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__ "ancs_client.c" 39 40 #include "btstack_config.h" 41 42 #include <stdint.h> 43 #include <string.h> 44 45 #include "ble/gatt-service/ancs_client.h" 46 47 #include "ble/core.h" 48 #include "ble/gatt_client.h" 49 #include "ble/sm.h" 50 #include "btstack_debug.h" 51 #include "btstack_event.h" 52 #include "btstack_run_loop.h" 53 #include "gap.h" 54 55 // ancs_client.h Start 56 typedef enum ancs_chunk_parser_state { 57 W4_ATTRIBUTE_ID, 58 W4_ATTRIBUTE_LEN, 59 W4_ATTRIBUTE_COMPLETE, 60 } ancs_chunk_parser_state_t; 61 62 typedef enum { 63 TC_IDLE, 64 TC_W4_ENCRYPTED_CONNECTION, 65 TC_W4_SERVICE_RESULT, 66 TC_W4_CHARACTERISTIC_RESULT, 67 TC_W4_DATA_SOURCE_SUBSCRIBED, 68 TC_W4_NOTIFICATION_SOURCE_SUBSCRIBED, 69 TC_SUBSCRIBED, 70 TC_W4_DISCONNECT 71 } tc_state_t; 72 73 static uint32_t ancs_notification_uid; 74 static uint16_t gc_handle; 75 static gatt_client_notification_t ancs_notification_source_notification; 76 static gatt_client_notification_t ancs_data_source_notification; 77 static int ancs_service_found; 78 static gatt_client_service_t ancs_service; 79 static gatt_client_characteristic_t ancs_notification_source_characteristic; 80 static gatt_client_characteristic_t ancs_control_point_characteristic; 81 static gatt_client_characteristic_t ancs_data_source_characteristic; 82 static int ancs_characteristcs; 83 static tc_state_t tc_state = TC_IDLE; 84 85 static ancs_chunk_parser_state_t chunk_parser_state; 86 static uint8_t ancs_notification_buffer[50]; 87 static uint16_t ancs_bytes_received; 88 static uint16_t ancs_bytes_needed; 89 static uint8_t ancs_attribute_id; 90 static uint16_t ancs_attribute_len; 91 92 static btstack_packet_handler_t client_handler; 93 static btstack_packet_callback_registration_t hci_event_callback_registration; 94 95 void ancs_client_register_callback(btstack_packet_handler_t handler){ 96 client_handler = handler; 97 } 98 99 static void notify_client_text(int event_type){ 100 if (!client_handler) return; 101 uint8_t event[7 + sizeof(ancs_notification_buffer) + 1]; 102 event[0] = HCI_EVENT_ANCS_META; 103 event[1] = 5u + ancs_attribute_len; 104 event[2] = event_type; 105 little_endian_store_16(event, 3, gc_handle); 106 little_endian_store_16(event, 5, ancs_attribute_id); 107 (void)memcpy(&event[7], ancs_notification_buffer, ancs_attribute_len); 108 // we're nice 109 event[7u+ancs_attribute_len] = 0u; 110 (*client_handler)(HCI_EVENT_PACKET, 0u, event, event[1u] + 2u); 111 } 112 113 static void notify_client_simple(int event_type){ 114 if (!client_handler) return; 115 uint8_t event[5]; 116 event[0] = HCI_EVENT_ANCS_META; 117 event[1] = 3; 118 event[2] = event_type; 119 little_endian_store_16(event, 3, gc_handle); 120 (*client_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 121 } 122 123 static void ancs_chunk_parser_init(void){ 124 chunk_parser_state = W4_ATTRIBUTE_ID; 125 ancs_bytes_received = 0; 126 ancs_bytes_needed = 6; 127 } 128 129 const char * ancs_client_attribute_name_for_id(int id){ 130 static const char * ancs_attribute_names[] = { 131 "AppIdentifier", 132 "IDTitle", 133 "IDSubtitle", 134 "IDMessage", 135 "IDMessageSize", 136 "IDDate" 137 }; 138 139 static const uint16_t ANCS_ATTRBUTE_NAMES_COUNT = sizeof(ancs_attribute_names) / sizeof(char *); 140 141 if (id >= ANCS_ATTRBUTE_NAMES_COUNT) return NULL; 142 return ancs_attribute_names[id]; 143 } 144 145 static void ancs_chunk_parser_handle_byte(uint8_t data){ 146 ancs_notification_buffer[ancs_bytes_received++] = data; 147 if (ancs_bytes_received < ancs_bytes_needed) return; 148 switch (chunk_parser_state){ 149 case W4_ATTRIBUTE_ID: 150 ancs_attribute_id = ancs_notification_buffer[ancs_bytes_received-1u]; 151 ancs_bytes_received = 0; 152 ancs_bytes_needed = 2; 153 chunk_parser_state = W4_ATTRIBUTE_LEN; 154 break; 155 case W4_ATTRIBUTE_LEN: 156 ancs_attribute_len = little_endian_read_16(ancs_notification_buffer, ancs_bytes_received-2u); 