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_cid; 89 static gatt_client_characteristic_t battery_level_characteristic; 90 91 static gc_state_t state = TC_IDLE; 92 static btstack_packet_callback_registration_t hci_event_callback_registration; 93 94 static gatt_client_notification_t notification_listener; 95 static int listener_registered; 96 97 static void printUUID(uint8_t * uuid128, uint16_t uuid16){ 98 if (uuid16){ 99 printf("%04x",uuid16); 100 } else { 101 printf("%s", uuid128_to_str(uuid128)); 102 } 103 } 104 105 static int blacklist_size(void){ 106 return sizeof(blacklist) / sizeof(bd_addr_t); 107 } 108 109 static int blacklist_contains(bd_addr_t addr){ 110 int i; 111 for (i=0; i<blacklist_size(); i++){ 112 if (bd_addr_cmp(addr, blacklist[i]) == 0) return 1; 113 } 114 return 0; 115 } 116 117 static void add_to_blacklist(bd_addr_t addr){ 118 printf("%s added to blacklist (no battery service found\n", bd_addr_to_str(addr)); 119 bd_addr_copy(blacklist[blacklist_index], addr); 120 blacklist_index = (blacklist_index + 1) % blacklist_size(); 121 } 122 123 static void dump_advertising_report(advertising_report_t * e){ 124 printf(" * adv. event: evt-type %u, addr-type %u, addr %s, rssi %u, length adv %u, data: ", e->event_type, 125 e->address_type, bd_addr_to_str(e->address), e->rssi, e->length); 126 printf_hexdump(e->data, e->length); 127 128 } 129 130 static void dump_characteristic_value(uint8_t * blob, uint16_t blob_length){ 131 printf(" * characteristic value of length %d *** ", blob_length ); 132 printf_hexdump(blob , blob_length); 133 printf("\n"); 134 } 135 136 static void dump_characteristic(gatt_client_characteristic_t * characteristic){ 137 printf(" * characteristic: [0x%04x-0x%04x-0x%04x], properties 0x%02x, uuid ", 138 characteristic->start_handle, characteristic->value_handle, characteristic->end_handle, characteristic->properties); 139 printUUID(characteristic->uuid128, characteristic->uuid16); 140 printf("\n"); 141 } 142 143 144 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 145 UNUSED(packet_type); 146 UNUSED(channel); 147 UNUSED(size); 148 149 int status; 150 uint8_t battery_level; 151 152 if (hci_event_packet_get_type(packet) != HCI_EVENT_GATTSERVICE_META){ 153 return; 154 } 155 156 switch (hci_event_gattservice_meta_get_subevent_code(packet)){ 157 case GATTSERVICE_SUBEVENT_BATTERY_SERVICE_CONNECTED: 158 status = gattservice_subevent_battery_service_connected_get_status(packet); 159 switch (status){ 160 case ERROR_CODE_SUCCESS: 161 printf("Battery service client connected - found %d services", 162 gattservice_subevent_battery_service_connected_get_num_instances(packet)); 163 break; 164 default: 165 printf("Battery service client connection failed - Error status 0x%02x.\n", status); 166 add_to_blacklist(report.address); 167 gap_disconnect(connection_handle); 168 break; 169 } 170 break; 171 default: 172 break; 173 } 174 175 switch(state){ 176 case TC_W4_CHARACTERISTIC_RESULT: 177 switch(hci_event_packet_get_type(packet)){ 178 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 179 gatt_event_characteristic_query_result_get_characteristic(packet, &battery_level_characteristic); 180 dump_characteristic(&battery_level_characteristic); 181 break; 182 case GATT_EVENT_QUERY_COMPLETE: 183 if (packet[4] != 0){ 184 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 185 add_to_blacklist(report.address); 186 gap_disconnect(connection_handle); 187 break; 188 } 189 190 // register handler for notifications 191 listener_registered = 1; 192 gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &battery_level_characteristic); 193 194 state = TC_W4_BATTERY_DATA; 195 printf("\nConfigure battery level characteristic for notify.\n"); 196 status = gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &battery_level_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 197 if (status != 0){ 198 printf("\nNotification not supported. Query value of characteristic.