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 * hci.c 34 * 35 * Created by Matthias Ringwald on 4/29/09. 36 * 37 */ 38 39 #include "hci.h" 40 41 #include <unistd.h> 42 #include <stdarg.h> 43 #include <string.h> 44 #include <stdio.h> 45 46 #include "debug.h" 47 #include "hci_dump.h" 48 49 #include "../include/btstack/hci_cmds.h" 50 #include "../include/btstack/version.h" 51 52 // temp 53 #include "l2cap.h" 54 55 #define HCI_CONNECTION_TIMEOUT_MS 10000 56 57 // the STACK is here 58 static hci_stack_t hci_stack; 59 60 /** 61 * get connection for a given handle 62 * 63 * @return connection OR NULL, if not found 64 */ 65 hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){ 66 linked_item_t *it; 67 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 68 if ( ((hci_connection_t *) it)->con_handle == con_handle){ 69 return (hci_connection_t *) it; 70 } 71 } 72 return NULL; 73 } 74 75 static void hci_connection_timeout_handler(timer_source_t *timer){ 76 hci_connection_t * connection = linked_item_get_user(&timer->item); 77 struct timeval tv; 78 gettimeofday(&tv, NULL); 79 if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) { 80 // connections might be timed out 81 hci_emit_l2cap_check_timeout(connection); 82 run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS); 83 } else { 84 // next timeout check at 85 timer->timeout.tv_sec = connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000; 86 } 87 run_loop_add_timer(timer); 88 } 89 90 static void hci_connection_timestamp(hci_connection_t *connection){ 91 gettimeofday(&connection->timestamp, NULL); 92 } 93 94 /** 95 * create connection for given address 96 * 97 * @return connection OR NULL, if not found 98 */ 99 static hci_connection_t * create_connection_for_addr(bd_addr_t addr){ 100 hci_connection_t * conn = malloc( sizeof(hci_connection_t) ); 101 if (!conn) return NULL; 102 BD_ADDR_COPY(conn->address, addr); 103 conn->con_handle = 0xffff; 104 conn->flags = 0; 105 linked_item_set_user(&conn->timeout.item, conn); 106 conn->timeout.process = hci_connection_timeout_handler; 107 hci_connection_timestamp(conn); 108 conn->acl_recombination_length = 0; 109 conn->acl_recombination_pos = 0; 110 conn->num_acl_packets_sent = 0; 111 linked_list_add(&hci_stack.connections, (linked_item_t *) conn); 112 return conn; 113 } 114 115 /** 116 * get connection for given address 117 * 118 * @return connection OR NULL, if not found 119 */ 120 static hci_connection_t * connection_for_address(bd_addr_t address){ 121 linked_item_t *it; 122 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 123 if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){ 124 return (hci_connection_t *) it; 125 } 126 } 127 return NULL; 128 } 129 130 /** 131 * count connections 132 */ 133 static int nr_hci_connections(){ 134 int count = 0; 135 linked_item_t *it; 136 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++); 137 return count; 138 } 139 140 /** 141 * Dummy handler called by HCI 142 */ 143 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 144 } 145 146 uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){ 147 hci_connection_t * connection = connection_for_handle(handle); 148 if (!connection) { 149 log_err("hci_number_outgoing_packets connectino for handle %u does not exist!\n", handle); 150 return 0; 151 } 152 return connection->num_acl_packets_sent; 153 } 154 155 uint8_t hci_number_free_acl_slots(){ 156 uint8_t free_slots = hci_stack.total_num_acl_packets; 157 linked_item_t *it; 158 for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){ 159 hci_connection_t * connection = (hci_connection_t *) it; 160 if (free_slots < connection->num_acl_packets_sent) { 161 log_err("hci_number_free_acl_slots: sum of outgoing packets > total acl packets!