1 /* 2 * Copyright (C) 2016 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__ "avrcp_browsing_client.c" 39 40 /* 41 * avrcp_browsing_client.c 42 */ 43 44 // ***************************************************************************** 45 /* EXAMPLE_START(avrcp_browsing_client): Browse media players and media information on a remote device. 46 * 47 * @text This example demonstrates how to use the AVRCP Controller Browsing service to 48 * browse madia players and media information on a remote AVRCP Source device. 49 * 50 * @test To test with a remote device, e.g. a mobile phone, 51 * pair from the remote device with the demo, then use the UI for browsing (tap 52 * SPACE on the console to show the available AVRCP commands). 53 * 54 */ 55 // ***************************************************************************** 56 57 #include <stdint.h> 58 #include <inttypes.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "btstack.h" 64 65 #ifdef HAVE_BTSTACK_STDIN 66 #include "btstack_stdin.h" 67 #endif 68 69 #define AVRCP_BROWSING_MAX_PLAYERS 10 70 #define AVRCP_BROWSING_MAX_FOLDERS 10 71 #define AVRCP_BROWSING_MAX_FOLDER_NAME_LEN 30 72 73 #ifdef HAVE_BTSTACK_STDIN 74 // mac 2011: static bd_addr_t remote = {0x04, 0x0C, 0xCE, 0xE4, 0x85, 0xD3}; 75 // pts: static bd_addr_t remote = {0x00, 0x1B, 0xDC, 0x08, 0x0A, 0xA5}; 76 // mac 2013: 77 // static const char * device_addr_string = "84:38:35:65:d1:15"; 78 // iPhone 5S: static const char * device_addr_string = "54:E4:3A:26:A2:39"; 79 // phone 2013: 80 // static const char * device_addr_string = "B0:34:95:CB:97:C4"; 81 82 static const char * device_addr_string = "B0:34:95:CB:97:C4"; 83 84 static bd_addr_t device_addr; 85 #endif 86 87 static uint16_t avrcp_cid = 0; 88 static uint8_t avrcp_connected = 0; 89 90 static uint16_t browsing_cid = 0; 91 static uint8_t avrcp_browsing_connected = 0; 92 static uint8_t sdp_avrcp_browsing_controller_service_buffer[200]; 93 94 static uint8_t browsing_query_active = 0; 95 static avrcp_media_item_context_t media_item_context; 96 97 typedef struct { 98 uint16_t charset; 99 uint8_t depth; 100 uint16_t name_len; 101 char name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 102 } avrcp_browsing_root_folder_t; 103 104 typedef struct { 105 uint8_t uid[8]; 106 uint16_t name_len; 107 char name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 108 } avrcp_browsing_folders_t; 109 110 static uint8_t parent_folder_set = 0; 111 static uint8_t parent_folder_uid[8]; 112 static char parent_folder_name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 113 static avrcp_browsing_folders_t folders[AVRCP_BROWSING_MAX_FOLDERS]; 114 static int folder_index = -1; 115 static uint16_t players[AVRCP_BROWSING_MAX_PLAYERS]; 116 static int player_index = -1; 117 static uint16_t browsing_uid_counter = 0; 118 119 static btstack_packet_callback_registration_t hci_event_callback_registration; 120 121 static uint8_t ertm_buffer[10000]; 122 static l2cap_ertm_config_t ertm_config = { 123 1, // ertm mandatory 124 2, // max transmit, some tests require > 1 125 2000, 126 12000, 127 144, // l2cap ertm mtu 128 4, 129 4, 130 }; 131 132 133 static inline int next_index(int * index, int max_value){ 134 if ((*index) < max_value){ 135 (*index)++; 136 } else { 137 (*index) = 0; 138 } 139 return (*index); 140 } 141 142 static int next_folder_index(){ 143 return next_index(&folder_index, AVRCP_BROWSING_MAX_FOLDERS); 144 } 145 146 static int next_player_index(){ 147 return next_index(&player_index, AVRCP_BROWSING_MAX_PLAYERS); 148 } 149 150 151 /* @section Main Application Setup 152 * 153 * @text The Listing MainConfiguration shows how to setup AVRCP Controller Browsing service. 154 * To announce AVRCP Controller Browsing service, you need to create corresponding 155 * SDP record and register it with the SDP service. 