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__ "gatt_battery_query.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(gatt_battery_query): GATT Battery Client 42 * 43 */ 44 45 #include <stdint.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include "btstack.h" 51 52 // gatt_battery_query.gatt contains the declaration of the provided GATT Services + Characteristics 53 // gatt_battery_query.h contains the binary representation of gatt_battery_query.gatt 54 // it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py gatt_battery_query.gatt gatt_battery_query.h 55 // it needs to be regenerated when the GATT Database declared in gatt_battery_query.gatt file is modified 56 #include "gatt_battery_query.h" 57 58 typedef struct advertising_report { 59 uint8_t type; 60 uint8_t event_type; 61 uint8_t address_type; 62 bd_addr_t address; 63 uint8_t rssi; 64 uint8_t length; 65 const uint8_t * data; 66 } advertising_report_t; 67 68 69 typedef enum { 70 TC_IDLE, 71 TC_W4_SCAN_RESULT, 72 TC_W4_CONNECT, 73 TC_W4_SERVICE_RESULT, 74 TC_W4_CHARACTERISTIC_RESULT, 75 TC_W4_BATTERY_DATA 76 } gc_state_t; 77 78 static int blacklist_index = 0; 79 static bd_addr_t blacklist[20]; 80 static advertising_report_t report; 81 82 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 83 84 static bd_addr_t cmdline_addr; 85 static int cmdline_addr_found = 0; 86 87 static hci_con_handle_t connection_handle; 88 static uint16_t battery_service_uuid = 0x180F; 89 static uint16_t battery_level_characteristic_uuid = 0x2a19; 90 static gatt_client_service_t battery_service; 91 static gatt_client_characteristic_t battery_level_characteristic; 92 93 static gc_state_t state = TC_IDLE; 94 static btstack_packet_callback_registration_t hci_event_callback_registration; 95 96 static gatt_client_notification_t notification_listener; 97 static int listener_registered; 98 99 static void printUUID(uint8_t * uuid128, uint16_t uuid16){ 100 if (uuid16){ 101 printf("%04x",uuid16); 102 } else { 103 printf("%s", uuid128_to_str(uuid128)); 104 } 105 } 106 107 static int blacklist_size(void){ 108 return sizeof(blacklist) / sizeof(bd_addr_t); 109 } 110 111 static int blacklist_contains(bd_addr_t addr){ 112 int i; 113 for (i=0; i<blacklist_size(); i++){ 114 if (bd_addr_cmp(addr, blacklist[i]) == 0) return 1; 115 } 116 return 0; 117 } 118 119 static void add_to_blacklist(bd_addr_t addr){ 120 printf("%s added to blacklist (no battery service found\n", bd_addr_to_str(addr)); 121 bd_addr_copy(blacklist[blacklist_index], addr); 122 blacklist_index = (blacklist_index + 1) % blacklist_size(); 123 } 124 125 static void dump_advertising_report(advertising_report_t * e){ 126 printf(" * adv. event: evt-type %u, addr-type %u, addr %s, rssi %u, length adv %u, data: ", e->event_type, 127 e->address_type, bd_addr_to_str(e->address), e->rssi, e->length); 128 printf_hexdump(e->data, e->length); 129 130 } 131 132 static void dump_characteristic_value(uint8_t * blob, uint16_t blob_length){ 133 printf(" * characteristic value of length %d *** ", blob_length ); 134 printf_hexdump(blob , blob_length); 135 printf("\n"); 136 } 137 138 static void dump_characteristic(gatt_client_characteristic_t * characteristic){ 139 printf(" * characteristic: [0x%04x-0x%04x-0x%04x], properties 0x%02x, uuid ", 140 characteristic->start_handle, characteristic->value_handle, characteristic->end_handle, characteristic->properties); 141 printUUID(characteristic->uuid128, characteristic->uuid16); 142 printf("\n"); 143 } 144 145 static void dump_service(gatt_client_service_t * service){ 146 printf(" * service: [0x%04x-0x%04x], uuid ", service->start_group_handle, service->end_group_handle); 147 printUUID(service->uuid128, service->uuid16); 148 printf("\n"); 149 } 150 151 152 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 153 UNUSED(packet_type); 154 UNUSED(channel); 155 UNUSED(size); 156 157 int status; 158 uint8_t battery_level; 159 160 switch(state){ 161 case TC_W4_SERVICE_RESULT: 162 switch(hci_event_packet_get_type(packet)){ 163 case GATT_EVENT_SERVICE_QUERY_RESULT: 164 gatt_event_service_query_result_get_service(packet, &battery_service); 165 dump_service(&battery_service); 166 break; 167 case GATT_EVENT_QUERY_COMPLETE: 168 if (packet[4] != 0){ 169 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 170 add_to_blacklist(report.address); 171 gap_disconnect(connection_handle); 172 break; 173 } 174 state = TC_W4_CHARACTERISTIC_RESULT; 175 printf("\nSearch for battery level characteristic.\n"); 176 gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &battery_service, battery_level_characteristic_uuid); 177 break; 178 default: 179 break; 180 } 181 break; 182 183 case TC_W4_CHARACTERISTIC_RESULT: 184 switch(hci_event_packet_get_type(packet)){ 185 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 186 gatt_event_characteristic_query_result_get_characteristic(packet, &battery_level_characteristic); 187 dump_characteristic(&battery_level_characteristic); 188 break; 189 case GATT_EVENT_QUERY_COMPLETE: 190 if (packet[4] != 0){ 191 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 192 add_to_blacklist(report.address); 193 gap_disconnect(connection_handle); 194 break; 195 } 196 197 // register handler for notifications 198 listener_registered = 1; 199 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &battery_level_characteristic); 200 201 state = TC_W4_BATTERY_DATA; 202 printf("\nConfigure battery level characteristic for notify.