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__ "pb_adv.c" 39 40 #include "pb_adv.h" 41 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 47 #include "btstack_debug.h" 48 #include "btstack_event.h" 49 #include "btstack_util.h" 50 51 #include "mesh/adv_bearer.h" 52 #include "mesh/beacon.h" 53 #include "mesh/mesh_node.h" 54 #include "mesh/provisioning.h" 55 56 #define PB_ADV_LINK_OPEN_RETRANSMIT_MS 1000 57 #define PB_ADV_LINK_OPEN_TIMEOUT_MS 60000 58 #define PB_ADV_LINK_OPEN_RETRIES (PB_ADV_LINK_OPEN_TIMEOUT_MS / PB_ADV_LINK_OPEN_RETRANSMIT_MS) 59 static void pb_adv_run(void); 60 61 /* taps: 32 31 29 1; characteristic polynomial: x^32 + x^31 + x^29 + x + 1 */ 62 #define LFSR(a) ((a >> 1) ^ (uint32_t)((0 - (a & 1u)) & 0xd0000001u)) 63 64 // PB-ADV - Provisioning Bearer using Advertisement Bearer 65 66 #define MESH_GENERIC_PROVISIONING_LINK_OPEN 0x00 67 #define MESH_GENERIC_PROVISIONING_LINK_ACK 0x01 68 #define MESH_GENERIC_PROVISIONING_LINK_CLOSE 0x02 69 70 #define MESH_GENERIC_PROVISIONING_TRANSACTION_TIMEOUT_MS 30000 71 72 #define MESH_PB_ADV_MAX_PDU_SIZE 100 73 #define MESH_PB_ADV_MAX_SEGMENTS 8 74 #define MESH_PB_ADV_START_PAYLOAD 20 75 #define MESH_PB_ADV_CONT_PAYLOAD 23 76 77 typedef enum mesh_gpcf_format { 78 MESH_GPCF_TRANSACTION_START = 0, 79 MESH_GPCF_TRANSACTION_ACK, 80 MESH_GPCF_TRANSACTION_CONT, 81 MESH_GPCF_PROV_BEARER_CONTROL, 82 } mesh_gpcf_format_t; 83 84 typedef enum { 85 LINK_STATE_W4_OPEN, 86 LINK_STATE_W2_SEND_ACK, 87 LINK_STATE_W4_ACK, 88 LINK_STATE_OPEN, 89 LINK_STATE_CLOSING, 90 } link_state_t; 91 static link_state_t link_state; 92 93 #ifdef ENABLE_MESH_PROVISIONER 94 static const uint8_t * pb_adv_peer_device_uuid; 95 static uint8_t pb_adv_provisioner_open_countdown; 96 #endif 97 98 static uint8_t pb_adv_msg_in_buffer[MESH_PB_ADV_MAX_PDU_SIZE]; // TODO: how large are prov messages? 99 100 // single adv link 101 static uint16_t pb_adv_cid = 1; 102 static uint8_t pb_adv_provisioner_role; 103 104 // link state 105 static uint32_t pb_adv_link_id; 106 static uint8_t pb_adv_link_close_reason; 107 static uint8_t pb_adv_link_close_countdown; 108 static btstack_timer_source_t pb_adv_link_timeout; 109 110 // random delay for outgoing packets 111 static uint32_t pb_adv_lfsr; 112 static uint8_t pb_adv_random_delay_active; 113 static btstack_timer_source_t pb_adv_random_delay_timer; 114 115 // incoming message 116 static uint8_t pb_adv_msg_in_transaction_nr_prev; 117 static uint16_t pb_adv_msg_in_len; // 118 static uint8_t pb_adv_msg_in_fcs; 119 static uint8_t pb_adv_msg_in_last_segment; 120 static uint8_t pb_adv_msg_in_segments_missing; // bitfield for segmentes 1-n 121 static uint8_t pb_adv_msg_in_transaction_nr; 122 static uint8_t pb_adv_msg_in_send_ack; 123 124 // outgoing message 125 static uint8_t pb_adv_msg_out_active; 126 static uint8_t pb_adv_msg_out_transaction_nr; 127 static uint8_t pb_adv_msg_out_completed_transaction_nr; 128 static uint16_t pb_adv_msg_out_len; 129 static uint16_t pb_adv_msg_out_pos; 130 static uint8_t pb_adv_msg_out_seg; 131 static uint32_t pb_adv_msg_out_start; 132 static const uint8_t * pb_adv_msg_out_buffer; 133 134 static