1 /* 2 * Copyright (C) 2018 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__ "gatt_heart_rate_client.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(gatt_heart_rate_client): Connects for Heart Rate Sensor and reports measurements */ 42 // ***************************************************************************** 43 44 #include <inttypes.h> 45 #include <stdint.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include "btstack.h" 51 52 // prototypes 53 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 54 55 typedef enum { 56 TC_OFF, 57 TC_IDLE, 58 TC_W4_SCAN_RESULT, 59 TC_W4_CONNECT, 60 TC_W4_SERVICE_RESULT, 61 TC_W4_HEART_RATE_MEASUREMENT_CHARACTERISTIC, 62 TC_W4_ENABLE_NOTIFICATIONS_COMPLETE, 63 TC_W4_SENSOR_LOCATION_CHARACTERISTIC, 64 TC_W4_SENSOR_LOCATION, 65 TC_CONNECTED 66 } gc_state_t; 67 68 static const char * sensor_contact_string[] = { 69 "not supported", 70 "not supported", 71 "no/poor contact", 72 "good contact" 73 }; 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 static gatt_client_service_t heart_rate_service; 85 static gatt_client_characteristic_t body_sensor_location_characteristic; 86 static gatt_client_characteristic_t heart_rate_measurement_characteristic; 87 88 static uint8_t body_sensor_location; 89 90 static gatt_client_notification_t notification_listener; 91 static int listener_registered; 92 93 static gc_state_t state = TC_OFF; 94 static btstack_packet_callback_registration_t hci_event_callback_registration; 95 96 97 // returns 1 if name is found in advertisement 98 static int advertisement_report_contains_uuid16(uint16_t uuid16, uint8_t * advertisement_report){ 99 // get advertisement from report event 100 const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report); 101 uint16_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report); 102 103 // iterate over advertisement data 104 ad_context_t context; 105 int found = 0; 106 for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 107 uint8_t data_type = ad_iterator_get_data_type(&context); 108 uint8_t data_size = ad_iterator_get_data_len(&context); 109 const uint8_t * data = ad_iterator_get_data(&context); 110 int i; 111 switch (data_type){ 112 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 113 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 114 // compare common prefix 115 for (i=0; i<data_size;i+=2){ 116 if (little_endian_read_16(data, i) == uuid16) { 117 found = 1; 118 break; 119 } 120 } 121 break; 122 default: 123 break; 124 } 125 } 126 return found; 127 } 128 129 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 130 UNUSED(packet_type); 131 UNUSED(channel); 132 UNUSED(size); 133 134 uint16_t heart_rate; 135 uint8_t sensor_contact; 136 137 switch(state){ 138 case TC_W4_SERVICE_RESULT: 139 switch(hci_event_packet_get_type(packet)){ 140 case GATT_EVENT_SERVICE_QUERY_RESULT: 141 // store service (we expect only one) 142 gatt_event_service_query_result_get_service(packet, &heart_rate_service); 143 break; 144 case GATT_EVENT_QUERY_COMPLETE: 145 if (packet[4] != 0){ 146 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 147 gap_disconnect(connection_handle); 148 break; 149 } 150 state = TC_W4_HEART_RATE_MEASUREMENT_CHARACTERISTIC; 151 printf("Search for Heart Rate Measurement characteristic.\n"); 152 gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &heart_rate_service, ORG_BLUETOOTH_CHARACTERISTIC_HEART_RATE_MEASUREMENT); 153 break; 154 default: 155 break; 156 } 157 break; 158 159 case TC_W4_HEART_RATE_MEASUREMENT_CHARACTERISTIC: 160 switch(hci_event_packet_get_type(packet)){ 161 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 162 gatt_event_characteristic_query_result_get_characteristic(packet, &heart_rate_measurement_characteristic); 163 break; 164 case GATT_EVENT_QUERY_COMPLETE: 165 if (packet[4] != 0){ 166 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 167 gap_disconnect(connection_handle); 168 break; 169 } 170 // register handler for notifications 171 listener_registered = 1; 172 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &heart_rate_measurement_characteristic); 173 // enable notifications 174 printf("Enable Notify on Heart Rate Measurements characteristic.\n"); 175 state = TC_W4_ENABLE_NOTIFICATIONS_COMPLETE; 176 gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, 177 &heart_rate_measurement_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 178 break; 179 default: 180 break; 181 } 182 break; 183 184 case TC_W4_ENABLE_NOTIFICATIONS_COMPLETE: 185 switch(hci_event_packet_get_type(packet)){ 186 case GATT_EVENT_QUERY_COMPLETE: 187 printf("Notifications enabled, ATT status %02x\n", gatt_event_query_complete_get_att_status(packet)); 188 189 state = TC_W4_SENSOR_LOCATION_CHARACTERISTIC; 190 printf("Search for Sensor Location characteristic.\n"); 191 gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &heart_rate_service, ORG_BLUETOOTH_CHARACTERISTIC_BODY_SENSOR_LOCATION); 192 break; 193 default: 194 break; 195 } 196 break; 197 198 199 case TC_W4_SENSOR_LOCATION_CHARACTERISTIC: 200 switch(hci_event_packet_get_type(packet)){ 201 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 202 gatt_event_characteristic_query_result_get_characteristic(packet, &body_sensor_location_characteristic); 203 break; 204 case GATT_EVENT_QUERY_COMPLETE: 205 if (packet[4] != 0){ 206 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 207 state = TC_CONNECTED; 208 break; 209 } 210 state = TC_W4_HEART_RATE_MEASUREMENT_CHARACTERISTIC; 211 printf("Read Body Sensor Location.