\n"); 203 status = gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &battery_level_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 204 if (status != 0){ 205 printf("\nNotification not supported. Query value of characteristic.\n"); 206 gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &battery_level_characteristic); 207 } 208 209 break; 210 default: 211 break; 212 } 213 break; 214 case TC_W4_BATTERY_DATA: 215 switch(hci_event_packet_get_type(packet)){ 216 case GATT_EVENT_NOTIFICATION: 217 printf("\nBattery Data:\n"); 218 dump_characteristic_value(&packet[8], little_endian_read_16(packet, 6)); 219 break; 220 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 221 222 if (gatt_event_characteristic_value_query_result_get_value_length(packet) < 1) break; 223 battery_level = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 224 printf("Battery level %d \n", battery_level); 225 break; 226 227 case GATT_EVENT_QUERY_COMPLETE: 228 if (packet[4] != 0){ 229 printf("CHARACTERISTIC_VALUE_QUERY_RESULT - Error status %x.\n", packet[4]); 230 break; 231 } 232 break; 233 default: 234 printf("Unknown packet type %x\n", hci_event_packet_get_type(packet)); 235 break; 236 } 237 break; 238 239 default: 240 printf("error\n"); 241 break; 242 } 243 244 } 245 246 static void fill_advertising_report_from_packet(advertising_report_t * adv_report, uint8_t *packet){ 247 gap_event_advertising_report_get_address(packet, adv_report->address); 248 adv_report->event_type = gap_event_advertising_report_get_advertising_event_type(packet); 249 adv_report->address_type = gap_event_advertising_report_get_address_type(packet); 250 adv_report->rssi = gap_event_advertising_report_get_rssi(packet); 251 adv_report->length = gap_event_advertising_report_get_data_length(packet); 252 adv_report->data = gap_event_advertising_report_get_data(packet); 253 } 254 255 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 256 UNUSED(channel); 257 UNUSED(size); 258 259 if (packet_type != HCI_EVENT_PACKET) return; 260 261 uint8_t event = hci_event_packet_get_type(packet); 262 switch (event) { 263 case BTSTACK_EVENT_STATE: 264 // BTstack activated, get started 265 if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) break; 266 if (cmdline_addr_found){ 267 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 268 state = TC_W4_CONNECT; 269 gap_connect(cmdline_addr, 0); 270 break; 271 } 272 printf("Start scanning!\n"); 273 state = TC_W4_SCAN_RESULT; 274 gap_set_scan_parameters(0,0x0030, 0x0030); 275 gap_start_scan(); 276 break; 277 case GAP_EVENT_ADVERTISING_REPORT: 278 if (state != TC_W4_SCAN_RESULT) return; 279 fill_advertising_report_from_packet(&report, packet); 280 281 if (blacklist_contains(report.address)) { 282 break; 283 } 284 dump_advertising_report(&report); 285 // stop scanning, and connect to the device 286 state = TC_W4_CONNECT; 287 gap_stop_scan(); 288 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(report.address)); 289 gap_connect(report.address,report.address_type); 290 291 break; 292 case HCI_EVENT_LE_META: 293 // wait for connection complete 294 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 295 if (state != TC_W4_CONNECT) return; 296 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 297 // initialize gatt client context with handle, and add it to the list of active clients 298 // query primary services 299 printf("\nSearch for battery service.\n"); 300 state = TC_W4_SERVICE_RESULT; 301 gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, battery_service_uuid); 302 break; 303 case HCI_EVENT_DISCONNECTION_COMPLETE: 304 // unregister listener 305 connection_handle = HCI_CON_HANDLE_INVALID; 306 if (listener_registered){ 307 listener_registered = 0; 308 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 309 } 310 311 if (cmdline_addr_found){ 312 printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr)); 313 return; 314 } 315 316 printf("\nDisconnected %s\n", bd_addr_to_str(report.address)); 317 printf("Restart scan.\n"); 318 state = TC_W4_SCAN_RESULT; 319 gap_start_scan(); 320 break; 321 default: 322 break; 323 } 324 } 325 326 #ifdef HAVE_BTSTACK_STDIN 327 static void usage(const char *name){ 328 fprintf(stderr, "\nUsage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 329 fprintf(stderr, "If no argument is provided, GATT browser will start scanning and connect to the first found device.\nTo connect to a specific device use argument [-a].\n\n"); 330 } 331 #endif 332 333 int btstack_main(int argc, const char * argv[]); 334 int btstack_main(int argc, const char * argv[]){ 335 336 #ifdef HAVE_BTSTACK_STDIN 337 int arg = 1; 338 cmdline_addr_found = 0; 339 340 while (arg < argc) { 341 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 342 arg++; 343 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 344 arg++; 345 if (!cmdline_addr_found) exit(1); 346 continue; 347 } 348 usage(argv[0]); 349 return 0; 350 } 351 #else 352 (void)argc; 353 (void)argv; 354 #endif 355 l2cap_init(); 356 357 // setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones 358 att_server_init(profile_data, NULL, NULL); 359 360 // GATT Client setup 361 gatt_client_init(); 362 363 sm_init(); 364 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 365 366 hci_event_callback_registration.callback = &hci_event_handler; 367 hci_add_event_handler(&hci_event_callback_registration); 368 369 370 // turn on! 371 hci_power_control(HCI_POWER_ON); 372 373 return 0; 374 } 375 376 /* EXAMPLE_END */ 377 378 379