btstack_packet_handler_t pb_adv_packet_handler; 135 136 // poor man's random number generator 137 static uint32_t pb_adv_random(void){ 138 pb_adv_lfsr = LFSR(pb_adv_lfsr); 139 return pb_adv_lfsr; 140 } 141 142 static void pb_adv_emit_pdu_sent(uint8_t status){ 143 uint8_t event[] = { HCI_EVENT_MESH_META, 2, MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT, status}; 144 pb_adv_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 145 } 146 147 static void pb_adv_emit_link_open(uint8_t status, uint16_t pb_transport_cid){ 148 uint8_t event[7] = { HCI_EVENT_MESH_META, 5, MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN, status}; 149 little_endian_store_16(event, 4, pb_transport_cid); 150 event[6] = MESH_PB_TYPE_ADV; 151 pb_adv_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 152 } 153 154 static void pb_adv_emit_link_close(uint16_t pb_transport_cid, uint8_t reason){ 155 uint8_t event[6] = { HCI_EVENT_MESH_META, 3, MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED}; 156 little_endian_store_16(event, 3, pb_transport_cid); 157 event[5] = reason; 158 pb_adv_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 159 } 160 161 static void pb_adv_device_link_timeout(btstack_timer_source_t * ts){ 162 UNUSED(ts); 163 // timeout occured 164 link_state = LINK_STATE_W4_OPEN; 165 log_info("link timeout, %08x", pb_adv_link_id); 166 printf("PB-ADV: Link timeout %08x\n", pb_adv_link_id); 167 pb_adv_emit_link_close(pb_adv_cid, ERROR_CODE_PAGE_TIMEOUT); 168 } 169 170 static void pb_adv_handle_bearer_control(uint32_t link_id, uint8_t transaction_nr, const uint8_t * pdu, uint16_t size){ 171 UNUSED(transaction_nr); 172 UNUSED(size); 173 174 uint8_t bearer_opcode = pdu[0] >> 2; 175 uint8_t reason; 176 const uint8_t * own_device_uuid; 177 switch (bearer_opcode){ 178 case MESH_GENERIC_PROVISIONING_LINK_OPEN: // Open a session on a bearer with a device 179 // does it match our device_uuid? 180 own_device_uuid = mesh_node_get_device_uuid(); 181 if (!own_device_uuid) break; 182 if (memcmp(&pdu[1], own_device_uuid, 16) != 0) break; 183 btstack_run_loop_remove_timer(&pb_adv_link_timeout); 184 btstack_run_loop_set_timer(&pb_adv_link_timeout, PB_ADV_LINK_OPEN_TIMEOUT_MS); 185 btstack_run_loop_set_timer_handler(&pb_adv_link_timeout, &pb_adv_device_link_timeout); 186 btstack_run_loop_add_timer(&pb_adv_link_timeout); 187 switch(link_state){ 188 case LINK_STATE_W4_OPEN: 189 pb_adv_link_id = link_id; 190 pb_adv_provisioner_role = 0; 191 pb_adv_msg_in_transaction_nr = 0xff; // first transaction nr will be 0x00 192 pb_adv_msg_in_transaction_nr_prev = 0xff; 193 log_info("link open, id %08x", pb_adv_link_id); 194 printf("PB-ADV: Link Open %08x\n", pb_adv_link_id); 195 link_state = LINK_STATE_W2_SEND_ACK; 196 adv_bearer_request_can_send_now_for_provisioning_pdu(); 197 pb_adv_emit_link_open(ERROR_CODE_SUCCESS, pb_adv_cid); 198 break; 199 case LINK_STATE_OPEN: 200 if (pb_adv_link_id != link_id) break; 201 log_info("link open, resend ACK"); 202 link_state = LINK_STATE_W2_SEND_ACK; 203 adv_bearer_request_can_send_now_for_provisioning_pdu(); 204 break; 205 default: 206 break; 207 } 208 break; 209 #ifdef