156 * You'll also need to register several packet handlers: 157 * - stdin_process callback - used to trigger AVRCP commands, such are get media players, playlists, albums, etc. Requires HAVE_BTSTACK_STDIN. 158 * - avrcp_browsing_controller_packet_handler - used to receive answers for AVRCP commands. 159 * 160 */ 161 162 /* LISTING_START(MainConfiguration): Setup Audio Sink and AVRCP Controller services */ 163 static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 164 #ifdef HAVE_BTSTACK_STDIN 165 static void stdin_process(char cmd); 166 #endif 167 168 #define BROWSING_ENABLED 1 169 170 int btstack_main(int argc, const char * argv[]); 171 int btstack_main(int argc, const char * argv[]){ 172 (void)argc; 173 (void)argv; 174 175 // Initialize L2CAP. 176 l2cap_init(); 177 178 // Initialize AVRCP Controller. 179 avrcp_controller_init(); 180 181 // Initialize AVRCP Browsing Controller, HCI events will be sent to the AVRCP Controller callback. 182 avrcp_browsing_controller_init(); 183 // // Register AVRCP for HCI events. 184 avrcp_browsing_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler); 185 186 // Initialize SDP. 187 sdp_init(); 188 189 // Create AVRCP service record and register it with SDP. 190 memset(sdp_avrcp_browsing_controller_service_buffer, 0, sizeof(sdp_avrcp_browsing_controller_service_buffer)); 191 avrcp_controller_create_sdp_record(sdp_avrcp_browsing_controller_service_buffer, 0x10001, BROWSING_ENABLED, 1, NULL, NULL); 192 sdp_register_service(sdp_avrcp_browsing_controller_service_buffer); 193 194 // Set local name with a template Bluetooth address, that will be automatically 195 // replaced with a actual address once it is available, i.e. when BTstack boots 196 // up and starts talking to a Bluetooth module. 197 gap_set_local_name("AVRCP Browsing Client 00:00:00:00:00:00"); 198 gap_discoverable_control(1); 199 gap_set_class_of_device(0x200408); 200 201 // Register for HCI events. 202 hci_event_callback_registration.callback = &avrcp_browsing_controller_packet_handler; 203 hci_add_event_handler(&hci_event_callback_registration); 204 205 // Register for AVRCP events. 206 avrcp_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler); 207 208 209 #ifdef HAVE_BTSTACK_STDIN 210 // Parse human readable Bluetooth address. 211 sscanf_bd_addr(device_addr_string, device_addr); 212 btstack_stdin_setup(stdin_process); 213 #endif 214 printf("Starting BTstack ...\n"); 215 hci_power_control(HCI_POWER_ON); 216 return 0; 217 } 218 /* LISTING_END */ 219 220 static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 221 UNUSED(channel); 222 int pos; 223 224 switch(packet_type){ 225 case AVRCP_BROWSING_DATA_PACKET: 226 pos = 0; 227 browsing_query_active = 1; 228 avrcp_browsing_item_type_t data_type = (avrcp_browsing_item_type_t)packet[pos++]; 229 pos += 2; // length 230 231 switch (data_type){ 232 case AVRCP_BROWSING_MEDIA_ROOT_FOLDER:{ 233 avrcp_browsing_root_folder_t root_folder; 234 root_folder.charset = big_endian_read_16(packet, pos); 235 pos += 2; 236 root_folder.depth = packet[pos++]; 237 root_folder.name_len = big_endian_read_16(packet, pos); 238 pos += 2; 239 240 memset(root_folder.name, 0, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN); 241 root_folder.name_len = btstack_min(big_endian_read_16(packet, pos), AVRCP_BROWSING_MAX_FOLDER_NAME_LEN - 1); 242 memcpy(root_folder.name, packet+pos, root_folder.name_len); 243 printf("Found root folder: name %s, depth %d \n", (char *)root_folder.name, root_folder.depth); 244 break; 245 } 246 case AVRCP_BROWSING_MEDIA_PLAYER_ITEM:{ 247 printf("Received media player: "); 248 uint16_t player_id = big_endian_read_16(packet, pos); 249 pos += 2; 250 avrcp_browsing_media_player_major_type_t major_type = packet[pos++]; 251 avrcp_browsing_media_player_subtype_t subtype = big_endian_read_32(packet, pos); 