1 /* 2 * Copyright (C) 2009 by Matthias Ringwald 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 * 17 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 21 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * l2cap.c 34 * 35 * Logical Link Control and Adaption Protocl (L2CAP) 36 * 37 * Created by Matthias Ringwald on 5/16/09. 38 */ 39 40 #include "l2cap.h" 41 #include "hci.h" 42 43 #include <stdarg.h> 44 #include <string.h> 45 46 #include <stdio.h> 47 48 // size of HCI ACL + L2CAP Header for regular data packets 49 #define COMPLETE_L2CAP_HEADER 8 50 51 static void null_event_handler(uint8_t *packet, uint16_t size); 52 static void null_data_handler(uint16_t source_cid, uint8_t *packet, uint16_t size); 53 54 static uint8_t * sig_buffer = NULL; 55 static linked_list_t l2cap_channels = NULL; 56 static linked_list_t l2cap_services = NULL; 57 static uint8_t * acl_buffer = NULL; 58 static void (*event_packet_handler) (uint8_t *packet, uint16_t size) = null_event_handler; 59 static void (*data_packet_handler) (uint16_t source_cid, uint8_t *packet, uint16_t size) = null_data_handler; 60 static connection_t * capture_connection = NULL; 61 62 static uint8_t config_options[] = { 1, 2, 150, 0}; // mtu = 48 63 64 void l2cap_init(){ 65 sig_buffer = malloc( 48 ); 66 acl_buffer = malloc( 255 + 8 ); 67 68 // 69 // register callbacks with HCI 70 // 71 hci_register_event_packet_handler(&l2cap_event_handler); 72 hci_register_acl_packet_handler(&l2cap_acl_handler); 73 } 74 75 76 /** Register L2CAP packet handlers */ 77 static void null_event_handler(uint8_t *packet, uint16_t size){ 78 } 79 static void null_data_handler(uint16_t source_cid, uint8_t *packet, uint16_t size){ 80 } 81 void l2cap_register_event_packet_handler(void (*handler)(uint8_t *packet, uint16_t size)){ 82 event_packet_handler = handler; 83 } 84 void l2cap_register_data_packet_handler (void (*handler)(uint16_t source_cid, uint8_t *packet, uint16_t size)){ 85 data_packet_handler = handler; 86 } 87 88 int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 89 va_list argptr; 90 va_start(argptr, identifier); 91 uint16_t len = l2cap_create_signaling_internal(sig_buffer, handle, cmd, identifier, argptr); 92 va_end(argptr); 93 return hci_send_acl_packet(sig_buffer, len); 94 } 95 96 l2cap_channel_t * l2cap_get_channel_for_source_cid(uint16_t source_cid){ 97 linked_item_t *it; 98 l2cap_channel_t * channel; 99 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 100 channel = (l2cap_channel_t *) it; 101 if ( channel->source_cid == source_cid) { 102 return channel; 103 } 104 } 105 return NULL; 106 } 107 108 // open outgoing L2CAP channel 109 void l2cap_create_channel_internal(connection_t * connection, bd_addr_t address, uint16_t psm){ 110 111 // alloc structure 112 l2cap_channel_t * chan = malloc(sizeof(l2cap_channel_t)); 113 // TODO: emit error event 114 if (!chan) return; 115 116 // fill in 117 BD_ADDR_COPY(chan->address, address); 118 chan->psm = psm; 119 chan->handle = 0; 120 chan->connection = connection; 121 122 // set initial state 123 chan->state = L2CAP_STATE_CLOSED; 124 chan->sig_id = L2CAP_SIG_ID_INVALID; 125 126 // add to connections list 127 linked_list_add(&l2cap_channels, (linked_item_t *) chan); 128 129 // send connection request 130 // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 131 hci_send_cmd(&hci_create_connection, address, 0x18, 0, 0, 0, 0); 132 } 133 134 void l2cap_disconnect_internal(uint16_t source_cid, uint8_t reason){ 135 // find channel for source_cid 136 l2cap_channel_t * channel = l2cap_get_channel_for_source_cid(source_cid); 137 if (channel) { 138 channel->sig_id = l2cap_next_sig_id(); 139 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->dest_cid, channel->source_cid); 140 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 141 } 142 } 