\n"); 212 state = TC_W4_SENSOR_LOCATION; 213 gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &body_sensor_location_characteristic); 214 break; 215 default: 216 break; 217 } 218 break; 219 220 221 case TC_W4_SENSOR_LOCATION: 222 switch(hci_event_packet_get_type(packet)){ 223 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 224 body_sensor_location = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 225 printf("Sensor Location: %u\n", body_sensor_location); 226 state = TC_CONNECTED; 227 break; 228 default: 229 break; 230 } 231 break; 232 233 case TC_CONNECTED: 234 switch(hci_event_packet_get_type(packet)){ 235 case GATT_EVENT_NOTIFICATION: 236 if (gatt_event_notification_get_value(packet)[0] & 1){ 237 heart_rate = little_endian_read_16(gatt_event_notification_get_value(packet), 1); 238 } else { 239 heart_rate = gatt_event_notification_get_value(packet)[1]; 240 } 241 sensor_contact = (gatt_event_notification_get_value(packet)[0] >> 1) & 3; 242 printf("Heart Rate: %3u, Sensor Contact: %s\n", heart_rate, sensor_contact_string[sensor_contact]); 243 break; 244 case GATT_EVENT_QUERY_COMPLETE: 245 break; 246 case GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE: 247 break; 248 default: 249 break; 250 } 251 break; 252 253 default: 254 break; 255 } 256 } 257 258 // Either connect to remote specified on command line or start scan for device with Hear Rate Service in advertisement 259 static void gatt_heart_rate_client_start(void){ 260 if (cmdline_addr_found){ 261 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 262 state = TC_W4_CONNECT; 263 gap_connect(cmdline_addr, 0); 264 } else { 265 printf("Start scanning!\n"); 266 state = TC_W4_SCAN_RESULT; 267 gap_set_scan_parameters(0,0x0030, 0x0030); 268 gap_start_scan(); 269 } 270 } 271 272 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 273 UNUSED(channel); 274 UNUSED(size); 275 276 if (packet_type != HCI_EVENT_PACKET) return; 277 278 uint16_t conn_interval; 279 uint8_t event = hci_event_packet_get_type(packet); 280 switch (event) { 281 case BTSTACK_EVENT_STATE: 282 // BTstack activated, get started 283 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { 284 gatt_heart_rate_client_start(); 285 } else { 286 state = TC_OFF; 287 } 288 break; 289 case GAP_EVENT_ADVERTISING_REPORT: 290 if (state != TC_W4_SCAN_RESULT) return; 291 // check name in advertisement 292 if (!advertisement_report_contains_uuid16(ORG_BLUETOOTH_SERVICE_HEART_RATE, packet)) return; 293 // store address and type 294 gap_event_advertising_report_get_address(packet, le_streamer_addr); 295 le_streamer_addr_type = gap_event_advertising_report_get_address_type(packet); 296 // stop scanning, and connect to the device 297 state = TC_W4_CONNECT; 298 gap_stop_scan(); 299 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_streamer_addr)); 300 gap_connect(le_streamer_addr,le_streamer_addr_type); 301 break; 302 case HCI_EVENT_LE_META: 303 // wait for connection complete 304 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 305 if (state != TC_W4_CONNECT) return; 306 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 307 // print connection parameters (without using float operations) 308 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 309 printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); 310 printf("Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); 311 // initialize gatt client context with handle, and add it to the list of active clients 312 // query primary services 313 printf("Search for Heart Rate service.\n"); 314 state = TC_W4_SERVICE_RESULT; 315 gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, ORG_BLUETOOTH_SERVICE_HEART_RATE); 316 break; 317 case HCI_EVENT_DISCONNECTION_COMPLETE: 318 // unregister listener 319 connection_handle = HCI_CON_HANDLE_INVALID; 320 if (listener_registered){ 321 listener_registered = 0; 322 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 323 } 324 if (cmdline_addr_found){ 325 printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr)); 326 return; 327 } 328 printf("Disconnected %s\n", bd_addr_to_str(le_streamer_addr)); 329 if (state == TC_OFF) break; 330 gatt_heart_rate_client_start(); 331 break; 332 default: 333 break; 334 } 335 } 336 337 #ifdef HAVE_BTSTACK_STDIN 338 static void usage(const char *name){ 339 fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 340 fprintf(stderr, "If no argument is provided, GATT Heart Rate Client will start scanning and connect to the first device named 'LE Streamer'.\n"); 341 fprintf(stderr, "To connect to a specific device use argument [-a].\n\n"); 342 } 343 #endif 344 345 int btstack_main(int argc, const char * argv[]); 346 int btstack_main(int argc, const char * argv[]){ 347 348 #ifdef HAVE_BTSTACK_STDIN 349 int arg = 1; 350 cmdline_addr_found = 0; 351 352 while (arg < argc) { 353 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 354 arg++; 355 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 356 arg++; 357 if (!cmdline_addr_found) exit(1); 358 continue; 359 } 360 usage(argv[0]); 361 return 0; 362 } 363 #else 364 (void)argc; 365 (void)argv; 366 #endif 367 l2cap_init(); 368 369 gatt_client_init(); 370 371 sm_init(); 372 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 373 374 hci_event_callback_registration.callback = &hci_event_handler; 375 hci_add_event_handler(&hci_event_callback_registration); 376 377 // turn on! 378 hci_power_control(HCI_POWER_ON); 379 380 return 0; 381 } 382 /* EXAMPLE_END */ 383