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 #ifndef btstack_gatt_client_h 40 #define btstack_gatt_client_h 41 42 #include "hci.h" 43 44 #if defined __cplusplus 45 extern "C" { 46 #endif 47 48 typedef enum { 49 P_READY, 50 P_W2_SEND_SERVICE_QUERY, 51 P_W4_SERVICE_QUERY_RESULT, 52 P_W2_SEND_SERVICE_WITH_UUID_QUERY, 53 P_W4_SERVICE_WITH_UUID_RESULT, 54 55 P_W2_SEND_ALL_CHARACTERISTICS_OF_SERVICE_QUERY, 56 P_W4_ALL_CHARACTERISTICS_OF_SERVICE_QUERY_RESULT, 57 P_W2_SEND_CHARACTERISTIC_WITH_UUID_QUERY, 58 P_W4_CHARACTERISTIC_WITH_UUID_QUERY_RESULT, 59 60 P_W2_SEND_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY, 61 P_W4_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT, 62 63 P_W2_SEND_INCLUDED_SERVICE_QUERY, 64 P_W4_INCLUDED_SERVICE_QUERY_RESULT, 65 P_W2_SEND_INCLUDED_SERVICE_WITH_UUID_QUERY, 66 P_W4_INCLUDED_SERVICE_UUID_WITH_QUERY_RESULT, 67 68 P_W2_SEND_READ_CHARACTERISTIC_VALUE_QUERY, 69 P_W4_READ_CHARACTERISTIC_VALUE_RESULT, 70 71 P_W2_SEND_READ_BLOB_QUERY, 72 P_W4_READ_BLOB_RESULT, 73 74 P_W2_SEND_READ_BY_TYPE_REQUEST, 75 P_W4_READ_BY_TYPE_RESPONSE, 76 77 P_W2_SEND_READ_MULTIPLE_REQUEST, 78 P_W4_READ_MULTIPLE_RESPONSE, 79 80 P_W2_SEND_WRITE_CHARACTERISTIC_VALUE, 81 P_W4_WRITE_CHARACTERISTIC_VALUE_RESULT, 82 83 P_W2_PREPARE_WRITE, 84 P_W4_PREPARE_WRITE_RESULT, 85 P_W2_PREPARE_RELIABLE_WRITE, 86 P_W4_PREPARE_RELIABLE_WRITE_RESULT, 87 88 P_W2_EXECUTE_PREPARED_WRITE, 89 P_W4_EXECUTE_PREPARED_WRITE_RESULT, 90 P_W2_CANCEL_PREPARED_WRITE, 91 P_W4_CANCEL_PREPARED_WRITE_RESULT, 92 P_W2_CANCEL_PREPARED_WRITE_DATA_MISMATCH, 93 P_W4_CANCEL_PREPARED_WRITE_DATA_MISMATCH_RESULT, 94 95 P_W2_SEND_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY, 96 P_W4_READ_CLIENT_CHARACTERISTIC_CONFIGURATION_QUERY_RESULT, 97 P_W2_WRITE_CLIENT_CHARACTERISTIC_CONFIGURATION, 98 P_W4_CLIENT_CHARACTERISTIC_CONFIGURATION_RESULT, 99 100 P_W2_SEND_READ_CHARACTERISTIC_DESCRIPTOR_QUERY, 101 P_W4_READ_CHARACTERISTIC_DESCRIPTOR_RESULT, 102 103 P_W2_SEND_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_QUERY, 104 P_W4_READ_BLOB_CHARACTERISTIC_DESCRIPTOR_RESULT, 105 106 P_W2_SEND_WRITE_CHARACTERISTIC_DESCRIPTOR, 107 P_W4_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT, 108 109 // all long writes use this 110 P_W2_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR, 111 P_W4_PREPARE_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT, 112 P_W2_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR, 113 P_W4_EXECUTE_PREPARED_WRITE_CHARACTERISTIC_DESCRIPTOR_RESULT, 114 115 // gatt reliable write API use this (manual version of the above) 116 P_W2_PREPARE_WRITE_SINGLE, 117 P_W4_PREPARE_WRITE_SINGLE_RESULT, 118 119 P_W4_CMAC_READY, 120 P_W4_CMAC_RESULT, 121 P_W2_SEND_SIGNED_WRITE, 122 P_W4_SEND_SINGED_WRITE_DONE, 123 } gatt_client_state_t; 124 125 126 typedef enum{ 127 SEND_MTU_EXCHANGE, 128 SENT_MTU_EXCHANGE, 129 MTU_EXCHANGED, 130 MTU_AUTO_EXCHANGE_DISABLED 131 } gatt_client_mtu_t; 132 133 typedef struct gatt_client{ 134 btstack_linked_item_t item; 135 // TODO: rename gatt_client_state -> state 136 gatt_client_state_t gatt_client_state; 137 138 // user callback 139 btstack_packet_handler_t callback; 140 141 // can write without response callback 142 btstack_packet_handler_t write_without_response_callback; 143 144 hci_con_handle_t con_handle; 145 146 uint8_t address_type; 147 bd_addr_t address; 148 uint16_t mtu; 149 gatt_client_mtu_t mtu_state; 150 151 uint16_t uuid16; 152 uint8_t uuid128[16]; 153 154 uint16_t start_group_handle; 155 uint16_t end_group_handle; 156 157 uint16_t query_start_handle; 158 uint16_t query_end_handle; 159 160 uint8_t characteristic_properties; 161 uint16_t characteristic_start_handle; 162 163 uint16_t attribute_handle; 164 uint16_t attribute_offset; 165 uint16_t attribute_length; 166 uint8_t* attribute_value; 167 168 // read multiple characteristic values 169 uint16_t read_multiple_handle_count; 170 uint16_t * read_multiple_handles; 171 172 uint16_t client_characteristic_configuration_handle; 173 uint8_t client_characteristic_configuration_value[2]; 174 175 uint8_t filter_with_uuid; 176 uint8_t send_confirmation; 177 178 int le_device_index; 179 uint8_t cmac[8]; 180 181 btstack_timer_source_t gc_timeout; 182 } gatt_client_t; 183 184 typedef struct gatt_client_notification { 185 btstack_linked_item_t item; 186 btstack_packet_handler_t callback; 187 hci_con_handle_t con_handle; 188 uint16_t attribute_handle; 189 } gatt_client_notification_t; 190 191 /* API_START */ 192 193 typedef struct { 194 uint16_t start_group_handle; 195 uint16_t end_group_handle; 196 uint16_t uuid16; 197 uint8_t uuid128[16]; 198 } gatt_client_service_t; 199 200 typedef struct { 201 uint16_t start_handle; 202 uint16_t value_handle; 203 uint16_t end_handle; 204 uint16_t properties; 205 uint16_t uuid16; 206 uint8_t uuid128[16]; 207 } gatt_client_characteristic_t; 208 209 typedef struct { 210 uint16_t handle; 211 uint16_t uuid16; 212 uint8_t uuid128[16]; 213 } gatt_client_characteristic_descriptor_t; 214 215 /** 216 * @brief Set up GATT client. 