1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "le_streamer_client.c" 39 40 // ***************************************************************************** 41 // 42 // LE Streamer Client - connects to 'LE Streamer' and subscribes to test characteristic 43 // 44 // ***************************************************************************** 45 46 #include <stdint.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "btstack.h" 52 53 typedef enum { 54 TC_IDLE, 55 TC_W4_SCAN_RESULT, 56 TC_W4_CONNECT, 57 TC_W4_SERVICE_RESULT, 58 TC_W4_CHARACTERISTIC_RESULT, 59 TC_W4_TEST_DATA 60 } gc_state_t; 61 62 static bd_addr_t cmdline_addr = { }; 63 static int cmdline_addr_found = 0; 64 65 // addr and type of device with correct name 66 static bd_addr_t le_streamer_addr; 67 static bd_addr_type_t le_streamer_addr_type; 68 69 static hci_con_handle_t connection_handle; 70 static uint8_t le_streamer_service_uuid[16] = { 0x00, 0x00, 0xFF, 0x10, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 71 static uint8_t le_streamer_characteristic_uuid[16] = { 0x00, 0x00, 0xFF, 0x11, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 72 73 static gatt_client_service_t le_streamer_service; 74 static gatt_client_characteristic_t le_streamer_characteristic; 75 76 static gatt_client_notification_t notification_listener; 77 static int listener_registered; 78 79 static gc_state_t state = TC_IDLE; 80 static btstack_packet_callback_registration_t hci_event_callback_registration; 81 82 // returns 1 if name is found in advertisement 83 static int advertisement_report_contains_name(const char * name, uint8_t * advertisement_report){ 84 // get advertisement from report event 85 const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report); 86 uint16_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report); 87 int name_len = strlen(name); 88 89 // iterate over advertisement data 90 ad_context_t context; 91 for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 92 uint8_t data_type = ad_iterator_get_data_type(&context); 93 uint8_t data_size = ad_iterator_get_data_len(&context); 94 const uint8_t * data = ad_iterator_get_data(&context); 95 int i; 96 switch (data_type){ 97 case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME: 98 case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME: 99 // compare common prefix 100 for (i=0; i<data_size && i<name_len;i++){ 101 if (data[i] != name[i]) break; 102 } 103 // prefix match 104 return 1; 105 default: 106 break; 107 } 108 } 109 return 0; 110 } 111 112 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 113 UNUSED(packet_type); 114 UNUSED(channel); 115 UNUSED(size); 116 117 switch(state){ 118 case TC_W4_SERVICE_RESULT: 119 switch(hci_event_packet_get_type(packet)){ 120 case GATT_EVENT_SERVICE_QUERY_RESULT: 121 // store service (we expect only one) 122 gatt_event_service_query_result_get_service(packet, &le_streamer_service); 123 break; 124 case GATT_EVENT_QUERY_COMPLETE: 125 if (packet[4] != 0){ 126 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 127 gap_disconnect(connection_handle); 128 break; 129 } 130 // service query complete, look for characteristic 131 state = TC_W4_CHARACTERISTIC_RESULT; 132 printf("Search for LE Streamer test characteristic.\n"); 133 gatt_client_discover_characteristics_for_service_by_uuid128(handle_gatt_client_event, connection_handle, &le_streamer_service, le_streamer_characteristic_uuid); 134 break; 135 default: 136 break; 137 } 138 break; 139 140 case TC_W4_CHARACTERISTIC_RESULT: 141 switch(hci_event_packet_get_type(packet)){ 142 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 143 gatt_event_characteristic_query_result_get_characteristic(packet, &le_streamer_characteristic); 144 break; 145 case GATT_EVENT_QUERY_COMPLETE: 146 if (packet[4] != 0){ 147 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 148 gap_disconnect(connection_handle); 149 break; 150 } 151 // register handler for notifications 152 listener_registered = 1; 153 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &le_streamer_characteristic); 154 // enable notifications 155 state = TC_W4_TEST_DATA; 156 printf("Start streaming - enable notify on test characteristic.