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