217 */ 218 void gatt_client_init(void); 219 220 /** 221 * @brief MTU is available after the first query has completed. If status is equal to 0, it returns the real value, otherwise the default value of 23. 222 */ 223 uint8_t gatt_client_get_mtu(hci_con_handle_t con_handle, uint16_t * mtu); 224 225 /** 226 * @brief Sets whether a MTU Exchange Request shall be automatically send before the first attribute read request is send. Default is enable.d 227 */ 228 void gatt_client_mtu_enable_auto_negotiation(uint8_t enabled); 229 230 /** 231 * @brief Sends a MTU Exchange Request, this allows for the client to exchange MTU when gatt_client_mtu_enable_auto_negotiation is disabled. 232 */ 233 void gatt_client_send_mtu_negotiation(btstack_packet_handler_t callback, hci_con_handle_t con_handle); 234 235 /** 236 * @brief Returns if the GATT client is ready to receive a query. It is used with daemon. 237 */ 238 int gatt_client_is_ready(hci_con_handle_t con_handle); 239 240 /** 241 * @brief Discovers all primary services. For each found service, an le_service_event_t with type set to GATT_EVENT_SERVICE_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t, with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. 242 */ 243 uint8_t gatt_client_discover_primary_services(btstack_packet_handler_t callback, hci_con_handle_t con_handle); 244 245 /** 246 * @brief Discovers a specific primary service given its UUID. This service may exist multiple times. For each found service, an le_service_event_t with type set to GATT_EVENT_SERVICE_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t, with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. 247 */ 248 uint8_t gatt_client_discover_primary_services_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t uuid16); 249 uint8_t gatt_client_discover_primary_services_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, const uint8_t * uuid); 250 251 /** 252 * @brief Finds included services within the specified service. For each found included service, an le_service_event_t with type set to GATT_EVENT_INCLUDED_SERVICE_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. Information about included service type (primary/secondary) can be retrieved either by sending an ATT find information request for the returned start group handle (returning the handle and the UUID for primary or secondary service) or by comparing the service to the list of all primary services. 253 */ 254 uint8_t gatt_client_find_included_services_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service); 255 256 /** 257 * @brief Discovers all characteristics within the specified service. For each found characteristic, an le_characteristics_event_t with type set to GATT_EVENT_CHARACTERISTIC_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. 258 */ 259 uint8_t gatt_client_discover_characteristics_for_service(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service); 260 261 /** 262 * @brief The following four functions are used to discover all characteristics within the specified service or handle range, and return those that match the given UUID. For each found characteristic, an le_characteristic_event_t with type set to GATT_EVENT_CHARACTERISTIC_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. 263 */ 264 uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16); 265 uint8_t gatt_client_discover_characteristics_for_handle_range_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * uuid); 266 uint8_t gatt_client_discover_characteristics_for_service_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service, uint16_t uuid16); 267 uint8_t gatt_client_discover_characteristics_for_service_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_service_t *service, uint8_t * uuid128); 268 269 /** 270 * @brief Discovers attribute handle and UUID of a characteristic descriptor within the specified characteristic. For each found descriptor, an le_characteristic_descriptor_event_t with type set to GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of discovery. 