157 ancs_bytes_received = 0; 158 ancs_bytes_needed = ancs_attribute_len; 159 if (ancs_attribute_len == 0u) { 160 ancs_bytes_needed = 1; 161 chunk_parser_state = W4_ATTRIBUTE_ID; 162 break; 163 } 164 chunk_parser_state = W4_ATTRIBUTE_COMPLETE; 165 break; 166 case W4_ATTRIBUTE_COMPLETE: 167 ancs_notification_buffer[ancs_bytes_received] = 0; 168 notify_client_text(ANCS_SUBEVENT_CLIENT_NOTIFICATION); 169 ancs_bytes_received = 0; 170 ancs_bytes_needed = 1; 171 chunk_parser_state = W4_ATTRIBUTE_ID; 172 break; 173 default: 174 btstack_assert(false); 175 break; 176 } 177 } 178 179 static void handle_hci_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 180 181 UNUSED(packet_type); // ok: only hci events 182 UNUSED(channel); // ok: there is no channel 183 UNUSED(size); // ok: fixed format events read from HCI buffer 184 185 static const uint8_t ancs_service_uuid[] = {0x79,0x05,0xF4,0x31,0xB5,0xCE,0x4E,0x99,0xA4,0x0F,0x4B,0x1E,0x12,0x2D,0x00,0xD0}; 186 static const uint8_t ancs_notification_source_uuid[] = {0x9F,0xBF,0x12,0x0D,0x63,0x01,0x42,0xD9,0x8C,0x58,0x25,0xE6,0x99,0xA2,0x1D,0xBD}; 187 static const uint8_t ancs_control_point_uuid[] = {0x69,0xD1,0xD8,0xF3,0x45,0xE1,0x49,0xA8,0x98,0x21,0x9B,0xBD,0xFD,0xAA,0xD9,0xD9}; 188 static const uint8_t ancs_data_source_uuid[] = {0x22,0xEA,0xC6,0xE9,0x24,0xD6,0x4B,0xB5,0xBE,0x44,0xB3,0x6A,0xCE,0x7C,0x7B,0xFB}; 189 190 191 int connection_encrypted; 192 193 // handle connect / disconncet events first 194 switch (hci_event_packet_get_type(packet)) { 195 case HCI_EVENT_LE_META: 196 switch (packet[2]) { 197 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 198 gc_handle = little_endian_read_16(packet, 4); 199 log_info("Connection handle 0x%04x, request encryption", gc_handle); 200 201 // we need to be paired to enable notifications 202 tc_state = TC_W4_ENCRYPTED_CONNECTION; 203 sm_request_pairing(gc_handle); 204 break; 205 default: 206 break; 207 } 208 return; 209 210 case HCI_EVENT_ENCRYPTION_CHANGE: 211 if (gc_handle != little_endian_read_16(packet, 3)) return; 212 connection_encrypted = packet[5]; 213 log_info("Encryption state change: %u", connection_encrypted); 214 if (!connection_encrypted) return; 215 if (tc_state != TC_W4_ENCRYPTED_CONNECTION) return; 216 217 // let's start 218 log_info("\nANCS Client - CONNECTED, discover ANCS service"); 219 tc_state = TC_W4_SERVICE_RESULT; 220 gatt_client_discover_primary_services_by_uuid128(handle_hci_event, gc_handle, ancs_service_uuid); 221 return; 222 223 case HCI_EVENT_DISCONNECTION_COMPLETE: 224 if (hci_event_disconnection_complete_get_connection_handle(packet) != gc_handle) break; 225 if (tc_state == TC_SUBSCRIBED){ 226 notify_client_simple(ANCS_SUBEVENT_CLIENT_DISCONNECTED); 227 } 228 tc_state = TC_IDLE; 229 gc_handle = 0; 230 return; 231 232 default: 233 break; 234 } 235 236 gatt_client_characteristic_t characteristic; 237 uint8_t * value; 238 uint16_t value_handle; 239 uint16_t value_length; 240 241 switch(tc_state){ 242 case TC_W4_SERVICE_RESULT: 243 switch(hci_event_packet_get_type(packet)){ 244 case GATT_EVENT_SERVICE_QUERY_RESULT: 245 gatt_event_service_query_result_get_service(packet, &ancs_service); 246 ancs_service_found = 1; 247 break; 248 case GATT_EVENT_QUERY_COMPLETE: 249 if (!ancs_service_found){ 250 log_info("ANCS Service not found"); 251 tc_state = TC_IDLE; 252 break; 253 } 254 tc_state = TC_W4_CHARACTERISTIC_RESULT; 255 log_info("ANCS Client - Discover characteristics for ANCS SERVICE "); 256 gatt_client_discover_characteristics_for_service(handle_hci_event, gc_handle, &ancs_service); 257 break; 258 default: 259 break; 260 } 261 break; 262 263 case TC_W4_CHARACTERISTIC_RESULT: 264 switch(hci_event_packet_get_type(packet)){ 265 case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: 266 gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic); 267 if (memcmp(characteristic.uuid128, ancs_notification_source_uuid, 