\n"); 162 return 0; 163 } 164 free_slots -= connection->num_acl_packets_sent; 165 } 166 return free_slots; 167 } 168 169 int hci_ready_to_send(hci_con_handle_t handle){ 170 return hci_number_free_acl_slots() && hci_number_outgoing_packets(handle) < 2; 171 } 172 173 int hci_send_acl_packet(uint8_t *packet, int size){ 174 175 // check for free places on BT module 176 if (!hci_number_free_acl_slots()) return -1; 177 178 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 179 hci_connection_t *connection = connection_for_handle( con_handle); 180 if (!connection) return 0; 181 hci_connection_timestamp(connection); 182 183 // count packet 184 connection->num_acl_packets_sent++; 185 // log_dbg("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent); 186 187 // send packet - ignore errors 188 hci_stack.hci_transport->send_acl_packet(packet, size); 189 190 return 0; 191 } 192 193 static void acl_handler(uint8_t *packet, int size){ 194 195 // get info 196 hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet); 197 hci_connection_t *conn = connection_for_handle(con_handle); 198 uint8_t acl_flags = READ_ACL_FLAGS(packet); 199 uint16_t acl_length = READ_ACL_LENGTH(packet); 200 201 // ignore non-registered handle 202 if (!conn){ 203 log_err( "hci.c: acl_handler called with non-registered handle %u!\n" , con_handle); 204 return; 205 } 206 207 // update idle timestamp 208 hci_connection_timestamp(conn); 209 210 // handle different packet types 211 switch (acl_flags & 0x03) { 212 213 case 0x01: // continuation fragment 214 215 // sanity check 216 if (conn->acl_recombination_pos == 0) { 217 log_err( "ACL Cont Fragment but no first fragment for handle 0x%02x\n", con_handle); 218 return; 219 } 220 221 // append fragment payload (header already stored) 222 memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length ); 223 conn->acl_recombination_pos += acl_length; 224 225 // log_err( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u\n", 226 // acl_length, connection->acl_recombination_pos, connection->acl_recombination_length); 227 228 // forward complete L2CAP packet if complete. 229 if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header 230 231 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos); 232 // reset recombination buffer 233 conn->acl_recombination_length = 0; 234 conn->acl_recombination_pos = 0; 235 } 236 break; 237 238 case 0x02: { // first fragment 239 240 // sanity check 241 if (conn->acl_recombination_pos) { 242 log_err( "ACL First Fragment but data in buffer for handle 0x%02x\n", con_handle); 243 return; 244 } 245 246 // peek into L2CAP packet! 247 uint16_t l2cap_length = READ_L2CAP_LENGTH( packet ); 248 249 // compare fragment size to L2CAP packet size 250 if (acl_length >= l2cap_length + 4){ 251 252 // forward fragment as L2CAP packet 253 hci_stack.packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4); 254 255 } else { 256 // store first fragment and tweak acl length for complete package 257 memcpy(conn->acl_recombination_buffer, packet, acl_length + 4); 258 conn->acl_recombination_pos = acl_length + 4; 259 conn->acl_recombination_length = l2cap_length; 260 bt_store_16(conn->acl_recombination_buffer, 2, acl_length +4); 261 // log_err( "ACL First Fragment: acl_len %u, l2cap_len %u\n", acl_length, l2cap_length); 262 } 263 break; 264 265 } 266 default: 267 log_err( "hci.c: acl_handler called with invalid packet boundary flags %u\n", acl_flags & 0x03); 268 return; 269 } 270 271 // execute main loop 272 hci_run(); 273 } 274 275 static void event_handler(uint8_t *packet, int size){ 276 bd_addr_t addr; 277 hci_con_handle_t handle; 278 hci_connection_t * conn; 279 int i; 280 281 // get num_cmd_packets 282 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE || packet[0] == HCI_EVENT_COMMAND_STATUS){ 283 // Get Num_HCI_Command_Packets 284 