\n"); 157 gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &le_streamer_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 158 break; 159 default: 160 break; 161 } 162 break; 163 164 case TC_W4_TEST_DATA: 165 switch(hci_event_packet_get_type(packet)){ 166 case GATT_EVENT_NOTIFICATION: 167 printf("Data: "); 168 printf_hexdump( gatt_event_notification_get_value(packet), gatt_event_notification_get_value_length(packet)); 169 case GATT_EVENT_QUERY_COMPLETE: 170 break; 171 default: 172 printf("Unknown packet type %x\n", hci_event_packet_get_type(packet)); 173 break; 174 } 175 break; 176 177 default: 178 printf("error\n"); 179 break; 180 } 181 182 } 183 184 // Either connect to remote specified on command line or start scan for device with "LE Streamer" in advertisement 185 static void le_streamer_client_start(void){ 186 if (cmdline_addr_found){ 187 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 188 state = TC_W4_CONNECT; 189 gap_connect(cmdline_addr, 0); 190 } else { 191 printf("Start scanning!\n"); 192 state = TC_W4_SCAN_RESULT; 193 gap_set_scan_parameters(0,0x0030, 0x0030); 194 gap_start_scan(); 195 } 196 } 197 198 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 199 UNUSED(channel); 200 UNUSED(size); 201 202 if (packet_type != HCI_EVENT_PACKET) return; 203 204 uint16_t conn_interval; 205 uint8_t event = hci_event_packet_get_type(packet); 206 switch (event) { 207 case BTSTACK_EVENT_STATE: 208 // BTstack activated, get started 209 if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) break; 210 le_streamer_client_start(); 211 break; 212 case GAP_EVENT_ADVERTISING_REPORT: 213 if (state != TC_W4_SCAN_RESULT) return; 214 // check name in advertisement 215 if (!advertisement_report_contains_name("LE Streamer", packet)) return; 216 // store address and type 217 gap_event_advertising_report_get_address(packet, le_streamer_addr); 218 le_streamer_addr_type = gap_event_advertising_report_get_address_type(packet); 219 // stop scanning, and connect to the device 220 state = TC_W4_CONNECT; 221 gap_stop_scan(); 222 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_streamer_addr)); 223 gap_connect(le_streamer_addr,le_streamer_addr_type); 224 break; 225 case HCI_EVENT_LE_META: 226 // wait for connection complete 227 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 228 if (state != TC_W4_CONNECT) return; 229 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 230 // print connection parameters (without using float operations) 231 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 232 printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); 233 printf("Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); 234 // initialize gatt client context with handle, and add it to the list of active clients 235 // query primary services 236 printf("Search for LE Streamer service.\n"); 237 state = TC_W4_SERVICE_RESULT; 238 gatt_client_discover_primary_services_by_uuid128(handle_gatt_client_event, connection_handle, le_streamer_service_uuid); 239 break; 240 case HCI_EVENT_DISCONNECTION_COMPLETE: 241 // unregister listener 242 if (listener_registered){ 243 listener_registered = 0; 244 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 245 } 246 if (cmdline_addr_found){ 247 printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr)); 248 return; 249 } 250 printf("Disconnected %s\n", bd_addr_to_str(le_streamer_addr)); 251 le_streamer_client_start(); 252 break; 253 default: 254 break; 255 } 256 } 257 258 #ifdef HAVE_BTSTACK_STDIN 259 static void usage(const char *name){ 260 fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 261 fprintf(stderr, "If no argument is provided, LE Streamer Client will start scanning and connect to the first device named 'LE Streamer'.\n"); 262 fprintf(stderr, "To connect to a specific device use argument [-a].\n\n"); 263 } 264 #endif 265 266 int btstack_main(int argc, const char * argv[]); 267 int btstack_main(int argc, const char * argv[]){ 268 269 #ifdef HAVE_BTSTACK_STDIN 270 int arg = 1; 271 cmdline_addr_found = 0; 272 273 while (arg < argc) { 274 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 275 arg++; 276 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 277 arg++; 278 if (!cmdline_addr_found) exit(1); 279 continue; 280 } 281 usage(argv[0]); 282 return 0; 283 } 284 #else 285 (void)argc; 286 (void)argv; 287 #endif 288 289 hci_event_callback_registration.callback = &hci_event_handler; 290 hci_add_event_handler(&hci_event_callback_registration); 291 292 l2cap_init(); 293 294 gatt_client_init(); 295 296 sm_init(); 297 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 298 299 // turn on! 300 hci_power_control(HCI_POWER_ON); 301 302 return 0; 303 } 304