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 * le_streamer_client.c 42 */ 43 44 // ***************************************************************************** 45 /* EXAMPLE_START(le_streamer_client): Connects to 'LE Streamer' and subscribes to test characteristic 46 */ 47 // ***************************************************************************** 48 49 #include <inttypes.h> 50 #include <stdint.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include "btstack.h" 56 57 // prototypes 58 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 59 60 typedef enum { 61 TC_OFF, 62 TC_IDLE, 63 TC_W4_SCAN_RESULT, 64 TC_W4_CONNECT, 65 TC_W4_SERVICE_RESULT, 66 TC_W4_CHARACTERISTIC_RESULT, 67 TC_W4_ENABLE_NOTIFICATIONS_COMPLETE, 68 TC_W4_TEST_DATA 69 } gc_state_t; 70 71 static bd_addr_t cmdline_addr = { }; 72 static int cmdline_addr_found = 0; 73 74 // addr and type of device with correct name 75 static bd_addr_t le_streamer_addr; 76 static bd_addr_type_t le_streamer_addr_type; 77 78 static hci_con_handle_t connection_handle; 79 static uint8_t le_streamer_service_uuid[16] = { 0x00, 0x00, 0xFF, 0x10, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 80 static uint8_t le_streamer_characteristic_uuid[16] = { 0x00, 0x00, 0xFF, 0x11, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 81 82 static gatt_client_service_t le_streamer_service; 83 static gatt_client_characteristic_t le_streamer_characteristic; 84 85 static gatt_client_notification_t notification_listener; 86 static int listener_registered; 87 88 static gc_state_t state = TC_OFF; 89 static btstack_packet_callback_registration_t hci_event_callback_registration; 90 91 /* 92 * @section Track throughput 93 * @text We calculate the throughput by setting a start time and measuring the amount of 94 * data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s 95 * and reset the counter and start time. 96 */ 97 98 /* LISTING_START(tracking): Tracking throughput */ 99 100 #define TEST_MODE_WRITE_WITHOUT_RESPONSE 1 101 #define TEST_MODE_ENABLE_NOTIFICATIONS 2 102 #define TEST_MODE_DUPLEX 3 103 104 // configure test mode: send only, receive only, full duplex 105 #define TEST_MODE TEST_MODE_DUPLEX 106 107 #define REPORT_INTERVAL_MS 3000 108 109 // support for multiple clients 110 typedef struct { 111 char name; 112 int le_notification_enabled; 113 // hci_con_handle_t connection_handle; 114 int counter; 115 char test_data[200]; 116 int test_data_len; 117 uint32_t test_data_sent; 118 uint32_t test_data_start; 119 } le_streamer_connection_t; 120 121 static le_streamer_connection_t le_streamer_connection; 122 123 static void test_reset(le_streamer_connection_t * context){ 124 context->test_data_start = btstack_run_loop_get_time_ms(); 125 context->test_data_sent = 0; 126 } 127 128 static void test_track_data(le_streamer_connection_t * context, int bytes_sent){ 129 context->test_data_sent += bytes_sent; 130 // evaluate 131 uint32_t now = btstack_run_loop_get_time_ms(); 132 uint32_t time_passed = now - context->test_data_start; 133 if (time_passed < REPORT_INTERVAL_MS) return; 134 // print speed 135 int bytes_per_second = context->test_data_sent * 1000 / time_passed; 136 printf("%c: %"PRIu32" bytes -> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000); 137 138 // restart 139 context->test_data_start = now; 140 context->test_data_sent = 0; 141 } 142 /* LISTING_END(tracking): Tracking throughput */ 143 144 145 // stramer 146 static void streamer(le_streamer_connection_t * context){ 147 if (connection_handle == HCI_CON_HANDLE_INVALID) return; 148 149 // create test data 150 context->counter++; 151 if (context->counter > 'Z') context->counter = 'A'; 152 memset(context->test_data, context->counter, context->test_data_len); 153 154 // send 155 uint8_t status = gatt_client_write_value_of_characteristic_without_response(connection_handle, le_streamer_characteristic.value_handle, context->test_data_len, (uint8_t*) context->test_data); 156 if (status){ 157 printf("error %02x for write without response!