hci_stack.num_cmd_packets = packet[2]; 285 } 286 287 switch (packet[0]) { 288 289 case HCI_EVENT_COMMAND_COMPLETE: 290 if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){ 291 // from offset 5 292 // status 293 hci_stack.acl_data_packet_length = READ_BT_16(packet, 6); 294 // ignore: SCO data packet len (8) 295 hci_stack.total_num_acl_packets = packet[9]; 296 // ignore: total num SCO packets 297 if (hci_stack.state == HCI_STATE_INITIALIZING){ 298 log_dbg("hci_read_buffer_size: size %u, count %u\n", hci_stack.acl_data_packet_length, hci_stack.total_num_acl_packets); 299 } 300 } 301 break; 302 303 case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 304 for (i=0; i<packet[2];i++){ 305 handle = READ_BT_16(packet, 3 + 2*i); 306 uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i); 307 conn = connection_for_handle(handle); 308 if (!conn){ 309 log_err("hci_number_completed_packet lists unused con handle %u\n", handle); 310 continue; 311 } 312 conn->num_acl_packets_sent -= num_packets; 313 // log_dbg("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent); 314 } 315 break; 316 317 case HCI_EVENT_CONNECTION_REQUEST: 318 bt_flip_addr(addr, &packet[2]); 319 // TODO: eval COD 8-10 320 uint8_t link_type = packet[11]; 321 log_dbg("Connection_incoming: "); print_bd_addr(addr); log_dbg(", type %u\n", link_type); 322 if (link_type == 1) { // ACL 323 conn = connection_for_address(addr); 324 if (!conn) { 325 conn = create_connection_for_addr(addr); 326 } 327 // TODO: check for malloc failure 328 conn->state = ACCEPTED_CONNECTION_REQUEST; 329 hci_send_cmd(&hci_accept_connection_request, addr, 1); 330 } else { 331 // TODO: decline request 332 } 333 break; 334 335 case HCI_EVENT_CONNECTION_COMPLETE: 336 // Connection management 337 bt_flip_addr(addr, &packet[5]); 338 log_dbg("Connection_complete (status=%u)", packet[2]); print_bd_addr(addr); log_dbg("\n"); 339 conn = connection_for_address(addr); 340 if (conn) { 341 if (!packet[2]){ 342 conn->state = OPEN; 343 conn->con_handle = READ_BT_16(packet, 3); 344 conn->flags = 0; 345 346 gettimeofday(&conn->timestamp, NULL); 347 run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS); 348 run_loop_add_timer(&conn->timeout); 349 350 log_dbg("New connection: handle %u, ", conn->con_handle); 351 print_bd_addr( conn->address ); 352 log_dbg("\n"); 353 354 hci_emit_nr_connections_changed(); 355 } else { 356 // connection failed, remove entry 357 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 358 free( conn ); 359 } 360 } 361 break; 362 363 case HCI_EVENT_DISCONNECTION_COMPLETE: 364 if (!packet[2]){ 365 handle = READ_BT_16(packet, 3); 366 hci_connection_t * conn = connection_for_handle(handle); 367 if (conn) { 368 log_dbg("Connection closed: handle %u, ", conn->con_handle); 369 print_bd_addr( conn->address ); 370 log_dbg("\n"); 371 run_loop_remove_timer(&conn->timeout); 372 linked_list_remove(&hci_stack.connections, (linked_item_t *) conn); 373 free( conn ); 374 hci_emit_nr_connections_changed(); 375 } 376 } 377 break; 378 379 default: 380 break; 381 } 382 383 // handle BT initialization 384 if (hci_stack.state == HCI_STATE_INITIALIZING){ 385 // handle H4 synchronization loss on restart 386 // if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){ 387 // hci_stack.substate = 0; 388 // } 389 // handle normal init sequence 390 if (hci_stack.substate % 2){ 391 // odd: waiting for event 392 if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){ 393 hci_stack.substate++; 394 } 395 } 396 } 397 398 hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size); 399 400 // execute main loop 401 hci_run(); 402 } 403 404 void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 405 switch (packet_type) { 406 case HCI_EVENT_PACKET: 407 event_handler(packet, size); 408 break; 409 case HCI_ACL_DATA_PACKET: 