16) == 0){ 268 log_info("ANCS Notification Source found, attribute handle %u", characteristic.value_handle); 269 ancs_notification_source_characteristic = characteristic; 270 ancs_characteristcs++; 271 break; 272 } 273 if (memcmp(characteristic.uuid128, ancs_control_point_uuid, 16) == 0){ 274 log_info("ANCS Control Point found, attribute handle %u", characteristic.value_handle); 275 ancs_control_point_characteristic = characteristic; 276 ancs_characteristcs++; 277 break; 278 } 279 if (memcmp(characteristic.uuid128, ancs_data_source_uuid, 16) == 0){ 280 log_info("ANCS Data Source found, attribute handle %u", characteristic.value_handle); 281 ancs_data_source_characteristic = characteristic; 282 ancs_characteristcs++; 283 break; 284 } 285 break; 286 case GATT_EVENT_QUERY_COMPLETE: 287 log_info("ANCS Characteristcs count %u", ancs_characteristcs); 288 tc_state = TC_W4_NOTIFICATION_SOURCE_SUBSCRIBED; 289 gatt_client_listen_for_characteristic_value_updates(&ancs_notification_source_notification, &handle_hci_event, gc_handle, &ancs_notification_source_characteristic); 290 gatt_client_write_client_characteristic_configuration(handle_hci_event, gc_handle, &ancs_notification_source_characteristic, 291 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 292 break; 293 default: 294 break; 295 } 296 break; 297 case TC_W4_NOTIFICATION_SOURCE_SUBSCRIBED: 298 switch(hci_event_packet_get_type(packet)){ 299 case GATT_EVENT_QUERY_COMPLETE: 300 log_info("ANCS Notification Source subscribed"); 301 tc_state = TC_W4_DATA_SOURCE_SUBSCRIBED; 302 gatt_client_listen_for_characteristic_value_updates(&ancs_data_source_notification, &handle_hci_event, gc_handle, &ancs_data_source_characteristic); 303 gatt_client_write_client_characteristic_configuration(handle_hci_event, gc_handle, &ancs_data_source_characteristic, 304 GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); 305 break; 306 default: 307 break; 308 } 309 break; 310 case TC_W4_DATA_SOURCE_SUBSCRIBED: 311 switch(hci_event_packet_get_type(packet)){ 312 case GATT_EVENT_QUERY_COMPLETE: 313 log_info("ANCS Data Source subscribed"); 314 tc_state = TC_SUBSCRIBED; 315 notify_client_simple(ANCS_SUBEVENT_CLIENT_CONNECTED); 316 break; 317 default: 318 break; 319 } 320 break; 321 case TC_SUBSCRIBED: 322 if ((hci_event_packet_get_type(packet) != GATT_EVENT_NOTIFICATION) && (hci_event_packet_get_type(packet) != GATT_EVENT_INDICATION) ) break; 323 324 value_handle = little_endian_read_16(packet, 4); 325 value_length = little_endian_read_16(packet, 6); 326 value = &packet[8]; 327 328 log_info("ANCS Notification, value handle %u", value_handle); 329 330 if (value_handle == ancs_data_source_characteristic.value_handle){ 331 int i; 332 for (i=0;i<value_length;i++) { 333 ancs_chunk_parser_handle_byte(value[i]); 334 } 335 } else if (value_handle == ancs_notification_source_characteristic.value_handle){ 336 ancs_notification_uid = little_endian_read_32(value, 4); 337 log_info("Notification received: EventID %02x, EventFlags %02x, CategoryID %02x, CategoryCount %u, UID %04x", 338 value[0], value[1], value[2], value[3], (int) ancs_notification_uid); 339 static uint8_t get_notification_attributes[] = {0, 0,0,0,0, 0, 1,32,0, 2,32,0, 3,32,0, 4, 5}; 340 little_endian_store_32(get_notification_attributes, 1, ancs_notification_uid); 341 ancs_notification_uid = 0; 342 ancs_chunk_parser_init(); 343 gatt_client_write_value_of_characteristic(handle_hci_event, gc_handle, ancs_control_point_characteristic.value_handle, 344 sizeof(get_notification_attributes), get_notification_attributes); 345 } else { 346 log_info("Unknown Source: "); 347 log_info_hexdump(value , value_length); 348 } 349 break; 350 default: 351 break; 352 } 353 // app_run(); 354 } 355 356 void ancs_client_init(void){ 357 hci_event_callback_registration.callback = &handle_hci_event; 358 hci_add_event_handler(&hci_event_callback_registration); 359 } 360