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): Performance - Stream Data over GATT (Client) 46 * 47 * @text Connects to 'LE Streamer' and subscribes to test characteristic 48 * 49 */ 50 // ***************************************************************************** 51 52 #include <inttypes.h> 53 #include <stdint.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 58 #include "btstack.h" 59 60 // prototypes 61 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 62 63 typedef enum { 64 TC_OFF, 65 TC_IDLE, 66 TC_W4_SCAN_RESULT, 67 TC_W4_CONNECT, 68 TC_W4_SERVICE_RESULT, 69 TC_W4_CHARACTERISTIC_RX_RESULT, 70 TC_W4_CHARACTERISTIC_TX_RESULT, 71 TC_W4_ENABLE_NOTIFICATIONS_COMPLETE, 72 TC_W4_TEST_DATA 73 } gc_state_t; 74 75 static bd_addr_t cmdline_addr; 76 static int cmdline_addr_found = 0; 77 78 // addr and type of device with correct name 79 static bd_addr_t le_streamer_addr; 80 static bd_addr_type_t le_streamer_addr_type; 81 82 static hci_con_handle_t connection_handle; 83 84 // On the GATT Server, RX Characteristic is used for receive data via Write, and TX Characteristic is used to send data via Notifications 85 static uint8_t le_streamer_service_uuid[16] = { 0x00, 0x00, 0xFF, 0x10, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 86 static uint8_t le_streamer_characteristic_rx_uuid[16] = { 0x00, 0x00, 0xFF, 0x11, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 87 static uint8_t le_streamer_characteristic_tx_uuid[16] = { 0x00, 0x00, 0xFF, 0x12, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB}; 88 89 static gatt_client_service_t le_streamer_service; 90 static gatt_client_characteristic_t le_streamer_characteristic_rx; 91 static gatt_client_characteristic_t le_streamer_characteristic_tx; 92 93 static gatt_client_notification_t notification_listener; 94 static int listener_registered; 95 96 static gc_state_t state = TC_OFF; 97 static btstack_packet_callback_registration_t hci_event_callback_registration; 98 99 /* 100 * @section Track throughput 101 * @text We calculate the throughput by setting a start time and measuring the amount of 102 * data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s 103 * and reset the counter and start time. 104 */ 105 106 /* LISTING_START(tracking): Tracking throughput */ 107 108 #define TEST_MODE_WRITE_WITHOUT_RESPONSE 1 109 #define TEST_MODE_ENABLE_NOTIFICATIONS 2 110 #define TEST_MODE_DUPLEX 3 111 112 // configure test mode: send only, receive only, full duplex 113 #define TEST_MODE TEST_MODE_DUPLEX 114 115 #define REPORT_INTERVAL_MS 3000 116 117 // support for multiple clients 118 typedef struct { 119 char name; 120 int le_notification_enabled; 121 int counter; 122 char test_data[200]; 123 int test_data_len; 124 uint32_t test_data_sent; 125 uint32_t test_data_start; 126 } le_streamer_connection_t; 127 128 static le_streamer_connection_t le_streamer_connection; 129 130 static void test_reset(le_streamer_connection_t * context){ 131 context->test_data_start = btstack_run_loop_get_time_ms(); 132 context->test_data_sent = 0; 133 } 134 135 static void test_track_data(le_streamer_connection_t * context, int bytes_sent){ 136 context->test_data_sent += bytes_sent; 137 // evaluate 138 uint32_t now = btstack_run_loop_get_time_ms(); 139 uint32_t time_passed = now - context->test_data_start; 140 if (time_passed < REPORT_INTERVAL_MS) return; 141 // print speed 142 int bytes_per_second = context->test_data_sent * 1000 / time_passed; 143 printf("%c: %"PRIu32" bytes -> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000); 144 145 // restart 146 context->test_data_start = now; 147 context->test_data_sent = 0; 148 } 149 /* LISTING_END(tracking): Tracking throughput */ 150 151 152 // stramer 153 static void streamer(le_streamer_connection_t * context){ 154 if (connection_handle == HCI_CON_HANDLE_INVALID) return; 155 156 // create test data 157 context->counter++; 158 if (context->counter > 'Z') context->counter = 'A'; 159 memset(context->test_data, context->counter, context->test_data_len); 160 161 // send 162 uint8_t status = gatt_client_write_value_of_characteristic_without_response(connection_handle, le_streamer_characteristic_rx.value_handle, context->test_data_len, (uint8_t*) context->test_data); 163 if (status){ 164 printf("error %02x for write without response!