ENABLE_MESH_PROVISIONER 210 case MESH_GENERIC_PROVISIONING_LINK_ACK: // Acknowledge a session on a bearer 211 if (link_state != LINK_STATE_W4_ACK) break; 212 link_state = LINK_STATE_OPEN; 213 pb_adv_msg_out_transaction_nr = 0; 214 pb_adv_msg_in_transaction_nr = 0x7f; // first transaction nr will be 0x80 215 pb_adv_msg_in_transaction_nr_prev = 0x7f; 216 btstack_run_loop_remove_timer(&pb_adv_random_delay_timer); 217 log_info("link open, id %08x", pb_adv_link_id); 218 printf("PB-ADV: Link Open %08x\n", pb_adv_link_id); 219 pb_adv_emit_link_open(ERROR_CODE_SUCCESS, pb_adv_cid); 220 break; 221 #endif 222 case MESH_GENERIC_PROVISIONING_LINK_CLOSE: // Close a session on a bearer 223 // does it match link id 224 if (link_id != pb_adv_link_id) break; 225 if (link_state == LINK_STATE_W4_OPEN) break; 226 btstack_run_loop_remove_timer(&pb_adv_link_timeout); 227 reason = pdu[1]; 228 link_state = LINK_STATE_W4_OPEN; 229 log_info("link close, reason %x", reason); 230 pb_adv_emit_link_close(pb_adv_cid, reason); 231 break; 232 default: 233 log_info("BearerOpcode %x reserved for future use\n", bearer_opcode); 234 break; 235 } 236 } 237 238 static void pb_adv_pdu_complete(void){ 239 240 // Verify FCS 241 uint8_t pdu_crc = btstack_crc8_calc((uint8_t*)pb_adv_msg_in_buffer, pb_adv_msg_in_len); 242 if (pdu_crc != pb_adv_msg_in_fcs){ 243 printf("Incoming PDU: fcs %02x, calculated %02x -> drop packet\n", pb_adv_msg_in_fcs, btstack_crc8_calc(pb_adv_msg_in_buffer, pb_adv_msg_in_len)); 244 return; 245 } 246 247 printf("PB-ADV: %02x complete\n", pb_adv_msg_in_transaction_nr); 248 249 // transaction complete 250 pb_adv_msg_in_transaction_nr_prev = pb_adv_msg_in_transaction_nr; 251 if (pb_adv_provisioner_role){ 252 pb_adv_msg_in_transaction_nr = 0x7f; // invalid 253 } else { 254 pb_adv_msg_in_transaction_nr = 0xff; // invalid 255 } 256 257 // Ack Transaction 258 pb_adv_msg_in_send_ack = 1; 259 pb_adv_run(); 260 261 // Forward to Provisioning 262 pb_adv_packet_handler(PROVISIONING_DATA_PACKET, 0, pb_adv_msg_in_buffer, pb_adv_msg_in_len); 263 } 264 265 static void pb_adv_handle_transaction_start(uint8_t transaction_nr, const uint8_t * pdu, uint16_t size){ 266 267 // resend ack if packet from previous transaction received 268 if (transaction_nr != 0xff && transaction_nr == pb_adv_msg_in_transaction_nr_prev){ 269 printf("PB_ADV: %02x transaction complete, resending ack \n", transaction_nr); 270 pb_adv_msg_in_send_ack = 1; 271 return; 272 } 273 274 // new transaction? 275 if (transaction_nr != pb_adv_msg_in_transaction_nr){ 276 277 // check len 278 uint16_t msg_len = big_endian_read_16(pdu, 1); 279 if (msg_len > MESH_PB_ADV_MAX_PDU_SIZE){ 280 // abort transaction 281 return; 282 } 283 284 // check num segments 285 uint8_t last_segment = pdu[0] >> 2; 286 if (last_segment >= MESH_PB_ADV_MAX_SEGMENTS){ 287 // abort transaction 288 return; 289 } 290 291 printf("PB-ADV: %02x started\n", transaction_nr); 292 293 pb_adv_msg_in_transaction_nr = transaction_nr; 294 pb_adv_msg_in_len = msg_len; 295 pb_adv_msg_in_fcs = pdu[3]; 296 pb_adv_msg_in_last_segment = last_segment; 297 298 // set bits for segments 1..n (segment 0 already received in this message) 299 pb_adv_msg_in_segments_missing = (1 << last_segment) - 1; 300 301 // store payload 302 uint16_t payload_len = size - 4; 303 (void)memcpy(pb_adv_msg_in_buffer, &pdu[4], payload_len); 304 305 // complete? 