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