\n", status); 158 return; 159 } else { 160 test_track_data(&le_streamer_connection, context->test_data_len); 161 } 162 163 // request again 164 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 165 } 166 167 168 // returns 1 if name is found in advertisement 169 static int advertisement_report_contains_name(const char * name, uint8_t * advertisement_report){ 170 // get advertisement from report event 171 const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report); 172 uint16_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report); 173 int name_len = strlen(name); 174 175 // iterate over advertisement data 176 ad_context_t context; 177 for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 178 uint8_t data_type = ad_iterator_get_data_type(&context); 179 uint8_t data_size = ad_iterator_get_data_len(&context); 180 const uint8_t * data = ad_iterator_get_data(&context); 181 int i; 182 switch (data_type){ 183 case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME: 184 case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME: 185 // compare common prefix 186 for (i=0; i<data_size && i<name_len;i++){ 187 if (data[i] != name[i]) break; 188 } 189 // prefix match 190 return 1; 191 default: 192 break; 193 } 194 } 195 return 0; 196 } 197 198 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 199 UNUSED(packet_type); 200 UNUSED(channel); 201 UNUSED(size); 202 203 uint16_t mtu; 204 switch(state){ 205 case TC_W4_SERVICE_RESULT: 206 switch(hci_event_packet_get_type(packet)){ 207 case GATT_EVENT_SERVICE_QUERY_RESULT: 208 // store service (we expect only one) 209 gatt_event_service_query_result_get_service(packet, &le_streamer_service); 210 break; 211 case GATT_EVENT_QUERY_COMPLETE: 212 if (packet[4] != 0){ 213 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 214 gap_disconnect(connection_handle); 215 break; 216 } 217 // service query complete, look for characteristic 218 state = TC_W4_CHARACTERISTIC_RESULT; 219 printf("Search for LE Streamer test characteristic.\n"); 220 gatt_client_discover_characteristics_for_service_by_uuid128(handle_gatt_client_event, connection_handle, &le_streamer_service, le_streamer_characteristic_uuid); 221 break; 222 default: 223 break; 224 } 225 break; 226 227 case TC_W4_CHARACTERISTIC_RESULT: 228 switch(hci_event_packet_get_type(packet)){ 229 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 230 gatt_event_characteristic_query_result_get_characteristic(packet, &le_streamer_characteristic); 231 break; 232 case GATT_EVENT_QUERY_COMPLETE: 233 if (packet[4] != 0){ 234 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 235 gap_disconnect(connection_handle); 236 break; 237 } 238 // register handler for notifications 239 listener_registered = 1; 240 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &le_streamer_characteristic); 241 // setup tracking 242 le_streamer_connection.name = 'A'; 243 le_streamer_connection.test_data_len = ATT_DEFAULT_MTU - 3; 244 test_reset(&le_streamer_connection); 245 gatt_client_get_mtu(connection_handle, &mtu); 246 le_streamer_connection.test_data_len = btstack_min(mtu - 3, sizeof(le_streamer_connection.test_data)); 247 printf("%c: ATT MTU = %u => use test data of len %u\n", le_streamer_connection.name, mtu, le_streamer_connection.test_data_len); 248 // enable notifications 249 #if (TEST_MODE & TEST_MODE_ENABLE_NOTIFICATIONS) 250 printf("Start streaming - enable notify on test characteristic.\n"); 251 state = TC_W4_ENABLE_NOTIFICATIONS_COMPLETE; 252 gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, 253 &le_streamer_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 254 break; 255 #endif 256 state = TC_W4_TEST_DATA; 257 #if (TEST_MODE & TEST_MODE_WRITE_WITHOUT_RESPONSE) 258 printf("Start streaming - request can send now.\n"); 259 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 260 #endif 261 break; 262 default: 263 break; 264 } 265 break; 266 267 case TC_W4_ENABLE_NOTIFICATIONS_COMPLETE: 268 switch(hci_event_packet_get_type(packet)){ 269 case GATT_EVENT_QUERY_COMPLETE: 270 printf("Notifications enabled, status %02x\n", gatt_event_query_complete_get_status(packet)); 271 state = TC_W4_TEST_DATA; 272 #if (TEST_MODE & TEST_MODE_WRITE_WITHOUT_RESPONSE) 273 printf("Start streaming - request can send now.\n"); 274 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 275 #endif 276 break; 277 default: 278 break; 279 } 280 break; 281 282 case TC_W4_TEST_DATA: 283 switch(hci_event_packet_get_type(packet)){ 284 case GATT_EVENT_NOTIFICATION: 285 #if 0 286 printf("Data: "); 287 printf_hexdump( gatt_event_notification_get_value(packet), gatt_event_notification_get_value_length(packet)); 288 #else 289 test_track_data(&le_streamer_connection, gatt_event_notification_get_value_length(packet)); 290 #endif 291 break; 292 case GATT_EVENT_QUERY_COMPLETE: 293 break; 294 case GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE: 295 streamer(&le_streamer_connection); 296 break; 297 default: 298 printf("Unknown packet type %x\n", hci_event_packet_get_type(packet)); 299 break; 300 } 301 break; 302 303 default: 304 printf("error\n"); 305 break; 306 } 307 308 } 309 310 // Either connect to remote specified on command line or start scan for device with "LE Streamer" in advertisement 311 static void le_streamer_client_start(void){ 312 if (cmdline_addr_found){ 313 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 314 state = TC_W4_CONNECT; 315 gap_connect(cmdline_addr, 0); 316 } else { 317 printf("Start scanning!