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 // 42 // BLE Client 43 // 44 // ***************************************************************************** 45 46 #include <stdint.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "btstack.h" 52 53 // gatt_battery_query.gatt contains the declaration of the provided GATT Services + Characteristics 54 // gatt_battery_query.h contains the binary representation of gatt_battery_query.gatt 55 // it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py gatt_battery_query.gatt gatt_battery_query.h 56 // it needs to be regenerated when the GATT Database declared in gatt_battery_query.gatt file is modified 57 #include "gatt_battery_query.h" 58 59 typedef struct advertising_report { 60 uint8_t type; 61 uint8_t event_type; 62 uint8_t address_type; 63 bd_addr_t address; 64 uint8_t rssi; 65 uint8_t length; 66 const uint8_t * data; 67 } advertising_report_t; 68 69 70 typedef enum { 71 TC_IDLE, 72 TC_W4_SCAN_RESULT, 73 TC_W4_CONNECT, 74 TC_W4_SERVICE_RESULT, 75 TC_W4_CHARACTERISTIC_RESULT, 76 TC_W4_BATTERY_DATA 77 } gc_state_t; 78 79 static int blacklist_index = 0; 80 static bd_addr_t blacklist[20]; 81 static advertising_report_t report; 82 83 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 84 85 static bd_addr_t cmdline_addr; 86 static int cmdline_addr_found = 0; 87 88 static hci_con_handle_t connection_handle; 89 static uint16_t battery_service_uuid = 0x180F; 90 static uint16_t battery_level_characteristic_uuid = 0x2a19; 91 static gatt_client_service_t battery_service; 92 static gatt_client_characteristic_t config_characteristic; 93 94 static gc_state_t state = TC_IDLE; 95 static btstack_packet_callback_registration_t hci_event_callback_registration; 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 static void dump_service(gatt_client_service_t * service){ 144 printf(" * service: [0x%04x-0x%04x], uuid ", service->start_group_handle, service->end_group_handle); 145 printUUID(service->uuid128, service->uuid16); 146 printf("\n"); 147 } 148 149 150 static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 151 UNUSED(packet_type); 152 UNUSED(channel); 153 UNUSED(size); 154 155 int status; 156 uint8_t battery_level; 157 158 switch(state){ 159 case TC_W4_SERVICE_RESULT: 160 switch(hci_event_packet_get_type(packet)){ 161 case GATT_EVENT_SERVICE_QUERY_RESULT: 162 gatt_event_service_query_result_get_service(packet, &battery_service); 163 dump_service(&battery_service); 164 break; 165 case GATT_EVENT_QUERY_COMPLETE: 166 if (packet[4] != 0){ 167 printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]); 168 add_to_blacklist(report.address); 169 gap_disconnect(connection_handle); 170 break; 171 } 172 state = TC_W4_CHARACTERISTIC_RESULT; 173 printf("\nSearch for battery level characteristic.\n"); 174 gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &battery_service, battery_level_characteristic_uuid); 175 break; 176 default: 177 break; 178 } 179 break; 180 181 case TC_W4_CHARACTERISTIC_RESULT: 182 switch(hci_event_packet_get_type(packet)){ 183 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 184 gatt_event_characteristic_query_result_get_characteristic(packet, &config_characteristic); 185 dump_characteristic(&config_characteristic); 186 break; 187 case GATT_EVENT_QUERY_COMPLETE: 188 if (packet[4] != 0){ 189 printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]); 190 add_to_blacklist(report.address); 191 gap_disconnect(connection_handle); 192 break; 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, &config_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, &config_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; 253 254 uint8_t event = hci_event_packet_get_type(packet); 255 switch (event) { 256 case BTSTACK_EVENT_STATE: 257 // BTstack activated, get started 258 if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) break; 259 if (cmdline_addr_found){ 260 printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); 261 state = TC_W4_CONNECT; 262 gap_connect(cmdline_addr, 0); 263 break; 264 } 265 printf("Start scanning!\n"); 266 state = TC_W4_SCAN_RESULT; 267 gap_set_scan_parameters(0,0x0030, 0x0030); 268 gap_start_scan(); 269 break; 270 case GAP_EVENT_ADVERTISING_REPORT: 271 if (state != TC_W4_SCAN_RESULT) return; 272 fill_advertising_report_from_packet(&report, packet); 273 274 if (blacklist_contains(report.address)) { 275 break; 276 } 277 dump_advertising_report(&report); 278 // stop scanning, and connect to the device 279 state = TC_W4_CONNECT; 280 gap_stop_scan(); 281 printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(report.address)); 282 gap_connect(report.address,report.address_type); 283 284 break; 285 case HCI_EVENT_LE_META: 286 // wait for connection complete 287 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 288 if (state != TC_W4_CONNECT) return; 289 connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 290 // initialize gatt client context with handle, and add it to the list of active clients 291 // query primary services 292 printf("\nSearch for battery service.\n"); 293 state = TC_W4_SERVICE_RESULT; 294 gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, battery_service_uuid); 295 break; 296 case HCI_EVENT_DISCONNECTION_COMPLETE: 297 298 if (cmdline_addr_found){ 299 printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr)); 300 return; 301 } 302 303 printf("\nDisconnected %s\n", bd_addr_to_str(report.address)); 304 printf("Restart scan.\n"); 305 state = TC_W4_SCAN_RESULT; 306 gap_start_scan(); 307 break; 308 default: 309 break; 310 } 311 } 312 313 #ifdef HAVE_BTSTACK_STDIN 314 static void usage(const char *name){ 315 fprintf(stderr, "\nUsage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); 316 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"); 317 } 318 #endif 319 320 int btstack_main(int argc, const char * argv[]); 321 int btstack_main(int argc, const char * argv[]){ 322 323 #ifdef HAVE_BTSTACK_STDIN 324 int arg = 1; 325 cmdline_addr_found = 0; 326 327 while (arg < argc) { 328 if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ 329 arg++; 330 cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); 331 arg++; 332 if (!cmdline_addr_found) exit(1); 333 continue; 334 } 335 usage(argv[0]); 336 return 0; 337 } 338 #else 339 (void)argc; 340 (void)argv; 341 #endif 342 l2cap_init(); 343 344 // setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones 345 att_server_init(profile_data, NULL, NULL); 346 347 // GATT Client setup 348 gatt_client_init(); 349 350 sm_init(); 351 sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); 352 353 hci_event_callback_registration.callback = &hci_event_handler; 354 hci_add_event_handler(&hci_event_callback_registration); 355 356 357 // turn on! 358 hci_power_control(HCI_POWER_ON); 359 360 return 0; 361 } 362 363 364 365 366