306 if (pb_adv_msg_in_segments_missing == 0){ 307 pb_adv_pdu_complete(); 308 } 309 } 310 } 311 312 static void pb_adv_handle_transaction_cont(uint8_t transaction_nr, const uint8_t * pdu, uint16_t size){ 313 314 // check transaction nr 315 if (transaction_nr != 0xff && transaction_nr == pb_adv_msg_in_transaction_nr_prev){ 316 printf("PB_ADV: %02x transaction complete, resending resending ack\n", transaction_nr); 317 pb_adv_msg_in_send_ack = 1; 318 return; 319 } 320 321 if (transaction_nr != pb_adv_msg_in_transaction_nr){ 322 printf("PB-ADV: %02x received msg for transaction nr %x\n", pb_adv_msg_in_transaction_nr, transaction_nr); 323 return; 324 } 325 326 // validate seg nr 327 uint8_t seg = pdu[0] >> 2; 328 if (seg >= MESH_PB_ADV_MAX_SEGMENTS || seg == 0){ 329 return; 330 } 331 332 // check if segment already received 333 uint8_t seg_mask = 1 << (seg-1); 334 if ((pb_adv_msg_in_segments_missing & seg_mask) == 0){ 335 printf("PB-ADV: %02x, segment %u already received\n", transaction_nr, seg); 336 return; 337 } 338 printf("PB-ADV: %02x, segment %u stored\n", transaction_nr, seg); 339 340 // calculate offset and fragment size 341 uint16_t msg_pos = MESH_PB_ADV_START_PAYLOAD + (seg-1) * MESH_PB_ADV_CONT_PAYLOAD; 342 uint16_t fragment_size = size - 1; 343 344 // check size if last segment 345 if (seg == pb_adv_msg_in_last_segment && (msg_pos + fragment_size) != pb_adv_msg_in_len){ 346 // last segment has invalid size 347 return; 348 } 349 350 // store segment and mark as received 351 (void)memcpy(&pb_adv_msg_in_buffer[msg_pos], &pdu[1], fragment_size); 352 pb_adv_msg_in_segments_missing &= ~seg_mask; 353 354 // last segment 355 if (pb_adv_msg_in_segments_missing == 0){ 356 pb_adv_pdu_complete(); 357 } 358 } 359 360 static void pb_adv_outgoing_transaction_complete(uint8_t status){ 361 // stop sending 362 pb_adv_msg_out_active = 0; 363 // emit done 364 pb_adv_emit_pdu_sent(status); 365 // keep track of ack'ed transactions 366 pb_adv_msg_out_completed_transaction_nr = pb_adv_msg_out_transaction_nr; 367 // increment outgoing transaction nr 368 pb_adv_msg_out_transaction_nr++; 369 if (pb_adv_msg_out_transaction_nr == 0x00){ 370 // Device role 371 pb_adv_msg_out_transaction_nr = 0x80; 372 } 373 if (pb_adv_msg_out_transaction_nr == 0x80){ 374 // Provisioner role 375 pb_adv_msg_out_transaction_nr = 0x00; 376 } 377 } 378 379 static void pb_adv_handle_transaction_ack(uint8_t transaction_nr, const uint8_t * pdu, uint16_t size){ 380 UNUSED(pdu); 381 UNUSED(size); 382 if (transaction_nr == pb_adv_msg_out_transaction_nr){ 383 printf("PB-ADV: %02x ACK received\n", transaction_nr); 384 pb_adv_outgoing_transaction_complete(ERROR_CODE_SUCCESS); 385 } else if (transaction_nr == pb_adv_msg_out_completed_transaction_nr){ 386 // Transaction ack received again 387 } else { 388 printf("PB-ADV: %02x unexpected Transaction ACK %x recevied\n", pb_adv_msg_out_transaction_nr, transaction_nr); 