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__ "battery_service_server.c" 39 40 /** 41 * Implementation of the GATT Battery Service Server 42 * To use with your application, add '#import <battery_service.gatt' to your .gatt file 43 */ 44 45 #include "btstack_defines.h" 46 #include "ble/att_db.h" 47 #include "ble/att_server.h" 48 #include "btstack_util.h" 49 #include "bluetooth_gatt.h" 50 51 #include "ble/gatt-service/battery_service_server.h" 52 53 static btstack_context_callback_registration_t battery_callback; 54 static att_service_handler_t battery_service; 55 56 static uint8_t battery_value; 57 static uint16_t battery_value_client_configuration; 58 static hci_con_handle_t battery_value_client_configuration_connection; 59 60 static uint16_t battery_value_handle_value; 61 static uint16_t battery_value_handle_client_configuration; 62 63 64 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){ 65 UNUSED(con_handle); 66 67 if (attribute_handle == battery_value_handle_value){ 68 return att_read_callback_handle_byte(battery_value, offset, buffer, buffer_size); 69 } 70 if (attribute_handle == battery_value_handle_client_configuration){ 71 return att_read_callback_handle_little_endian_16(battery_value_client_configuration, offset, buffer, buffer_size); 72 } 73 return 0; 74 } 75 76 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){ 77 UNUSED(transaction_mode); 78 UNUSED(offset); 79 UNUSED(buffer_size); 80 81 if (attribute_handle == battery_value_handle_client_configuration){ 82 battery_value_client_configuration = little_endian_read_16(buffer, 0); 83 battery_value_client_configuration_connection = con_handle; 84 } 85 return 0; 86 } 87 88 static void battery_service_can_send_now(void * context){ 89 hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context; 90 att_server_notify(con_handle, battery_value_handle_value, &battery_value, 1); 91 } 92 93 void battery_service_server_init(uint8_t value){ 94 95 battery_value = value; 96 97 // get service handle range 98 uint16_t start_handle = 0; 99 uint16_t end_handle = 0xfff; 100 int service_found = gatt_server_get_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE, &start_handle, &end_handle); 101 if (!service_found) return; 102 103 // get characteristic value handle and client configuration handle 104 battery_value_handle_value = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 105 battery_value_handle_client_configuration = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL); 106 107 // register service with ATT Server 108 battery_service.start_handle = start_handle; 109 battery_service.end_handle = end_handle; 110 battery_service.read_callback = &battery_service_read_callback; 111 battery_service.write_callback = &battery_service_write_callback; 112 att_server_register_service_handler(&battery_service); 113 } 114 115 void battery_service_server_set_battery_value(uint8_t value){ 116 battery_value = value; 117 if (battery_value_client_configuration){ 118 battery_callback.callback = &battery_service_can_send_now; 119 battery_callback.context = (void*) (uintptr_t) battery_value_client_configuration_connection; 120 att_server_register_can_send_now_callback(&battery_callback, battery_value_client_configuration_connection); 121 } 122 } 123