\n"); 199 gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &battery_level_characteristic); 200 } 201 202 break; 203 default: 204 break; 205 } 206 break; 207 case TC_W4_BATTERY_DATA: 208 switch(hci_event_packet_get_type(packet)){ 209 case GATT_EVENT_NOTIFICATION: 210 printf("\nBattery Data:\n"); 211 dump_characteristic_value(&packet[8], little_endian_read_16(packet, 6)); 212 break; 213 case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT: 214 215 if (gatt_event_characteristic_value_query_result_get_value_length(packet) < 1) break; 216 battery_level = gatt_event_characteristic_value_query_result_get_value(packet)[0]; 217 printf("Battery level %d \n", battery_level); 218 break; 219 220 case GATT_EVENT_QUERY_COMPLETE: 221 if (packet[4] != 0){ 222 printf("CHARACTERISTIC_VALUE_QUERY_RESULT - Error status %x.\n", packet[4]); 223 break; 224 } 225 break; 226 default: 227 printf("Unknown packet type %x\n", hci_event_packet_get_type(packet)); 228 break; 229 } 230 break; 231 232 default: 233 printf("error\n"); 234 break; 235 } 236 237 } 238 239 static void fill_advertising_report_from_packet(advertising_report_t * adv_report, uint8_t *packet){ 240 gap_event_advertising_report_get_address(packet, adv_report->address); 241 adv_report->event_type = gap_event_advertising_report_get_advertising_event_type(packet); 242 adv_report->address_type = gap_event_advertising_report_get_address_type(packet); 243 adv_report->rssi = gap_event_advertising_report_get_rssi(packet); 244 adv_report->length = gap_event_advertising_report_get_data_length(packet); 245 adv_report->data = gap_event_advertising_report_get_data(packet); 246 } 247 248 static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 249 UNUSED(channel); 250 UNUSED(size); 251 252 if (packet_type != HCI_EVENT_PACKET) return; 253 uint8_t status; 254 255 uint8_t event = hci_event_packet_get_type(packet); 256 switch (event) { 257 case BTSTACK_EVENT_STATE: 258 // BTstack activated, get started 259 if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) break; 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 break; 265 } 266 printf("Start scanning!\n"); 267 state = TC_W4_SCAN_RESULT; 268 gap_set_scan_parameters(0,0x0030, 0x0030); 269 gap_start_scan(); 270 break; 271 case GAP_EVENT_ADVERTISING_REPORT: 272 if (state != TC_W4_SCAN_RESULT) return; 273 fill_advertising_report_from_packet(&report, packet); 274 275 if (blacklist_contains(report.address)) { 276 break; 277 } 278 dump_advertising_report(&report); 279 // stop scanning, and connect to the device 280 state = TC_W4_CONNECT; 281 gap_stop_scan(); 282 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(report.address)); 283 gap_connect(report.address,report.address_type); 284 285 break; 286 case HCI_EVENT_LE_META: 287 // wait for connection complete 288 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 289 if (state != TC_W4_CONNECT) return; 290 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 291 // initialize gatt client context with handle, and add it to the list of active clients 292 // query primary services 293 printf("\nSearch for battery service.\n"); 294 status = battery_service_client_connect(connection_handle, handle_gatt_client_event, &battery_service_cid); 295 if (status == ERROR_CODE_SUCCESS){ 296 state = TC_W4_SERVICE_RESULT; 297 } 298 break; 299 case HCI_EVENT_DISCONNECTION_COMPLETE: 300 // unregister listener 301 connection_handle = HCI_CON_HANDLE_INVALID; 302 if (listener_registered){ 303 listener_registered = 0; 304 gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener); 305 } 306 307 if (cmdline_addr_found){ 308 printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr)); 309 return; 310 } 311 312 printf("\nDisconnected %s\n", bd_addr_to_str(report.address)); 313 printf("Restart scan.\n"); 314 state = TC_W4_SCAN_RESULT; 315 gap_start_scan(); 316 break; 317 default: 318 break; 319 } 320 } 321 322 #ifdef HAVE_BTSTACK_STDIN 323 static void usage(const char *name){ 324 fprintf(stderr, "\nUsage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 325 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"); 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 l2cap_init(); 352 353 // setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones 354 att_server_init(profile_data, NULL, NULL); 355 356 // GATT Client setup 357 gatt_client_init(); 358 battery_service_client_init(); 359 360 sm_init(); 361 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 362 363 hci_event_callback_registration.callback = &hci_event_handler; 364 hci_add_event_handler(&hci_event_callback_registration); 365 366 367 // turn on! 368 hci_power_control(HCI_POWER_ON); 369 370 return 0; 371 } 372 373 /* EXAMPLE_END */ 374 375 376