389 } 390 } 391 392 static int pb_adv_packet_to_send(void){ 393 return pb_adv_msg_in_send_ack || pb_adv_msg_out_active || (link_state == LINK_STATE_W4_ACK); 394 } 395 396 static void pb_adv_timer_handler(btstack_timer_source_t * ts){ 397 UNUSED(ts); 398 pb_adv_random_delay_active = 0; 399 if (!pb_adv_packet_to_send()) return; 400 adv_bearer_request_can_send_now_for_provisioning_pdu(); 401 } 402 403 static void pb_adv_run(void){ 404 if (!pb_adv_packet_to_send()) return; 405 if (pb_adv_random_delay_active) return; 406 407 // spec recommends 20-50 ms, we use 20-51 ms 408 pb_adv_random_delay_active = 1; 409 uint16_t random_delay_ms = 20 + (pb_adv_random() & 0x1f); 410 log_info("random delay %u ms", random_delay_ms); 411 btstack_run_loop_set_timer_handler(&pb_adv_random_delay_timer, &pb_adv_timer_handler); 412 btstack_run_loop_set_timer(&pb_adv_random_delay_timer, random_delay_ms); 413 btstack_run_loop_add_timer(&pb_adv_random_delay_timer); 414 } 415 416 static void pb_adv_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 417 UNUSED(channel); 418 419 if (packet_type != HCI_EVENT_PACKET) return; 420 const uint8_t * data; 421 uint8_t length; 422 uint32_t link_id; 423 uint8_t transaction_nr; 424 uint8_t generic_provisioning_control; 425 switch(packet[0]){ 426 case GAP_EVENT_ADVERTISING_REPORT: 427 // data starts at offset 12 428 data = &packet[12]; 429 // PDB ADV PDU 430 length = data[0]; 431 432 // validate length field 433 if ((12 + length) > size) return; 434 435 link_id = big_endian_read_32(data, 2); 436 transaction_nr = data[6]; 437 // generic provision PDU 438 generic_provisioning_control = data[7]; 439 mesh_gpcf_format_t generic_provisioning_control_format = (mesh_gpcf_format_t) generic_provisioning_control & 3; 440 441 // unless, we're waiting for LINK_OPEN, check link_id 442 if (link_state != LINK_STATE_W4_OPEN){ 443 if (link_id != pb_adv_link_id) break; 444 } 445 446 if (generic_provisioning_control_format == MESH_GPCF_PROV_BEARER_CONTROL){ 447 pb_adv_handle_bearer_control(link_id, transaction_nr, &data[7], length-6); 448 break; 449 } 450 451 // verify link id and link state 452 if (link_state != LINK_STATE_OPEN) break; 453 454 // stop link establishment timer 455 btstack_run_loop_remove_timer(&pb_adv_link_timeout); 456 457 switch (generic_provisioning_control_format){ 458 case MESH_GPCF_TRANSACTION_START: 459 pb_adv_handle_transaction_start(transaction_nr, &data[7], length-6); 460 break; 461 case MESH_GPCF_TRANSACTION_CONT: 462 pb_adv_handle_transaction_cont(transaction_nr, &data[7], length-6); 463 break; 464 case MESH_GPCF_TRANSACTION_ACK: 465 pb_adv_handle_transaction_ack(transaction_nr, &data[7], length-6); 466 break; 467 default: 468 break; 469 } 470 pb_adv_run(); 471 break; 472 case HCI_EVENT_MESH_META: 473 switch(packet[2]){ 474 case MESH_SUBEVENT_CAN_SEND_NOW: 475 #ifdef ENABLE_MESH_PROVISIONER 476 if (link_state == LINK_STATE_W4_ACK){ 477 pb_adv_provisioner_open_countdown--; 478 if (pb_adv_provisioner_open_countdown == 0){ 479 pb_adv_emit_link_open(ERROR_CODE_PAGE_TIMEOUT, pb_adv_cid); 480 break; 481 } 482 // build packet 483 uint8_t buffer[22]; 484 