252 pos += 4; 253 uint8_t status = packet[pos++]; 254 uint8_t feature_bitmask[16]; 255 memcpy(feature_bitmask, packet, 16); 256 pos += 16; 257 printf("player ID 0x%04x, major_type %d, subtype %d, status %d\n", player_id, major_type, subtype, status); 258 players[next_player_index()] = player_id; 259 break; 260 } 261 case AVRCP_BROWSING_FOLDER_ITEM:{ 262 int index = next_folder_index(); 263 // printf("Found folder [%d]: ", index); 264 memcpy(folders[index].uid, packet+pos, 8); 265 uint32_t folder_uid_high = big_endian_read_32(packet, pos); 266 pos += 4; 267 uint32_t folder_uid_low = big_endian_read_32(packet, pos); 268 pos += 4; 269 avrcp_browsing_folder_type_t folder_type = packet[pos++]; 270 uint8_t is_playable = packet[pos++]; 271 uint16_t charset = big_endian_read_16(packet, pos); 272 pos += 2; 273 uint16_t displayable_name_length = big_endian_read_16(packet, pos); 274 pos += 2; 275 276 char value[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 277 278 memset(value, 0, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN); 279 uint16_t value_len = btstack_min(displayable_name_length, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN - 1); 280 memcpy(value, packet+pos, value_len); 281 282 printf("UID 0x%08" PRIx32 "%08" PRIx32 ", type 0x%02x, is_playable %d, charset 0x%02x, name %s\n", 283 folder_uid_high, folder_uid_low, folder_type, is_playable, charset, value); 284 memcpy(folders[index].name, value, value_len); 285 folders[index].name_len = value_len; 286 break; 287 } 288 case AVRCP_BROWSING_MEDIA_ELEMENT_ITEM:{ 289 printf("Found media: "); 290 291 uint32_t media_uid_high = big_endian_read_32(packet, pos); 292 pos += 4; 293 uint32_t media_uid_low = big_endian_read_32(packet, pos+4); 294 pos += 4; 295 avrcp_browsing_media_type_t media_type = packet[pos++]; 296 uint16_t charset = big_endian_read_16(packet, pos); 297 pos += 2; 298 uint16_t displayable_name_length = big_endian_read_16(packet, pos); 299 pos += 2; 300 pos += displayable_name_length; 301 printf("Media UID: 0x%08" PRIx32 "%08" PRIx32 ", media_type 0x%02x, charset 0x%02x, displayable_name_length %d\n", media_uid_high, media_uid_low, media_type, charset, displayable_name_length); 302 303 uint8_t num_attributes = packet[pos++]; 304 printf("Num media attributes %d\n", num_attributes); 305 306 for (avrcp_media_item_iterator_init(&media_item_context, size-pos, packet+pos); avrcp_media_item_iterator_has_more(&media_item_context); avrcp_media_item_iterator_next(&media_item_context)){ 307 uint32_t attr_id = avrcp_media_item_iterator_get_attr_id(&media_item_context); 308 uint16_t attr_charset = avrcp_media_item_iterator_get_attr_charset(&media_item_context); 309 uint16_t attr_value_length = avrcp_media_item_iterator_get_attr_value_len(&media_item_context); 310 const uint8_t * attr_value = avrcp_media_item_iterator_get_attr_value(&media_item_context); 311 312 printf("Attr ID 0x%08" PRIx32 ", charset %d, attr_value_length %d, value %s", attr_id, attr_charset, attr_value_length, attr_value); 313 } 314 break; 315 } 316 317 default: 318 log_error("AVRCP browsing: unknown browsable item type 0%02x", data_type); 319 break; 320 } 321 break; 322 case HCI_EVENT_PACKET: 323 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; 324 uint16_t local_cid; 325 uint8_t status = 0xFF; 326 bd_addr_t address; 327 328 if (packet[0] != HCI_EVENT_AVRCP_META) break; 329 switch (packet[2]){ 330 case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: { 331 local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet); 332 printf("AVRCP_SUBEVENT_CONNECTION_ESTABLISHED cid 0x%02x\n", local_cid); 333 334 if (avrcp_cid != 0 && avrcp_cid != local_cid) { 335 printf("AVRCP Controller connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", avrcp_cid, local_cid); 336 return; 337 } 338 339 status = avrcp_subevent_connection_established_get_status(packet); 340 if (status != ERROR_CODE_SUCCESS){ 341 printf("AVRCP Controller connection failed: status 0x%02x\n", status); 342 avrcp_cid = 0; 343 return; 344 } 345 346 avrcp_cid = local_cid; 347 avrcp_connected = 1; 348 avrcp_subevent_connection_established_get_bd_addr(packet, address); 349 printf("AVRCP Controller connected.