271 */ 272 uint8_t gatt_client_discover_characteristic_descriptors(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t *characteristic); 273 274 /** 275 * @brief Reads the characteristic value using the characteristic's value handle. If the characteristic value is found, an le_characteristic_value_event_t with type set to GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of read. 276 */ 277 uint8_t gatt_client_read_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t *characteristic); 278 uint8_t gatt_client_read_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle); 279 280 /** 281 * @brief Reads the characteric value of all characteristics with the uuid. For each found, an le_characteristic_value_event_t with type set to GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of read. 282 */ 283 uint8_t gatt_client_read_value_of_characteristics_by_uuid16(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint16_t uuid16); 284 uint8_t gatt_client_read_value_of_characteristics_by_uuid128(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t start_handle, uint16_t end_handle, uint8_t * uuid128); 285 286 /** 287 * @brief Reads the long characteristic value using the characteristic's value handle. The value will be returned in several blobs. For each blob, an le_characteristic_value_event_t with type set to GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT and updated value offset will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, mark the end of read. 288 */ 289 uint8_t gatt_client_read_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t *characteristic); 290 uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle); 291 uint8_t gatt_client_read_long_value_of_characteristic_using_value_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t offset); 292 293 /* 294 * @brief Read multiple characteristic values 295 * @param number handles 296 * @param list_of_handles list of handles 297 */ 298 uint8_t gatt_client_read_multiple_characteristic_values(btstack_packet_handler_t callback, hci_con_handle_t con_handle, int num_value_handles, uint16_t * value_handles); 299 300 /** 301 * @brief Writes the characteristic value using the characteristic's value handle without an acknowledgment that the write was successfully performed. 302 */ 303 uint8_t gatt_client_write_value_of_characteristic_without_response(hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t length, uint8_t * data); 304 305 /** 306 * @brief Writes the authenticated characteristic value using the characteristic's value handle without an acknowledgment that the write was successfully performed. 307 */ 308 uint8_t gatt_client_signed_write_without_response(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t handle, uint16_t message_len, uint8_t * message); 309 310 /** 311 * @brief Writes the characteristic value using the characteristic's value handle. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of write. The write is successfully performed, if the event's status field is set to 0. 312 */ 313 uint8_t gatt_client_write_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t length, uint8_t * data); 314 uint8_t gatt_client_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t length, uint8_t * data); 315 uint8_t gatt_client_write_long_value_of_characteristic_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t offset, uint16_t length, uint8_t * data); 316 317 /** 318 * @brief Writes of the long characteristic value using the characteristic's value handle. It uses server response to validate that the write was correctly received. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE marks the end of write. The write is successfully performed, if the event's status field is set to 0. 319 */ 320 uint8_t gatt_client_reliable_write_long_value_of_characteristic(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t characteristic_value_handle, uint16_t length, uint8_t * data); 321 322 /** 323 * @brief Reads the characteristic descriptor using its handle. If the characteristic descriptor is found, an le_characteristic_descriptor_event_t with type set to GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of read. 324 */ 325 uint8_t gatt_client_read_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor); 326 uint8_t gatt_client_read_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle); 327 328 /** 329 * @brief Reads the long characteristic descriptor using its handle. It will be returned in several blobs. For each blob, an le_characteristic_descriptor_event_t with type set to GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT will be generated and passed to the registered callback. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of read. 330 */ 331 uint8_t gatt_client_read_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor); 332 uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle); 333 uint8_t gatt_client_read_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset); 334 335 /** 336 * @brief Writes the characteristic descriptor using its handle. The gatt_complete_event_t with type set to GATT_EVENT_QUERY_COMPLETE, marks the end of write. The write is successfully performed, if the event's status field is set to 0. 337 */ 338 uint8_t gatt_client_write_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t length, uint8_t * data); 339 uint8_t gatt_client_write_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t length, uint8_t * data); 340 uint8_t gatt_client_write_long_characteristic_descriptor(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_descriptor_t * descriptor, uint16_t length, uint8_t * data); 341 uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t length, uint8_t * data); 342 uint8_t gatt_client_write_long_characteristic_descriptor_using_descriptor_handle_with_offset(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t descriptor_handle, uint16_t offset, uint16_t length, uint8_t * data); 343 344 /** 345 * @brief Writes the client characteristic configuration of the specified characteristic. It is used to subscribe for notifications or indications of the characteristic value. For notifications or indications specify: GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION resp. GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_INDICATION as configuration value. 346 */ 347 uint8_t gatt_client_write_client_characteristic_configuration(btstack_packet_handler_t callback, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic, uint16_t configuration); 348 349 /** 350 * @brief Register for notifications and indications of a characteristic enabled by gatt_client_write_client_characteristic_configuration 351 * @param notification struct used to store registration 352 * @param packet_handler 353 * @param con_handle 354 * @param characteristic 355 */ 356 void gatt_client_listen_for_characteristic_value_updates(gatt_client_notification_t * notification, btstack_packet_handler_t packet_handler, hci_con_handle_t con_handle, gatt_client_characteristic_t * characteristic); 357 358 /** 359 * @brief Stop listening to characteristic value updates registered with gatt_client_listen_for_characteristic_value_updates 360 * @param notification struct used in gatt_client_listen_for_characteristic_value_updates 361 */ 362 void gatt_client_stop_listening_for_characteristic_value_updates(gatt_client_notification_t * notification); 363 364 /** 365 * @brief Requests GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE that guarantees a single successful gatt_client_write_value_of_characteristic_without_response 366 * @param packet_handler 367 * @param con_handle 368 * @returns status 369 */ 370 uint8_t gatt_client_request_can_write_without_response_event(btstack_packet_handler_t callback, hci_con_handle_t con_handle); 371 372 /** 373 * @brief -> gatt complete event 374 */ 375 uint8_t gatt_client_prepare_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint16_t length, uint8_t * data); 376 377 /** 378 * @brief -> gatt complete event 379 */ 380 uint8_t gatt_client_execute_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle); 381 382 /** 383 * @brief -> gatt complete event 384 */ 385 uint8_t gatt_client_cancel_write(btstack_packet_handler_t callback, hci_con_handle_t con_handle); 386 387 /* API_END */ 388 389 // used by generated btstack_event.c 390 391 void gatt_client_deserialize_service(const uint8_t *packet, int offset, gatt_client_service_t *service); 392 void gatt_client_deserialize_characteristic(const uint8_t * packet, int offset, gatt_client_characteristic_t * characteristic); 393 void gatt_client_deserialize_characteristic_descriptor(const uint8_t * packet, int offset, gatt_client_characteristic_descriptor_t * descriptor); 394 395 #if defined __cplusplus 396 } 397 #endif 398 399 #endif 400