big_endian_store_32(buffer, 0, pb_adv_link_id); 485 buffer[4] = 0; // Transaction ID = 0 486 buffer[5] = (0 << 2) | 3; // Link Open | Provisioning Bearer Control 487 (void)memcpy(&buffer[6], pb_adv_peer_device_uuid, 16); 488 adv_bearer_send_provisioning_pdu(buffer, sizeof(buffer)); 489 log_info("link open %08x", pb_adv_link_id); 490 printf("PB-ADV: Sending Link Open for device uuid: "); 491 printf_hexdump(pb_adv_peer_device_uuid, 16); 492 btstack_run_loop_set_timer_handler(&pb_adv_random_delay_timer, &pb_adv_timer_handler); 493 btstack_run_loop_set_timer(&pb_adv_random_delay_timer, PB_ADV_LINK_OPEN_RETRANSMIT_MS); 494 btstack_run_loop_add_timer(&pb_adv_random_delay_timer); 495 break; 496 } 497 #endif 498 if (link_state == LINK_STATE_CLOSING){ 499 log_info("link close %08x", pb_adv_link_id); 500 printf("PB-ADV: Sending Link Close %08x\n", pb_adv_link_id); 501 // build packet 502 uint8_t buffer[7]; 503 big_endian_store_32(buffer, 0, pb_adv_link_id); 504 buffer[4] = 0; // Transaction ID = 0 505 buffer[5] = (2 << 2) | 3; // Link Close | Provisioning Bearer Control 506 buffer[6] = pb_adv_link_close_reason; 507 adv_bearer_send_provisioning_pdu(buffer, sizeof(buffer)); 508 pb_adv_link_close_countdown--; 509 if (pb_adv_link_close_countdown) { 510 adv_bearer_request_can_send_now_for_provisioning_pdu(); 511 } else { 512 link_state = LINK_STATE_W4_OPEN; 513 } 514 break; 515 } 516 if (link_state == LINK_STATE_W2_SEND_ACK){ 517 link_state = LINK_STATE_OPEN; 518 pb_adv_msg_out_transaction_nr = 0x80; 519 // build packet 520 uint8_t buffer[6]; 521 big_endian_store_32(buffer, 0, pb_adv_link_id); 522 buffer[4] = 0; 523 buffer[5] = (1 << 2) | 3; // Link Ack | Provisioning Bearer Control 524 adv_bearer_send_provisioning_pdu(buffer, sizeof(buffer)); 525 log_info("link ack %08x", pb_adv_link_id); 526 printf("PB-ADV: Sending Link Open Ack %08x\n", pb_adv_link_id); 527 break; 528 } 529 if (pb_adv_msg_in_send_ack){ 530 pb_adv_msg_in_send_ack = 0; 531 uint8_t buffer[6]; 532 big_endian_store_32(buffer, 0, pb_adv_link_id); 533 buffer[4] = pb_adv_msg_in_transaction_nr_prev; 534 buffer[5] = MESH_GPCF_TRANSACTION_ACK; 535 adv_bearer_send_provisioning_pdu(buffer, sizeof(buffer)); 536 log_info("transaction ack %08x", pb_adv_link_id); 537 printf("PB-ADV: %02x sending ACK\n", pb_adv_msg_in_transaction_nr_prev); 538 pb_adv_run(); 539 break; 540 } 541 if (pb_adv_msg_out_active){ 542 543 // check timeout for outgoing message 544 // since uint32_t is used and time now must be greater than pb_adv_msg_out_start, 545 // this claculation is correct even when the run loop time overruns 546 uint32_t transaction_time_ms = btstack_run_loop_get_time_ms() - pb_adv_msg_out_start; 547 if (transaction_time_ms >= MESH_GENERIC_PROVISIONING_TRANSACTION_TIMEOUT_MS){ 548 pb_adv_outgoing_transaction_complete(ERROR_CODE_CONNECTION_TIMEOUT); 549 return; 550 } 551 552 uint8_t buffer[29]; // ADV MTU 553 big_endian_store_32(buffer, 0, pb_adv_link_id); 554 buffer[4] = pb_adv_msg_out_transaction_nr; 555 uint16_t bytes_left; 556 uint16_t pos; 557 if (pb_adv_msg_out_pos == 0){ 558 // Transaction start 559 int seg_n = pb_adv_msg_out_len / 24; 560 pb_adv_msg_out_seg = 0; 561 buffer[5] = seg_n << 2 | MESH_GPCF_TRANSACTION_START; 562 big_endian_store_16(buffer, 6, pb_adv_msg_out_len); 563 buffer[8] = btstack_crc8_calc((uint8_t*)pb_adv_msg_out_buffer, pb_adv_msg_out_len); 564 pos = 9; 565 bytes_left = 24 - 4; 566 printf("PB-ADV: %02x Sending Start: ", pb_adv_msg_out_transaction_nr); 567 } else { 568 // Transaction continue 569 buffer[5] = pb_adv_msg_out_seg << 2 | MESH_GPCF_TRANSACTION_CONT; 570 pos = 6; 571 bytes_left = 24 - 1; 572 printf("PB-ADV: %02x Sending Cont: ", pb_adv_msg_out_transaction_nr); 573 } 574 pb_adv_msg_out_seg++; 575 uint16_t bytes_to_copy = btstack_min(bytes_left, pb_adv_msg_out_len - pb_adv_msg_out_pos); 576 (void)memcpy(&buffer[pos], 577 &pb_adv_msg_out_buffer[pb_adv_msg_out_pos], 578 bytes_to_copy); 579 pos += bytes_to_copy; 580 printf("bytes %02u, pos %02u, len %02u: ", bytes_to_copy, pb_adv_msg_out_pos, pb_adv_msg_out_len); 581 printf_hexdump(buffer, pos); 582 pb_adv_msg_out_pos += bytes_to_copy; 583 584 if (pb_adv_msg_out_pos == pb_adv_msg_out_len){ 585 // done 586 pb_adv_msg_out_pos = 0; 587 } 588 adv_bearer_send_provisioning_pdu(buffer, pos); 589 pb_adv_run(); 590 break; 591 } 592 break; 593 default: 594 break; 595 } 596 default: 597 break; 598 } 599 } 600 601 void pb_adv_init(void){ 602 adv_bearer_register_for_provisioning_pdu(&pb_adv_handler); 603 pb_adv_lfsr = 0x12345678; 604 pb_adv_random(); 605 } 606 607 void pb_adv_register_packet_handler(btstack_packet_handler_t packet_handler){ 608 pb_adv_packet_handler = packet_handler; 609 } 610 611 void pb_adv_send_pdu(uint16_t pb_transport_cid, const uint8_t * pdu, uint16_t size){ 612 UNUSED(pb_transport_cid); 613 printf("PB-ADV: Send packet "); 614 printf_hexdump(pdu, size); 615 pb_adv_msg_out_buffer = pdu; 616 pb_adv_msg_out_len = size; 617 pb_adv_msg_out_pos = 0; 618 pb_adv_msg_out_start = btstack_run_loop_get_time_ms(); 619 pb_adv_msg_out_active = 1; 620 pb_adv_run(); 621 } 622 623 /** 624 * Close Link 625 * @param pb_transport_cid 626 */ 627 void pb_adv_close_link(uint16_t pb_transport_cid, uint8_t reason){ 628 switch (link_state){ 629 case LINK_STATE_W4_ACK: 630 case LINK_STATE_OPEN: 631 case LINK_STATE_W2_SEND_ACK: 632 pb_adv_emit_link_close(pb_transport_cid, 0); 633 link_state = LINK_STATE_CLOSING; 634 pb_adv_link_close_countdown = 3; 635 pb_adv_link_close_reason = reason; 636 adv_bearer_request_can_send_now_for_provisioning_pdu(); 637 break; 638 case LINK_STATE_W4_OPEN: 639 case LINK_STATE_CLOSING: 640 // nothing to do 641 break; 642 } 643 } 644 645 #ifdef ENABLE_MESH_PROVISIONER 646 uint16_t pb_adv_create_link(const uint8_t * device_uuid){ 647 if (link_state != LINK_STATE_W4_OPEN) return 0; 648 649 pb_adv_peer_device_uuid = device_uuid; 650 pb_adv_provisioner_role = 1; 651 pb_adv_provisioner_open_countdown = PB_ADV_LINK_OPEN_RETRIES; 652 653 // create new 32-bit link id 654 pb_adv_link_id = pb_adv_random(); 655 656 // after sending OPEN, we wait for an ACK 657 link_state = LINK_STATE_W4_ACK; 658 659 // request outgoing 660 adv_bearer_request_can_send_now_for_provisioning_pdu(); 661 662 // dummy pb_adv_cid 663 return pb_adv_cid; 664 } 665 #endif 666 667