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