\n", status); 165 return; 166 } else { 167 test_track_data(&le_streamer_connection, context->test_data_len); 168 } 169 170 // request again 171 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 172 } 173 174 175 // returns 1 if name is found in advertisement 176 static int advertisement_report_contains_name(const char * name, uint8_t * advertisement_report){ 177 // get advertisement from report event 178 const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report); 179 uint16_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report); 180 int name_len = strlen(name); 181 182 // iterate over advertisement data 183 ad_context_t context; 184 for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 185 uint8_t data_type = ad_iterator_get_data_type(&context); 186 uint8_t data_size = ad_iterator_get_data_len(&context); 187 const uint8_t * data = ad_iterator_get_data(&context); 188 int i; 189 switch (data_type){ 190 case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME: 191 case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME: 192 // compare common prefix 193 for (i=0; i<data_size && i<name_len;i++){ 194 if (data[i] != name[i]) break; 195 } 196 // prefix match 197 return 1; 198 default: 199 break; 200 } 201 } 202 return 0; 203 } 204 205 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 206 UNUSED(packet_type); 207 UNUSED(channel); 208 UNUSED(size); 209 210 uint16_t mtu; 211 switch(state){ 212 case TC_W4_SERVICE_RESULT: 213 switch(hci_event_packet_get_type(packet)){ 214 case GATT_EVENT_SERVICE_QUERY_RESULT: 215 // store service (we expect only one) 216 gatt_event_service_query_result_get_service(packet, &le_streamer_service); 217 break; 218 case GATT_EVENT_QUERY_COMPLETE: 219 if (packet[4] != 0){ 220 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 221 gap_disconnect(connection_handle); 222 break; 223 } 224 // service query complete, look for characteristic 225 state = TC_W4_CHARACTERISTIC_RX_RESULT; 226 printf("Search for LE Streamer RX characteristic.\n"); 227 gatt_client_discover_characteristics_for_service_by_uuid128(handle_gatt_client_event, connection_handle, &le_streamer_service, le_streamer_characteristic_rx_uuid); 228 break; 229 default: 230 break; 231 } 232 break; 233 234 case TC_W4_CHARACTERISTIC_RX_RESULT: 235 switch(hci_event_packet_get_type(packet)){ 236 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 237 gatt_event_characteristic_query_result_get_characteristic(packet, &le_streamer_characteristic_rx); 238 break; 239 case GATT_EVENT_QUERY_COMPLETE: 240 if (packet[4] != 0){ 241 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 242 gap_disconnect(connection_handle); 243 break; 244 } 245 // rx characteristiic found, look for tx characteristic 246 state = TC_W4_CHARACTERISTIC_TX_RESULT; 247 printf("Search for LE Streamer TX characteristic.\n"); 248 gatt_client_discover_characteristics_for_service_by_uuid128(handle_gatt_client_event, connection_handle, &le_streamer_service, le_streamer_characteristic_tx_uuid); 249 break; 250 default: 251 break; 252 } 253 break; 254 255 case TC_W4_CHARACTERISTIC_TX_RESULT: 256 switch(hci_event_packet_get_type(packet)){ 257 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 258 gatt_event_characteristic_query_result_get_characteristic(packet, &le_streamer_characteristic_tx); 259 break; 260 case GATT_EVENT_QUERY_COMPLETE: 261 if (packet[4] != 0){ 262 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 263 gap_disconnect(connection_handle); 264 break; 265 } 266 // register handler for notifications 267 listener_registered = 1; 268 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &le_streamer_characteristic_tx); 269 // setup tracking 270 le_streamer_connection.name = 'A'; 271 le_streamer_connection.test_data_len = ATT_DEFAULT_MTU - 3; 272 test_reset(&le_streamer_connection); 273 gatt_client_get_mtu(connection_handle, &mtu); 274 le_streamer_connection.test_data_len = btstack_min(mtu - 3, sizeof(le_streamer_connection.test_data)); 275 printf("%c: ATT MTU = %u => use test data of len %u\n", le_streamer_connection.name, mtu, le_streamer_connection.test_data_len); 276 // enable notifications 277 #if (TEST_MODE & TEST_MODE_ENABLE_NOTIFICATIONS) 278 printf("Start streaming - enable notify on test characteristic.\n"); 279 state = TC_W4_ENABLE_NOTIFICATIONS_COMPLETE; 280 gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, 281 &le_streamer_characteristic_tx, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 282 break; 283 #endif 284 state = TC_W4_TEST_DATA; 285 #if (TEST_MODE & TEST_MODE_WRITE_WITHOUT_RESPONSE) 286 printf("Start streaming - request can send now.\n"); 287 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 288 #endif 289 break; 290 default: 291 break; 292 } 293 break; 294 295 case TC_W4_ENABLE_NOTIFICATIONS_COMPLETE: 296 switch(hci_event_packet_get_type(packet)){ 297 case GATT_EVENT_QUERY_COMPLETE: 298 printf("Notifications enabled, ATT status %02x\n", gatt_event_query_complete_get_att_status(packet)); 299 if (gatt_event_query_complete_get_att_status(packet) != ATT_ERROR_SUCCESS) break; 300 state = TC_W4_TEST_DATA; 301 #if (TEST_MODE & TEST_MODE_WRITE_WITHOUT_RESPONSE) 302 printf("Start streaming - request can send now.