410 acl_handler(packet, size); 411 break; 412 default: 413 break; 414 } 415 } 416 417 /** Register HCI packet handlers */ 418 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 419 hci_stack.packet_handler = handler; 420 } 421 422 void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){ 423 424 // reference to use transport layer implementation 425 hci_stack.hci_transport = transport; 426 427 // references to used control implementation 428 hci_stack.control = control; 429 430 // reference to used config 431 hci_stack.config = config; 432 433 // no connections yet 434 hci_stack.connections = NULL; 435 436 // empty cmd buffer 437 hci_stack.hci_cmd_buffer = malloc(3+255); 438 439 // higher level handler 440 hci_stack.packet_handler = dummy_handler; 441 442 // register packet handlers with transport 443 transport->register_packet_handler(&packet_handler); 444 } 445 446 int hci_power_control(HCI_POWER_MODE power_mode){ 447 if (power_mode == HCI_POWER_ON && hci_stack.state == HCI_STATE_OFF) { 448 449 // power on 450 int err = 0; 451 if (hci_stack.control && hci_stack.control->on){ 452 err = (*hci_stack.control->on)(hci_stack.config); 453 } 454 if (err){ 455 log_err( "POWER_ON failed\n"); 456 hci_emit_hci_open_failed(); 457 return err; 458 } 459 460 // open low-level device 461 err = hci_stack.hci_transport->open(hci_stack.config); 462 if (err){ 463 log_err( "HCI_INIT failed, turning Bluetooth off again\n"); 464 if (hci_stack.control && hci_stack.control->off){ 465 (*hci_stack.control->off)(hci_stack.config); 466 } 467 hci_emit_hci_open_failed(); 468 return err; 469 } 470 471 // set up state machine 472 hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent 473 hci_stack.state = HCI_STATE_INITIALIZING; 474 hci_stack.substate = 0; 475 476 } else if (power_mode == HCI_POWER_OFF && hci_stack.state == HCI_STATE_WORKING){ 477 478 // close low-level device 479 hci_stack.hci_transport->close(hci_stack.config); 480 481 // power off 482 if (hci_stack.control && hci_stack.control->off){ 483 (*hci_stack.control->off)(hci_stack.config); 484 } 485 486 // we're off now 487 hci_stack.state = HCI_STATE_OFF; 488 } 489 490 // create internal event 491 hci_emit_state(); 492 493 // trigger next/first action 494 hci_run(); 495 496 return 0; 497 } 498 499 void hci_run(){ 500 switch (hci_stack.state){ 501 case HCI_STATE_INITIALIZING: 502 if (hci_stack.substate % 2) { 503 // odd: waiting for command completion 504 return; 505 } 506 if (hci_stack.num_cmd_packets == 0) { 507 // cannot send command yet 508 return; 509 } 510 switch (hci_stack.substate >> 1){ 511 case 0: 512 hci_send_cmd(&hci_reset); 513 break; 514 case 1: 515 // custom initialization 516 if (hci_stack.control && hci_stack.control->next_command){ 517 uint8_t * cmd = (*hci_stack.control->next_command)(hci_stack.config); 518 if (cmd) { 519 int size = 3 + cmd[2]; 520 hci_stack.hci_transport->send_cmd_packet(cmd, size); 521 break; 522 } 523 } 524 // @NOTE fall through, if no command to send anymore 525 hci_stack.substate += 2; 526 case 2: 527 hci_send_cmd(&hci_read_bd_addr); 528 break; 529 case 3: 530 hci_send_cmd(&hci_read_buffer_size); 531 break; 532 case 4: 533 // ca. 15 sec 534 hci_send_cmd(&hci_write_page_timeout, 0x6000); 535 break; 536 case 5: 537 hci_send_cmd(&hci_write_scan_enable, 3); // 3 inq scan + page scan 538 break; 539 case 6: 540 // done. 541 hci_stack.state = HCI_STATE_WORKING; 542 hci_emit_state(); 543 break; 544 default: 545 break; 546 } 547 hci_stack.substate++; 548 break; 549 default: 550 break; 551 } 552 } 553 554 int hci_send_cmd_packet(uint8_t *packet, int size){ 555 bd_addr_t addr; 556 hci_connection_t * conn; 557 // house-keeping 558 559 // create_connection? 