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 * Implementation of the GATT Battery Service Server 40 * To use with your application, add '#import <battery_service.gatt' to your .gatt file 41 */ 42 43 #include "btstack_defines.h" 44 #include "ble/att_db.h" 45 #include "ble/att_server.h" 46 #include "btstack_util.h" 47 #include "bluetooth_gatt.h" 48 49 #include "ble/gatt-service/battery_service_server.h" 50 51 static btstack_context_callback_registration_t battery_callback; 52 static att_service_handler_t battery_service; 53 54 static uint8_t battery_value; 55 static uint16_t battery_value_client_configuration; 56 static hci_con_handle_t battery_value_client_configuration_connection; 57 58 static uint16_t battery_value_handle_value; 59 static uint16_t battery_value_handle_client_configuration; 60 61 62 static uint16_t battery_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 63 if (attribute_handle == battery_value_handle_value){ 64 if (buffer) { 65 buffer[0] = battery_value; 66 } 67 return 1; 68 } 69 if (attribute_handle == battery_value_handle_client_configuration){ 70 if (buffer){ 71 little_endian_store_16(buffer, 0, battery_value_client_configuration); 72 battery_value_client_configuration_connection = con_handle; 73 } 74 return 2; 75 } 76 return 0; 77 } 78 79 static int battery_service_write_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){ 80 if (attribute_handle == battery_value_handle_client_configuration){ 81 battery_value_client_configuration = little_endian_read_16(buffer, 0); 82 } 83 return 0; 84 } 85 86 static void battery_service_can_send_now(void * context){ 87 hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context; 88 att_server_notify(con_handle, battery_value_handle_value, &battery_value, 1); 89 } 90 91 void battery_service_server_init(uint8_t value){ 92 93 battery_value = value; 94 95 // get service handle range 96 uint16_t start_handle; 97 uint16_t end_handle; 98 int service_found = gatt_server_get_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE, &start_handle, &end_handle); 99 if (!service_found) return; 100 101 // get characteristic value handle and client configuration handle 102 battery_value_handle_value = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 103 battery_value_handle_client_configuration = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 104 105 // register service with ATT DB 106 battery_service.start_handle = start_handle; 107 battery_service.end_handle = end_handle; 108 battery_service.read_callback = &battery_service_read_callback; 109 battery_service.write_callback = &battery_service_write_callback; 110 att_register_service_handler(&battery_service); 111 } 112 113 void battery_service_server_set_battery_value(uint8_t value){ 114 battery_value = value; 115 if (battery_value_client_configuration){ 116 battery_callback.callback = &battery_service_can_send_now; 117 battery_callback.context = NULL; 118 att_server_register_can_send_now_callback(&battery_callback, battery_value_client_configuration_connection); 119 } 120 } 121