addr_t addr){ btstack_linked_item_t *it; for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ gatt_client_t * gatt_client = (gatt_client_t *) it; if (memcmp(gatt_client->addr, addr, 6) == 0){ return gatt_client; } } return NULL; } static gatt_client_t * gatt_client_get_context_for_l2cap_cid(uint16_t l2cap_cid){ btstack_linked_item_t *it; for (it = (btstack_linked_item_t *) gatt_client_connections; it != NULL; it = it->next){ gatt_client_t * gatt_client = (gatt_client_t *) it; if (gatt_client->l2cap_cid == l2cap_cid){ return gatt_client; } } return NULL; } static void gatt_client_classic_handle_connected(gatt_client_t * gatt_client, uint8_t status){ // cache peer information bd_addr_t addr; // cppcheck-suppress uninitvar ; addr is reported as uninitialized although it's the destination of the memcpy memcpy(addr, gatt_client->addr, 6); bd_addr_type_t addr_type = gatt_client->addr_type; gatt_client->addr_type = BD_ADDR_TYPE_ACL; hci_con_handle_t con_handle = gatt_client->con_handle; btstack_packet_handler_t callback = gatt_client->callback; if (status != ERROR_CODE_SUCCESS){ btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); btstack_memory_gatt_client_free(gatt_client); } gatt_client_emit_connected(callback, status, addr_type, addr, con_handle); } static void gatt_client_classic_retry(btstack_timer_source_t * ts){ gatt_client_t * gatt_client = gatt_client_for_timer(ts); if (gatt_client != NULL){ gatt_client->state = P_W4_L2CAP_CONNECTION; att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); } } static void gatt_client_classic_handle_disconnected(gatt_client_t * gatt_client){ gatt_client_report_error_if_pending(gatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); gatt_client_timeout_stop(gatt_client); hci_con_handle_t con_handle = gatt_client->con_handle; btstack_packet_handler_t callback = gatt_client->callback; btstack_linked_list_remove(&gatt_client_connections, (btstack_linked_item_t *) gatt_client); btstack_memory_gatt_client_free(gatt_client); uint8_t buffer[20]; uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, con_handle); (*callback)(HCI_EVENT_PACKET, 0, buffer, len); } static void gatt_client_handle_sdp_client_query_attribute_value(gatt_client_t * connection, uint8_t *packet){ des_iterator_t des_list_it; des_iterator_t prot_it; if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= sizeof(gatt_client_classic_sdp_buffer)) { gatt_client_classic_sdp_buffer[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: for (des_iterator_init(&des_list_it, gatt_client_classic_sdp_buffer); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { uint8_t *des_element; uint8_t *element; uint32_t uuid; if (des_iterator_get_type(&des_list_it) != DE_DES) continue; des_element = des_iterator_get_element(&des_list_it); des_iterator_init(&prot_it, des_element); element = des_iterator_get_element(&prot_it); if (de_get_element_type(element) != DE_UUID) continue; uuid = de_get_uuid32(element); des_iterator_next(&prot_it); // we assume that the even if there are both roles supported, remote device uses the same psm and avdtp version for both switch (uuid){ case BLUETOOTH_PROTOCOL_L2CAP: if (!des_iterator_has_more(&prot_it)) continue; de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->l2cap_psm); break; default: break; } } break; default: break; } } } } static void gatt_client_classic_sdp_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ gatt_client_t * gatt_client = gatt_client_classic_active_sdp_query; btstack_assert(gatt_client != NULL); uint8_t status; // TODO: handle sdp events, get l2cap psm switch (hci_event_packet_get_type(packet)){ case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: gatt_client_handle_sdp_client_query_attribute_value(gatt_client, packet); // TODO: return; case SDP_EVENT_QUERY_COMPLETE: status = sdp_event_query_complete_get_status(packet); gatt_client_classic_active_sdp_query = NULL; log_info("l2cap psm: %0x, status %02x", gatt_client->l2cap_psm, status); if (status != ERROR_CODE_SUCCESS) break; if (gatt_client->l2cap_psm == 0) { status = SDP_SERVICE_NOT_FOUND; break; } break; default: btstack_assert(false); return; } // done if (status == ERROR_CODE_SUCCESS){ gatt_client->state = P_W4_L2CAP_CONNECTION; status = att_dispatch_classic_connect(gatt_client->addr, gatt_client->l2cap_psm, &gatt_client->l2cap_cid); } if (status != ERROR_CODE_SUCCESS) { gatt_client_classic_handle_connected(gatt_client, status); } } static void gatt_client_classic_sdp_start(void * context){ gatt_client_classic_active_sdp_query = (gatt_client_t *) context; gatt_client_classic_active_sdp_query->state = P_W4_SDP_QUERY; sdp_client_query_uuid16(gatt_client_classic_sdp_handler, gatt_client_classic_active_sdp_query->addr, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); } static void gatt_client_classic_emit_connected(void * context){ gatt_client_t * gatt_client = (gatt_client_t *) context; gatt_client->state = P_READY; gatt_client_emit_connected(gatt_client->callback, ERROR_CODE_SUCCESS, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); } uint8_t gatt_client_classic_connect(btstack_packet_handler_t callback, bd_addr_t addr){ gatt_client_t * gatt_client = gatt_client_get_context_for_classic_addr(addr); if (gatt_client != NULL){ return ERROR_CODE_ACL_CONNECTION_ALREADY_EXISTS; } gatt_client = btstack_memory_gatt_client_get(); if (gatt_client == NULL){ return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED; } // init state gatt_client->bearer_type = ATT_BEARER_UNENHANCED_CLASSIC; gatt_client->con_handle = HCI_CON_HANDLE_INVALID; memcpy(gatt_client->addr, addr, 6); gatt_client->addr_type = BD_ADDR_TYPE_ACL; gatt_client->mtu = ATT_DEFAULT_MTU; gatt_client->security_level = LEVEL_0; gatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; gatt_client->callback = callback; #ifdef ENABLE_GATT_OVER_EATT gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; #endif btstack_linked_list_add(&gatt_client_connections, (btstack_linked_item_t*)gatt_client); // schedule emitted event if already connected, otherwise bool already_connected = false; hci_connection_t * hci_connection = hci_connection_for_bd_addr_and_type(addr, BD_ADDR_TYPE_ACL); if (hci_connection != NULL){ if (hci_connection->att_server.l2cap_cid != 0){ already_connected = true; } } gatt_client->callback_request.context = gatt_client; if (already_connected){ gatt_client->con_handle = hci_connection->con_handle; gatt_client->callback_request.callback = &gatt_client_classic_emit_connected; gatt_client->state = P_W2_EMIT_CONNECTED; btstack_run_loop_execute_on_main_thread(&gatt_client->callback_request); } else { gatt_client->callback_request.callback = &gatt_client_classic_sdp_start; gatt_client->state = P_W2_SDP_QUERY; sdp_client_register_query_callback(&gatt_client->callback_request); } return ERROR_CODE_SUCCESS; } uint8_t gatt_client_classic_disconnect(btstack_packet_handler_t callback, hci_con_handle_t con_handle){ gatt_client_t * gatt_client = gatt_client_get_context_for_handle(con_handle); if (gatt_client == NULL){ return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; } gatt_client->callback = callback; return l2cap_disconnect(gatt_client->l2cap_cid); } #endif #ifdef ENABLE_GATT_OVER_EATT #define MAX_NR_EATT_CHANNELS 5 static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static uint8_t gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client_t * gatt_client, gatt_client_state_t state){ uint8_t num_clients = 0; btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it)){ gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (eatt_client->state == state){ num_clients++; } } return num_clients; } static void gatt_client_eatt_finalize(gatt_client_t * gatt_client) { // free eatt clients btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_connections); while (btstack_linked_list_iterator_has_next(&it)) { gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); btstack_linked_list_iterator_remove(&it); btstack_memory_gatt_client_free(eatt_client); } } // all channels connected static void gatt_client_le_enhanced_handle_connected(gatt_client_t * gatt_client, uint8_t status) { if (status == ERROR_CODE_SUCCESS){ uint8_t num_ready = gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_READY); if (num_ready > 0){ gatt_client->eatt_state = GATT_CLIENT_EATT_READY; // free unused channels btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_connections); while (btstack_linked_list_iterator_has_next(&it)) { gatt_client_t *eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); if (eatt_client->state == P_L2CAP_CLOSED){ btstack_linked_list_iterator_remove(&it); btstack_memory_gatt_client_free(eatt_client); } } } else { hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); btstack_assert(hci_connection != NULL); if (hci_connection->att_server.incoming_connection_request){ hci_connection->att_server.incoming_connection_request = false; log_info("Collision, retry in 100ms"); gatt_client->state = P_W2_L2CAP_CONNECT; // set timer for retry btstack_run_loop_set_timer(&gatt_client->gc_timeout, GATT_CLIENT_COLLISION_BACKOFF_MS); btstack_run_loop_set_timer_handler(&gatt_client->gc_timeout, gatt_client_le_enhanced_retry); btstack_run_loop_add_timer(&gatt_client->gc_timeout); return; } else { gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; status = ERROR_CODE_CONNECTION_REJECTED_DUE_TO_LIMITED_RESOURCES; } } } else { gatt_client_eatt_finalize(gatt_client); gatt_client->eatt_state = GATT_CLIENT_EATT_IDLE; } gatt_client_emit_connected(gatt_client->callback, status, gatt_client->addr_type, gatt_client->addr, gatt_client->con_handle); } // single channel disconnected static void gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client_t * gatt_client, gatt_client_t * eatt_client) { // report error gatt_client_report_error_if_pending(eatt_client, ATT_ERROR_HCI_DISCONNECT_RECEIVED); // free memory btstack_linked_list_remove(&gatt_client->eatt_clients, (btstack_linked_item_t *) eatt_client); btstack_memory_gatt_client_free(eatt_client); // last channel if (btstack_linked_list_empty(&gatt_client->eatt_clients)){ hci_connection_t * hci_connection = hci_connection_for_handle(gatt_client->con_handle); hci_connection->att_server.eatt_outgoing_active = false; if (gatt_client->eatt_state == GATT_CLIENT_EATT_READY) { // report disconnected if last channel closed uint8_t buffer[20]; uint16_t len = hci_event_create_from_template_and_arguments(buffer, sizeof(buffer), &gatt_client_disconnected, gatt_client->con_handle); (*gatt_client->callback)(HCI_EVENT_PACKET, 0, buffer, len); } } } static gatt_client_t * gatt_client_le_enhanced_get_context_for_l2cap_cid(uint16_t l2cap_cid, gatt_client_t ** out_eatt_client){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client_connections); while (btstack_linked_list_iterator_has_next(&it)) { gatt_client_t * gatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); btstack_linked_list_iterator_t it2; btstack_linked_list_iterator_init(&it2, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it2)) { gatt_client_t * eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it2); if (eatt_client->l2cap_cid == l2cap_cid){ *out_eatt_client = eatt_client; return gatt_client; } } } return NULL; } static void gatt_client_le_enhanced_setup_l2cap_channel(gatt_client_t * gatt_client){ uint8_t num_channels = gatt_client->eatt_num_clients; // setup channels uint16_t buffer_size_per_client = gatt_client->eatt_storage_size / num_channels; uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; uint8_t * receive_buffers[MAX_NR_EATT_CHANNELS]; uint16_t new_cids[MAX_NR_EATT_CHANNELS]; memset(gatt_client->eatt_storage_buffer, 0, gatt_client->eatt_storage_size); uint8_t i; for (i=0;ieatt_num_clients; i++){ receive_buffers[i] = &gatt_client->eatt_storage_buffer[REPORT_PREBUFFER_HEADER]; gatt_client->eatt_storage_buffer += REPORT_PREBUFFER_HEADER + max_mtu; } log_info("%u EATT clients with receive buffer size %u", gatt_client->eatt_num_clients, buffer_size_per_client); uint8_t status = l2cap_ecbm_create_channels(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, gatt_client->security_level, BLUETOOTH_PSM_EATT, num_channels, L2CAP_LE_AUTOMATIC_CREDITS, buffer_size_per_client, receive_buffers, new_cids); if (status == ERROR_CODE_SUCCESS){ i = 0; btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, &gatt_client->eatt_clients); while (btstack_linked_list_iterator_has_next(&it)) { gatt_client_t *new_eatt_client = (gatt_client_t *) btstack_linked_list_iterator_next(&it); // init state with new cid and transmit buffer new_eatt_client->bearer_type = ATT_BEARER_ENHANCED_LE; new_eatt_client->con_handle = gatt_client->con_handle; new_eatt_client->mtu = 64; new_eatt_client->security_level = LEVEL_0; new_eatt_client->mtu_state = MTU_AUTO_EXCHANGE_DISABLED; new_eatt_client->state = P_W4_L2CAP_CONNECTION; new_eatt_client->l2cap_cid = new_cids[i]; new_eatt_client->eatt_storage_buffer = gatt_client->eatt_storage_buffer; gatt_client->eatt_storage_buffer += max_mtu; i++; } gatt_client->eatt_state = GATT_CLIENT_EATT_L2CAP_SETUP; } else { gatt_client_le_enhanced_handle_connected(gatt_client, status); } } static void gatt_client_le_enhanced_retry(btstack_timer_source_t * ts){ gatt_client_t * gatt_client = gatt_client_for_timer(ts); if (gatt_client != NULL){ gatt_client->state = P_W4_L2CAP_CONNECTION; gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); } } static void gatt_client_le_enhanced_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { gatt_client_t *gatt_client; gatt_client_t *eatt_client; hci_con_handle_t con_handle; uint16_t l2cap_cid; uint8_t status; gatt_client_characteristic_t characteristic; gatt_client_service_t service; switch (packet_type) { case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)) { case GATT_EVENT_SERVICE_QUERY_RESULT: con_handle = gatt_event_service_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE); gatt_event_service_query_result_get_service(packet, &service); gatt_client->gatt_service_start_group_handle = service.start_group_handle; gatt_client->gatt_service_end_group_handle = service.end_group_handle; break; case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: con_handle = gatt_event_characteristic_value_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE); if (gatt_event_characteristic_value_query_result_get_value_length(packet) >= 1) { gatt_client->gatt_server_supported_features = gatt_event_characteristic_value_query_result_get_value(packet)[0]; } break; case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: con_handle = gatt_event_characteristic_query_result_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); btstack_assert(gatt_client->eatt_state == GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE); gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); gatt_client->gatt_client_supported_features_handle = characteristic.value_handle; break; case GATT_EVENT_QUERY_COMPLETE: con_handle = gatt_event_query_complete_get_handle(packet); gatt_client = gatt_client_get_context_for_handle(con_handle); btstack_assert(gatt_client != NULL); switch (gatt_client->eatt_state){ case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE: if (gatt_client->gatt_service_start_group_handle == 0){ gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); } else { gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND; } break; case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE: if ((gatt_client->gatt_server_supported_features & 1) == 0) { gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); } else { gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND; } break; case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE: if (gatt_client->gatt_client_supported_features_handle == 0){ gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE); } else { gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND; } break; case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE: gatt_client_le_enhanced_setup_l2cap_channel(gatt_client); break; default: break; } break; case L2CAP_EVENT_ECBM_CHANNEL_OPENED: l2cap_cid = l2cap_event_ecbm_channel_opened_get_local_cid(packet); gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); btstack_assert(gatt_client != NULL); btstack_assert(eatt_client != NULL); btstack_assert(eatt_client->state == P_W4_L2CAP_CONNECTION); status = l2cap_event_channel_opened_get_status(packet); if (status == ERROR_CODE_SUCCESS){ eatt_client->state = P_READY; eatt_client->mtu = l2cap_event_channel_opened_get_remote_mtu(packet); } else { eatt_client->state = P_L2CAP_CLOSED; } // connected if opened event for all channels received if (gatt_client_le_enhanced_num_eatt_clients_in_state(gatt_client, P_W4_L2CAP_CONNECTION) == 0){ gatt_client_le_enhanced_handle_connected(gatt_client, ERROR_CODE_SUCCESS); } break; case L2CAP_EVENT_CHANNEL_CLOSED: l2cap_cid = l2cap_event_channel_closed_get_local_cid(packet); gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(l2cap_cid, &eatt_client); btstack_assert(gatt_client != NULL); btstack_assert(eatt_client != NULL); gatt_client_le_enhanced_handle_ecbm_disconnected(gatt_client, eatt_client); break; default: break; } break; case L2CAP_DATA_PACKET: gatt_client = gatt_client_le_enhanced_get_context_for_l2cap_cid(channel, &eatt_client); btstack_assert(gatt_client != NULL); btstack_assert(eatt_client != NULL); gatt_client_handle_att_response(eatt_client, packet, size); gatt_client_run(); break; default: break; } } static bool gatt_client_le_enhanced_handle_can_send_query(gatt_client_t * gatt_client){ uint8_t status = ERROR_CODE_SUCCESS; uint8_t gatt_client_supported_features = 0x06; // eatt + multiple value notifications switch (gatt_client->eatt_state){ case GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND: gatt_client->gatt_service_start_group_handle = 0; gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W4_DONE; status = gatt_client_discover_primary_services_by_uuid16(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, ORG_BLUETOOTH_SERVICE_GENERIC_ATTRIBUTE); break; case GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W2_SEND: gatt_client->gatt_server_supported_features = 0; gatt_client->eatt_state = GATT_CLIENT_EATT_READ_SERVER_SUPPORTED_FEATURES_W4_DONE; status = gatt_client_read_value_of_characteristics_by_uuid16(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, gatt_client->gatt_service_start_group_handle, gatt_client->gatt_service_end_group_handle, ORG_BLUETOOTH_CHARACTERISTIC_SERVER_SUPPORTED_FEATURES); return true; case GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W2_SEND: gatt_client->gatt_client_supported_features_handle = 0; gatt_client->eatt_state = GATT_CLIENT_EATT_FIND_CLIENT_SUPPORTED_FEATURES_W4_DONE; status = gatt_client_discover_characteristics_for_handle_range_by_uuid16(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, gatt_client->gatt_service_start_group_handle, gatt_client->gatt_service_end_group_handle, ORG_BLUETOOTH_CHARACTERISTIC_CLIENT_SUPPORTED_FEATURES); return true; case GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W2_SEND: gatt_client->eatt_state = GATT_CLIENT_EATT_WRITE_ClIENT_SUPPORTED_FEATURES_W4_DONE; status = gatt_client_write_value_of_characteristic(&gatt_client_le_enhanced_packet_handler, gatt_client->con_handle, gatt_client->gatt_client_supported_features_handle, 1, &gatt_client_supported_features); return true; default: break; } btstack_assert(status == ERROR_CODE_SUCCESS); UNUSED(status); return false; } uint8_t gatt_client_le_enhanced_connect(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint8_t num_channels, uint8_t * storage_buffer, uint16_t storage_size) { gatt_client_t * gatt_client; uint8_t status = gatt_client_provide_context_for_handle(con_handle, &gatt_client); if (status != ERROR_CODE_SUCCESS){ return status; } if (gatt_client->eatt_state != GATT_CLIENT_EATT_IDLE){ return ERROR_CODE_COMMAND_DISALLOWED; } // need one buffer for sending and one for receiving. Receiving includes pre-buffer for reports uint16_t buffer_size_per_client = storage_size / num_channels; uint16_t max_mtu = (buffer_size_per_client - REPORT_PREBUFFER_HEADER) / 2; if (max_mtu < 64) { return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; } if ((num_channels == 0) || (num_channels > MAX_NR_EATT_CHANNELS)){ return ERROR_CODE_INVALID_HCI_COMMAND_PARAMETERS; } // create max num_channel eatt clients uint8_t i; btstack_linked_list_t eatt_clients = NULL; for (i=0;iatt_server.eatt_outgoing_active = true; gatt_client->callback = callback; gatt_client->eatt_num_clients = num_channels; gatt_client->eatt_storage_buffer = storage_buffer; gatt_client->eatt_storage_size = storage_size; gatt_client->eatt_clients = eatt_clients; gatt_client->eatt_state = GATT_CLIENT_EATT_DISCOVER_GATT_SERVICE_W2_SEND; gatt_client_notify_can_send_query(gatt_client); return ERROR_CODE_SUCCESS; } void gatt_client_le_enhanced_enable(bool enable){ gatt_client_eatt_enabled = enable; } #endif #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION void gatt_client_att_packet_handler_fuzz(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ gatt_client_att_packet_handler(packet_type, handle, packet, size); } uint8_t gatt_client_get_client(hci_con_handle_t con_handle, gatt_client_t ** out_gatt_client){ uint8_t status = gatt_client_provide_context_for_handle(con_handle, out_gatt_client); return status; } #endif