\n"); 303 gatt_client_request_can_write_without_response_event(handle_gatt_client_event, connection_handle); 304 #endif 305 break; 306 default: 307 break; 308 } 309 break; 310 311 case TC_W4_TEST_DATA: 312 switch(hci_event_packet_get_type(packet)){ 313 case GATT_EVENT_NOTIFICATION: 314 test_track_data(&le_streamer_connection, gatt_event_notification_get_value_length(packet)); 315 break; 316 case GATT_EVENT_QUERY_COMPLETE: 317 break; 318 case GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE: 319 streamer(&le_streamer_connection); 320 break; 321 default: 322 printf("Unknown packet type %x\n", hci_event_packet_get_type(packet)); 323 break; 324 } 325 break; 326 327 default: 328 printf("error\n"); 329 break; 330 } 331 332 } 333 334 // Either connect to remote specified on command line or start scan for device with "LE Streamer" in advertisement 335 static void le_streamer_client_start(void){ 336 if (cmdline_addr_found){ 337 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 338 state = TC_W4_CONNECT; 339 gap_connect(cmdline_addr, 0); 340 } else { 341 printf("Start scanning!\n"); 342 state = TC_W4_SCAN_RESULT; 343 gap_set_scan_parameters(0,0x0030, 0x0030); 344 gap_start_scan(); 345 } 346 } 347 348 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 349 UNUSED(channel); 350 UNUSED(size); 351 352 if (packet_type != HCI_EVENT_PACKET) return; 353 354 uint16_t conn_interval; 355 uint8_t event = hci_event_packet_get_type(packet); 356 switch (event) { 357 case BTSTACK_EVENT_STATE: 358 // BTstack activated, get started 359 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { 360 le_streamer_client_start(); 361 } else { 362 state = TC_OFF; 363 } 364 break; 365 case GAP_EVENT_ADVERTISING_REPORT: 366 if (state != TC_W4_SCAN_RESULT) return; 367 // check name in advertisement 368 if (!advertisement_report_contains_name("LE Streamer", packet)) return; 369 // store address and type 370 gap_event_advertising_report_get_address(packet, le_streamer_addr); 371 le_streamer_addr_type = gap_event_advertising_report_get_address_type(packet); 372 // stop scanning, and connect to the device 373 state = TC_W4_CONNECT; 374 gap_stop_scan(); 375 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_streamer_addr)); 376 gap_connect(le_streamer_addr,le_streamer_addr_type); 377 break; 378 case HCI_EVENT_LE_META: 379 // wait for connection complete 380 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 381 if (state != TC_W4_CONNECT) return; 382 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 383 // print connection parameters (without using float operations) 384 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 385 printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); 386 printf("Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); 387 // initialize gatt client context with handle, and add it to the list of active clients 388 // query primary services 389 printf("Search for LE Streamer service.\n"); 390 state = TC_W4_SERVICE_RESULT; 391 gatt_client_discover_primary_services_by_uuid128(handle_gatt_client_event, connection_handle, le_streamer_service_uuid); 392 break; 393 case HCI_EVENT_DISCONNECTION_COMPLETE: 394 // unregister listener 395 connection_handle = HCI_CON_HANDLE_INVALID; 396 if (listener_registered){ 397 listener_registered = 0; 398 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 399 } 400 if (cmdline_addr_found){ 401 printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr)); 402 return; 403 } 404 printf("Disconnected %s\n", bd_addr_to_str(le_streamer_addr)); 405 if (state == TC_OFF) break; 406 le_streamer_client_start(); 407 break; 408 default: 409 break; 410 } 411 } 412 413 #ifdef HAVE_BTSTACK_STDIN 414 static void usage(const char *name){ 415 fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 416 fprintf(stderr, "If no argument is provided, LE Streamer Client will start scanning and connect to the first device named 'LE Streamer'.\n"); 417 fprintf(stderr, "To connect to a specific device use argument [-a].\n\n"); 418 } 419 #endif 420 421 int btstack_main(int argc, const char * argv[]); 422 int btstack_main(int argc, const char * argv[]){ 423 424 #ifdef HAVE_BTSTACK_STDIN 425 int arg = 1; 426 cmdline_addr_found = 0; 427 428 while (arg < argc) { 429 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 430 arg++; 431 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 432 arg++; 433 if (!cmdline_addr_found) exit(1); 434 continue; 435 } 436 usage(argv[0]); 437 return 0; 438 } 439 #else 440 (void)argc; 441 (void)argv; 442 #endif 443 l2cap_init(); 444 445 sm_init(); 446 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 447 448 // sm_init needed before gatt_client_init 449 gatt_client_init(); 450 451 hci_event_callback_registration.callback = &hci_event_handler; 452 hci_add_event_handler(&hci_event_callback_registration); 453 454 // use different connection parameters: conn interval min/max (* 1.25 ms), slave latency, supervision timeout, CE len min/max (* 0.6125 ms) 455 // gap_set_connection_parameters(0x06, 0x06, 4, 1000, 0x01, 0x06 * 2); 456 457 // turn on! 458 hci_power_control(HCI_POWER_ON); 459 460 return 0; 461 } 462 /* EXAMPLE_END */ 463