\n"); 350 return; 351 } 352 case AVRCP_SUBEVENT_CONNECTION_RELEASED: 353 printf("AVRCP Controller Client released.\n"); 354 avrcp_cid = 0; 355 avrcp_browsing_connected = 0; 356 folder_index = 0; 357 memset(folders, 0, sizeof(folders)); 358 return; 359 360 case AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION: 361 local_cid = avrcp_subevent_incoming_browsing_connection_get_browsing_cid(packet); 362 printf("AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION cid 0x%02x\n", local_cid); 363 if (browsing_cid != 0 && browsing_cid != local_cid) { 364 printf("AVRCP Browsing Client connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid); 365 avrcp_browsing_controller_decline_incoming_connection(browsing_cid); 366 return; 367 } 368 browsing_cid = local_cid; 369 printf("AVRCP Browsing Client configure incoming connection, browsing cid 0x%02x\n", browsing_cid); 370 avrcp_browsing_controller_configure_incoming_connection(browsing_cid, ertm_buffer, sizeof(ertm_buffer), &ertm_config); 371 break; 372 373 case AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED: { 374 local_cid = avrcp_subevent_browsing_connection_established_get_browsing_cid(packet); 375 printf("AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED cid 0x%02x\n", local_cid); 376 if (browsing_cid != 0 && browsing_cid != local_cid) { 377 printf("AVRCP Browsing Client connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid); 378 return; 379 } 380 381 status = avrcp_subevent_browsing_connection_established_get_status(packet); 382 if (status != ERROR_CODE_SUCCESS){ 383 printf("AVRCP Browsing Client connection failed: status 0x%02x\n", status); 384 browsing_cid = 0; 385 return; 386 } 387 388 browsing_cid = local_cid; 389 avrcp_browsing_connected = 1; 390 avrcp_subevent_browsing_connection_established_get_bd_addr(packet, address); 391 printf("AVRCP Browsing Client connected\n"); 392 return; 393 } 394 case AVRCP_SUBEVENT_BROWSING_CONNECTION_RELEASED: 395 printf("AVRCP Browsing Controller released\n"); 396 browsing_cid = 0; 397 avrcp_browsing_connected = 0; 398 return; 399 400 case AVRCP_SUBEVENT_BROWSING_DONE: 401 browsing_query_active = 0; 402 browsing_uid_counter = 0; 403 if (avrcp_subevent_browsing_done_get_browsing_status(packet) != AVRCP_BROWSING_ERROR_CODE_SUCCESS){ 404 printf("AVRCP Browsing query done with browsing status 0x%02x, bluetooth status 0x%02x.\n", 405 avrcp_subevent_browsing_done_get_browsing_status(packet), 406 avrcp_subevent_browsing_done_get_bluetooth_status(packet)); 407 break; 408 } 409 browsing_uid_counter = avrcp_subevent_browsing_done_get_uid_counter(packet); 410 printf("DONE, browsing_uid_counter %d.\n", browsing_uid_counter); 411 break; 412 413 default: 414 break; 415 } 416 break; 417 418 default: 419 break; 420 } 421 422 } 423 424 #ifdef HAVE_BTSTACK_STDIN 425 static void show_usage(void){ 426 bd_addr_t iut_address; 427 gap_local_bd_addr(iut_address); 428 printf("\n--- Bluetooth AVRCP Controller Connection Test Console %s ---\n", bd_addr_to_str(iut_address)); 429 printf("c - AVRCP Controller create connection to addr %s\n", bd_addr_to_str(device_addr)); 430 printf("e - AVRCP Browsing Controller create connection to addr %s\n", bd_addr_to_str(device_addr)); 431 printf("E - AVRCP Browsing Controller disconnect\n"); 432 printf("C - AVRCP Controller disconnect\n"); 433 434 printf("I - Set first found player as addressed player\n"); 435 printf("O - Set first found player as browsed player\n"); 436 437 printf("p - Get media players\n"); 438 printf("Q - Browse folders\n"); 439 printf("P - Go up one level\n"); 440 printf("W - Go down one level\n"); 441 printf("T - Browse media items\n"); 442 printf("---\n"); 443 } 444 #endif 445 446 447 #ifdef HAVE_BTSTACK_STDIN 448 static void stdin_process(char cmd){ 449 uint8_t status = ERROR_CODE_SUCCESS; 450 451 if (cmd != 'a' && cmd != 'A' && cmd != 'c' && cmd != 'C'){ 452 if (browsing_query_active){ 453 printf("Query active, try later!