143 144 static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 145 linked_item_t *it; 146 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 147 l2cap_channel_t * channel = (l2cap_channel_t *) it; 148 if ( ! BD_ADDR_CMP( channel->address, address) ){ 149 if (channel->state == L2CAP_STATE_CLOSED) { 150 // failure, forward error code 151 l2cap_emit_channel_opened(channel, status); 152 // discard channel 153 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 154 free (channel); 155 } 156 } 157 } 158 } 159 160 static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 161 linked_item_t *it; 162 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 163 l2cap_channel_t * channel = (l2cap_channel_t *) it; 164 if ( ! BD_ADDR_CMP( channel->address, address) ){ 165 if (channel->state == L2CAP_STATE_CLOSED) { 166 // success, start l2cap handshake 167 channel->handle = handle; 168 channel->sig_id = l2cap_next_sig_id(); 169 channel->source_cid = l2cap_next_source_cid(); 170 channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 171 l2cap_send_signaling_packet( channel->handle, CONNECTION_REQUEST, channel->sig_id, channel->psm, channel->source_cid); 172 } 173 } 174 } 175 } 176 177 void l2cap_event_handler( uint8_t *packet, uint16_t size ){ 178 179 bd_addr_t address; 180 hci_con_handle_t handle; 181 182 switch(packet[0]){ 183 184 // handle connection complete events 185 case HCI_EVENT_CONNECTION_COMPLETE: 186 bt_flip_addr(address, &packet[5]); 187 if (packet[2] == 0){ 188 handle = READ_BT_16(packet, 3); 189 l2cap_handle_connection_success_for_addr(address, handle); 190 } else { 191 l2cap_handle_connection_failed_for_addr(address, packet[2]); 192 } 193 break; 194 195 // handle successful create connection cancel command 196 case HCI_EVENT_COMMAND_COMPLETE: 197 if ( COMMAND_COMPLETE_EVENT(packet, hci_create_connection_cancel) ) { 198 if (packet[5] == 0){ 199 bt_flip_addr(address, &packet[6]); 200 // CONNECTION TERMINATED BY LOCAL HOST (0X16) 201 l2cap_handle_connection_failed_for_addr(address, 0x16); 202 } 203 } 204 break; 205 206 // handle disconnection complete events 207 case HCI_EVENT_DISCONNECTION_COMPLETE: 208 // send l2cap disconnect events for all channels on this handle 209 handle = READ_BT_16(packet, 3); 210 linked_item_t *it; 211 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 212 l2cap_channel_t * channel = (l2cap_channel_t *) it; 213 if ( channel->handle == handle ){ 214 l2cap_finialize_channel_close(channel); 215 } 216 } 217 break; 218 219 // HCI Connection Timeouts 220 case L2CAP_EVENT_TIMEOUT_CHECK: 221 if (!capture_connection){ 222 hci_con_handle_t handle = READ_BT_16(packet, 2); 223 linked_item_t *it; 224 l2cap_channel_t * channel; 225 int used = 0; 226 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 227 channel = (l2cap_channel_t *) it; 228 if (channel->handle == handle) { 229 used = 1; 230 } 231 } 232 if (!used) { 233 hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 234 } 235 } 236 break; 237 238 default: 239 break; 240 } 241 242 // pass on 243 (*event_packet_handler)(packet, size); 244 } 245 246 static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 247 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_RESPONSE, identifier, channel->dest_cid, channel->source_cid); 248 l2cap_finialize_channel_close(channel); 249 } 250 251 static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t dest_cid){ 252 253 // printf("l2cap_handle_connection_request for handle %u, psm %u cid %u\n", handle, psm, dest_cid); 254 l2cap_service_t *service = l2cap_get_service(psm); 255 if (!service) { 256 // 0x0002 PSM not supported 257 // printf("l2cap_handle_connection_request no PSM for psm %u/n", psm); 258 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, 0x0002, 0); 259 return; 260 } 261 262 hci_connection_t * hci_connection = connection_for_handle( handle ); 263 if (!hci_connection) { 264 fprintf(stderr, "no hci_connection for handle %u\n", handle); 265 // TODO: emit error 266 return; 267 } 268 269 // alloc structure 270 // printf("l2cap_handle_connection_request register channel\n"); 271 l2cap_channel_t * channel = malloc(sizeof(l2cap_channel_t)); 272 // TODO: emit error event 273 if (!channel) return; 274 275 // fill in 276 BD_ADDR_COPY(channel->address, hci_connection->address); 277 channel->psm = psm; 278 channel->handle = handle; 279 channel->connection = service->connection; 280 channel->source_cid = l2cap_next_source_cid(); 281 channel->dest_cid = dest_cid; 282 283 // set initial state 284 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 285 channel->sig_id = l2cap_next_sig_id(); 286 287 // add to connections list 288 linked_list_add(&l2cap_channels, (linked_item_t *) channel); 289 290 // TODO: emit incoming connection request instead of answering directly 291 292 l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, dest_cid, channel->source_cid, 0, 0); 293 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->dest_cid, 0, 4, &config_options); 294 295 } 296 297 void l2cap_signaling_handler(l2cap_channel_t *channel, uint8_t *packet, uint16_t size){ 298 299 uint8_t code = READ_L2CAP_SIGNALING_CODE( packet ); 300 uint8_t identifier = READ_L2CAP_SIGNALING_IDENTIFIER( packet ); 301 uint16_t result = 0; 302 303 switch (channel->state) { 304 305 case L2CAP_STATE_WAIT_CONNECT_RSP: 306 switch (code){ 307 case CONNECTION_RESPONSE: 308 result = READ_BT_16 (packet, L2CAP_SIGNALING_DATA_OFFSET+4); 309 switch (result) { 310 case 0: 311 // successful connection 312 channel->dest_cid = READ_BT_16(packet, L2CAP_SIGNALING_DATA_OFFSET); 313 channel->sig_id = l2cap_next_sig_id(); 314 l2cap_send_signaling_packet(channel->handle, CONFIGURE_REQUEST, channel->sig_id, channel->dest_cid, 0, 4, &config_options); 315 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ; 316 break; 317 case 1: 318 // connection pending. get some coffee 319 break; 320 default: 321 // map l2cap connection response result to BTstack status enumeration 322 l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 323 break; 324 } 325 break; 326 327 case DISCONNECTION_REQUEST: 328 l2cap_handle_disconnect_request(channel, identifier); 329 break; 330 331 default: 332 //@TODO: implement other signaling packets 333 break; 334 } 335 break; 336 337 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP_OR_CONFIG_REQ: 338 switch (code) { 339 case CONFIGURE_RESPONSE: 340 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ; 341 break; 342 case CONFIGURE_REQUEST: 343 // accept the other's configuration options 344 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->dest_cid, 0, 0, size - 16, &packet[16]); 345 channel->state = L2CAP_STATE_WAIT_CONFIG_REQ_RSP; 346 break; 347 case DISCONNECTION_REQUEST: 348 l2cap_handle_disconnect_request(channel, identifier); 349 break; 350 default: 351 //@TODO: implement other signaling packets 352 break; 353 } 354 break; 355 356 case L2CAP_STATE_WAIT_CONFIG_REQ: 357 switch (code) { 358 case CONFIGURE_REQUEST: 359 // accept the other's configuration options 360 l2cap_send_signaling_packet(channel->handle, CONFIGURE_RESPONSE, identifier, channel->dest_cid, 0, 0, size - 16, &packet[16]); 361 channel->state = L2CAP_STATE_OPEN; 362 l2cap_emit_channel_opened(channel, 0); // success 363 break; 364 case DISCONNECTION_REQUEST: 365 l2cap_handle_disconnect_request(channel, identifier); 366 break; 367 default: 368 //@TODO: implement other signaling packets 369 break; 370 } 371 break; 372 373 case L2CAP_STATE_WAIT_CONFIG_REQ_RSP: 374 switch (code) { 375 case CONFIGURE_RESPONSE: 376 channel->state = L2CAP_STATE_OPEN; 377 l2cap_emit_channel_opened(channel, 