560 if (IS_COMMAND(packet, hci_create_connection)){ 561 bt_flip_addr(addr, &packet[3]); 562 log_dbg("Create_connection to "); print_bd_addr(addr); log_dbg("\n"); 563 conn = connection_for_address(addr); 564 if (conn) { 565 // if connection exists 566 if (conn->state == OPEN) { 567 // if OPEN, emit connection complete command 568 hci_emit_connection_complete(conn); 569 } 570 // otherwise, just ignore 571 return 0; // don't sent packet to controller 572 573 } else{ 574 conn = create_connection_for_addr(addr); 575 if (conn){ 576 // create connection struct and register, state = SENT_CREATE_CONNECTION 577 conn->state = SENT_CREATE_CONNECTION; 578 } 579 } 580 } 581 582 // accept connection 583 584 // reject connection 585 586 // close_connection? 587 // set state = SENT_DISCONNECT 588 589 hci_stack.num_cmd_packets--; 590 return hci_stack.hci_transport->send_cmd_packet(packet, size); 591 } 592 593 /** 594 * pre: numcmds >= 0 - it's allowed to send a command to the controller 595 */ 596 int hci_send_cmd(hci_cmd_t *cmd, ...){ 597 va_list argptr; 598 va_start(argptr, cmd); 599 uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer; 600 uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr); 601 va_end(argptr); 602 return hci_send_cmd_packet(hci_cmd_buffer, size); 603 } 604 605 // Create various non-HCI events. 606 // TODO: generalize, use table similar to hci_create_command 607 608 void hci_emit_state(){ 609 uint8_t len = 3; 610 uint8_t event[len]; 611 event[0] = BTSTACK_EVENT_STATE; 612 event[1] = len - 3; 613 event[2] = hci_stack.state; 614 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 615 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 616 } 617 618 void hci_emit_connection_complete(hci_connection_t *conn){ 619 uint8_t len = 13; 620 uint8_t event[len]; 621 event[0] = HCI_EVENT_CONNECTION_COMPLETE; 622 event[1] = len - 3; 623 event[2] = 0; // status = OK 624 bt_store_16(event, 3, conn->con_handle); 625 bt_flip_addr(&event[5], conn->address); 626 event[11] = 1; // ACL connection 627 event[12] = 0; // encryption disabled 628 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 629 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 630 } 631 632 void hci_emit_l2cap_check_timeout(hci_connection_t *conn){ 633 uint8_t len = 4; 634 uint8_t event[len]; 635 event[0] = L2CAP_EVENT_TIMEOUT_CHECK; 636 event[1] = len - 2; 637 bt_store_16(event, 2, conn->con_handle); 638 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 639 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 640 } 641 642 void hci_emit_nr_connections_changed(){ 643 uint8_t len = 3; 644 uint8_t event[len]; 645 event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED; 646 event[1] = len - 2; 647 event[2] = nr_hci_connections(); 648 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 649 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 650 } 651 652 void hci_emit_hci_open_failed(){ 653 uint8_t len = 2; 654 uint8_t event[len]; 655 event[0] = BTSTACK_EVENT_POWERON_FAILED; 656 event[1] = len - 2; 657 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 658 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 659 } 660 661 662 void hci_emit_btstack_version() { 663 uint8_t len = 6; 664 uint8_t event[len]; 665 event[0] = BTSTACK_EVENT_VERSION; 666 event[1] = len - 2; 667 event[len++] = BTSTACK_MAJOR; 668 event[len++] = BTSTACK_MINOR; 669 bt_store_16(event, len, BTSTACK_REVISION); 670 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 671 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 672 } 673 674 void hci_emit_system_bluetooth_enabled(uint8_t enabled){ 675 uint8_t len = 3; 676 uint8_t event[len]; 677 event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED; 678 event[1] = len - 2; 679 event[2] = enabled; 680 hci_dump_packet( HCI_EVENT_PACKET, 0, event, len); 681 hci_stack.packet_handler(HCI_EVENT_PACKET, event, len); 682 } 683