\n"); 318 state = TC_W4_SCAN_RESULT; 319 gap_set_scan_parameters(0,0x0030, 0x0030); 320 gap_start_scan(); 321 } 322 } 323 324 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 325 UNUSED(channel); 326 UNUSED(size); 327 328 if (packet_type != HCI_EVENT_PACKET) return; 329 330 uint16_t conn_interval; 331 uint8_t event = hci_event_packet_get_type(packet); 332 switch (event) { 333 case BTSTACK_EVENT_STATE: 334 // BTstack activated, get started 335 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { 336 le_streamer_client_start(); 337 } else { 338 state = TC_OFF; 339 } 340 break; 341 case GAP_EVENT_ADVERTISING_REPORT: 342 if (state != TC_W4_SCAN_RESULT) return; 343 // check name in advertisement 344 if (!advertisement_report_contains_name("LE Streamer", packet)) return; 345 // store address and type 346 gap_event_advertising_report_get_address(packet, le_streamer_addr); 347 le_streamer_addr_type = gap_event_advertising_report_get_address_type(packet); 348 // stop scanning, and connect to the device 349 state = TC_W4_CONNECT; 350 gap_stop_scan(); 351 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_streamer_addr)); 352 gap_connect(le_streamer_addr,le_streamer_addr_type); 353 break; 354 case HCI_EVENT_LE_META: 355 // wait for connection complete 356 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 357 if (state != TC_W4_CONNECT) return; 358 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 359 // print connection parameters (without using float operations) 360 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 361 printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); 362 printf("Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); 363 // initialize gatt client context with handle, and add it to the list of active clients 364 // query primary services 365 printf("Search for LE Streamer service.\n"); 366 state = TC_W4_SERVICE_RESULT; 367 gatt_client_discover_primary_services_by_uuid128(handle_gatt_client_event, connection_handle, le_streamer_service_uuid); 368 break; 369 case HCI_EVENT_DISCONNECTION_COMPLETE: 370 // unregister listener 371 connection_handle = HCI_CON_HANDLE_INVALID; 372 if (listener_registered){ 373 listener_registered = 0; 374 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 375 } 376 if (cmdline_addr_found){ 377 printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr)); 378 return; 379 } 380 printf("Disconnected %s\n", bd_addr_to_str(le_streamer_addr)); 381 if (state == TC_OFF) break; 382 le_streamer_client_start(); 383 break; 384 default: 385 break; 386 } 387 } 388 389 #ifdef HAVE_BTSTACK_STDIN 390 static void usage(const char *name){ 391 fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 392 fprintf(stderr, "If no argument is provided, LE Streamer Client will start scanning and connect to the first device named 'LE Streamer'.\n"); 393 fprintf(stderr, "To connect to a specific device use argument [-a].\n\n"); 394 } 395 #endif 396 397 int btstack_main(int argc, const char * argv[]); 398 int btstack_main(int argc, const char * argv[]){ 399 400 #ifdef HAVE_BTSTACK_STDIN 401 int arg = 1; 402 cmdline_addr_found = 0; 403 404 while (arg < argc) { 405 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 406 arg++; 407 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 408 arg++; 409 if (!cmdline_addr_found) exit(1); 410 continue; 411 } 412 usage(argv[0]); 413 return 0; 414 } 415 #else 416 (void)argc; 417 (void)argv; 418 #endif 419 420 hci_event_callback_registration.callback = &hci_event_handler; 421 hci_add_event_handler(&hci_event_callback_registration); 422 423 l2cap_init(); 424 425 gatt_client_init(); 426 427 sm_init(); 428 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 429 430 // use different connection parameters: conn interval min/max (* 1.25 ms), slave latency, supervision timeout, CE len min/max (* 0.6125 ms) 431 // gap_set_connection_parameters(0x06, 0x06, 4, 1000, 0x01, 0x06 * 2); 432 433 // turn on! 434 hci_power_control(HCI_POWER_ON); 435 436 return 0; 437 } 438 /* EXAMPLE_END */ 439