0); // success 378 break; 379 case DISCONNECTION_REQUEST: 380 l2cap_handle_disconnect_request(channel, identifier); 381 break; 382 default: 383 //@TODO: implement other signaling packets 384 break; 385 } 386 break; 387 388 case L2CAP_STATE_WAIT_DISCONNECT: 389 switch (code) { 390 case DISCONNECTION_RESPONSE: 391 l2cap_finialize_channel_close(channel); 392 break; 393 case DISCONNECTION_REQUEST: 394 l2cap_handle_disconnect_request(channel, identifier); 395 break; 396 default: 397 //@TODO: implement other signaling packets 398 break; 399 } 400 break; 401 402 case L2CAP_STATE_CLOSED: 403 // @TODO handle incoming requests 404 break; 405 406 case L2CAP_STATE_OPEN: 407 switch (code) { 408 case DISCONNECTION_REQUEST: 409 l2cap_handle_disconnect_request(channel, identifier); 410 break; 411 default: 412 //@TODO: implement other signaling packets, e.g. re-configure 413 break; 414 } 415 break; 416 } 417 } 418 419 // finalize closed channel 420 void l2cap_finialize_channel_close(l2cap_channel_t *channel){ 421 channel->state = L2CAP_STATE_CLOSED; 422 l2cap_emit_channel_closed(channel); 423 424 // discard channel 425 linked_list_remove(&l2cap_channels, (linked_item_t *) channel); 426 free (channel); 427 } 428 429 l2cap_service_t * l2cap_get_service(uint16_t psm){ 430 linked_item_t *it; 431 432 // close open channels 433 for (it = (linked_item_t *) l2cap_services; it ; it = it->next){ 434 l2cap_service_t * service = ((l2cap_service_t *) it); 435 if ( service->psm == psm){ 436 return service; 437 }; 438 } 439 return NULL; 440 } 441 442 void l2cap_register_service_internal(connection_t *connection, uint16_t psm, uint16_t mtu){ 443 // check for alread registered psm // TODO: emit error event 444 l2cap_service_t *service = l2cap_get_service(psm); 445 if (service) return; 446 447 // alloc structure // TODO: emit error event 448 service = malloc(sizeof(l2cap_service_t)); 449 if (!service) return; 450 451 // fill in 452 service->psm = psm; 453 service->mtu = mtu; 454 service->connection = connection; 455 456 // add to services list 457 linked_list_add(&l2cap_services, (linked_item_t *) service); 458 } 459 460 void l2cap_unregister_service_internal(connection_t *connection, uint16_t psm){ 461 l2cap_service_t *service = l2cap_get_service(psm); 462 if (service) return; 463 linked_list_remove(&l2cap_services, (linked_item_t *) service); 464 free( service ); 465 } 466 467 // 468 void l2cap_close_connection(connection_t *connection){ 469 linked_item_t *it; 470 471 // close open channels 472 l2cap_channel_t * channel; 473 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 474 channel = (l2cap_channel_t *) it; 475 if (channel->connection == connection) { 476 channel->sig_id = l2cap_next_sig_id(); 477 l2cap_send_signaling_packet( channel->handle, DISCONNECTION_REQUEST, channel->sig_id, channel->dest_cid, channel->source_cid); 478 channel->state = L2CAP_STATE_WAIT_DISCONNECT; 479 } 480 } 481 482 // unregister services 483 l2cap_service_t *service; 484 for (it = (linked_item_t *) &l2cap_services; it ; it = it->next){ 485 channel = (l2cap_channel_t *) it->next; 486 if (service->connection == connection){ 487 it->next = it->next->next; 488 return; 489 } 490 } 491 } 492 493 void l2cap_accept_connection_internal(hci_con_handle_t handle, uint16_t dest_cid){ 494 printf("l2cap_accept_connection_internal called but not implemented yet 0x%x, 0x%x\n", handle, dest_cid); 495 } 496 497 void l2cap_decline_connection_internal(hci_con_handle_t handle, uint16_t dest_cid, uint8_t reason){ 498 printf("l2cap_decline_connection_internal called but not implemented yet 0x%x, 0x%x, %u", handle, dest_cid,reason); 499 } 500 501 // notify client 502 void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 503 uint8_t event[17]; 504 event[0] = L2CAP_EVENT_CHANNEL_OPENED; 505 event[1] = sizeof(event) - 