\n"); 454 return; 455 } 456 } 457 458 switch (cmd){ 459 case 'c': 460 printf(" - Create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr)); 461 status = avrcp_controller_connect(device_addr, &avrcp_cid); 462 break; 463 case 'C': 464 if (avrcp_connected){ 465 printf(" - AVRCP Controller disconnect from addr %s.\n", bd_addr_to_str(device_addr)); 466 status = avrcp_controller_disconnect(avrcp_cid); 467 break; 468 } 469 printf("AVRCP Controller already disconnected\n"); 470 break; 471 472 case 'e': 473 if (!avrcp_connected) { 474 printf(" You must first create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr)); 475 break; 476 } 477 printf(" - Create AVRCP connection for browsing to addr %s.\n", bd_addr_to_str(device_addr)); 478 status = avrcp_browsing_controller_connect(device_addr, ertm_buffer, sizeof(ertm_buffer), &ertm_config, &browsing_cid); 479 break; 480 case 'E': 481 if (avrcp_browsing_connected){ 482 printf(" - AVRCP Browsing Controller disconnect from addr %s.\n", bd_addr_to_str(device_addr)); 483 status = avrcp_browsing_controller_disconnect(browsing_cid); 484 break; 485 } 486 printf("AVRCP Browsing Controller already disconnected\n"); 487 break; 488 case '\n': 489 case '\r': 490 break; 491 492 default: 493 if (!avrcp_browsing_connected){ 494 show_usage(); 495 printf("Please connect the AVRCP Browsing client\n"); 496 break; 497 } 498 499 switch (cmd) { 500 case 'I': 501 if (player_index < 0) { 502 printf("Get media players first\n"); 503 break; 504 } 505 printf("Set addressed player\n"); 506 status = avrcp_controller_set_addressed_player(avrcp_cid, players[0]); 507 break; 508 case 'O': 509 if (player_index < 0) { 510 printf("Get media players first\n"); 511 break; 512 } 513 printf("Set browsed player\n"); 514 status = avrcp_browsing_controller_set_browsed_player(browsing_cid, players[0]); 515 break; 516 case 'p': 517 printf("AVRCP Browsing: get media players\n"); 518 player_index = -1; 519 status = avrcp_browsing_controller_get_media_players(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 520 break; 521 case 'Q': 522 printf("AVRCP Browsing: browse folders\n"); 523 folder_index = -1; 524 status = avrcp_browsing_controller_browse_file_system(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 525 break; 526 case 'P': 527 printf("AVRCP Browsing: browse media items\n"); 528 avrcp_browsing_controller_browse_media(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 529 break; 530 case 'W': 531 printf("AVRCP Browsing: go up one level\n"); 532 status = avrcp_browsing_controller_go_up_one_level(browsing_cid); 533 folder_index = -1; 534 break; 535 case 'T': 536 if (folder_index < 0 && !parent_folder_set){ 537 printf("AVRCP Browsing: no folders available\n"); 538 break; 539 } 540 if (!parent_folder_set){ 541 parent_folder_set = 1; 542 memcpy(parent_folder_name, folders[0].name, folders[0].name_len); 543 memcpy(parent_folder_uid, folders[0].uid, 8); 544 } 545 printf("AVRCP Browsing: go down one level of %s\n", (char *)parent_folder_name); 546 status = avrcp_browsing_controller_go_down_one_level(browsing_cid, parent_folder_uid); 547 folder_index = -1; 548 break; 549 default: 550 show_usage(); 551 break; 552 } 553 break; 554 } 555 556 if (status != ERROR_CODE_SUCCESS){ 557 printf("Could not perform command, status 0x%2x\n", status); 558 } 559 } 560 #endif 561 /* EXAMPLE_END */ 562