2; 506 event[2] = status; 507 bt_flip_addr(&event[3], channel->address); 508 bt_store_16(event, 9, channel->handle); 509 bt_store_16(event, 11, channel->psm); 510 bt_store_16(event, 13, channel->source_cid); 511 bt_store_16(event, 15, channel->dest_cid); 512 socket_connection_send_packet(channel->connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 513 } 514 515 void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 516 uint8_t event[4]; 517 event[0] = L2CAP_EVENT_CHANNEL_CLOSED; 518 event[1] = sizeof(event) - 2; 519 bt_store_16(event, 2, channel->source_cid); 520 socket_connection_send_packet(channel->connection, HCI_EVENT_PACKET, 0, event, sizeof(event)); 521 } 522 523 void l2cap_acl_handler( uint8_t *packet, uint16_t size ){ 524 525 // Capturing? 526 if (capture_connection) { 527 socket_connection_send_packet(capture_connection, HCI_ACL_DATA_PACKET, 0, packet, size); 528 return; 529 } 530 531 // forward to higher layers - not needed yet 532 // (*data_packet_handler)(channel_id, packet, size); 533 534 // Get Channel ID and command code 535 uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 536 uint8_t code = READ_L2CAP_SIGNALING_CODE( packet ); 537 538 // Get Connection 539 hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 540 541 // printf("l2cap_acl_handler channel %u, code %u\n", channel_id, code); 542 543 // Signaling Packet? 544 if (channel_id == 1) { 545 546 if (code < 1 || code >= 8){ 547 // not for a particular channel, and not CONNECTION_REQUEST 548 return; 549 } 550 551 // Get Signaling Identifier 552 uint8_t sig_id = READ_L2CAP_SIGNALING_IDENTIFIER(packet); 553 554 // CONNECTION_REQUEST 555 if (code == CONNECTION_REQUEST){ 556 uint16_t psm = READ_BT_16(packet, L2CAP_SIGNALING_DATA_OFFSET); 557 uint16_t dest_cid = READ_BT_16(packet, L2CAP_SIGNALING_DATA_OFFSET+2); 558 l2cap_handle_connection_request(handle, sig_id, psm, dest_cid); 559 return; 560 } 561 562 // Get potential destination CID 563 uint16_t dest_cid = READ_BT_16(packet, L2CAP_SIGNALING_DATA_OFFSET); 564 565 // Find channel for this sig_id and connection handle 566 linked_item_t *it; 567 for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){ 568 l2cap_channel_t * channel = (l2cap_channel_t *) it; 569 if (channel->handle == handle) { 570 if (code & 1) { 571 // match odd commands by previous signaling identifier 572 if (channel->sig_id == sig_id) { 573 l2cap_signaling_handler( channel, packet, size); 574 } 575 } else { 576 // match even commands by source channel id 577 if (channel->source_cid == dest_cid) { 578 l2cap_signaling_handler( channel, packet, size); 579 } 580 } 581 } 582 } 583 return; 584 } 585 586 // Find channel for this channel_id and connection handle 587 l2cap_channel_t * channel = l2cap_get_channel_for_source_cid(channel_id); 588 if (channel) { 589 socket_connection_send_packet(channel->connection, L2CAP_DATA_PACKET, channel_id, 590 &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 591 } 592 } 593 594 595 void l2cap_send_internal(uint16_t source_cid, uint8_t *data, uint16_t len){ 596 // find channel for source_cid, construct l2cap packet and send 597 l2cap_channel_t * channel = l2cap_get_channel_for_source_cid(source_cid); 598 if (channel) { 599 // 0 - Connection handle : PB=10 : BC=00 600 bt_store_16(acl_buffer, 0, channel->handle | (2 << 12) | (0 << 14)); 601 // 2 - ACL length 602 bt_store_16(acl_buffer, 2, len + 4); 603 // 4 - L2CAP packet length 604 bt_store_16(acl_buffer, 4, len + 0); 605 // 6 - L2CAP channel DEST 606 bt_store_16(acl_buffer, 6, channel->dest_cid); 607 // 8 - data 608 memcpy(&acl_buffer[8], data, len); 609 // send 610 hci_send_acl_packet(acl_buffer, len+8); 611 } 612 } 613 614 void l2cap_set_capture_connection(connection_t * connection){ 615 capture_connection = connection; 616 } 617 618