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129 lines
5.1 KiB
C
129 lines
5.1 KiB
C
/*
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* Copyright (C) 2014 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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/**
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* Implementation of the GATT Battery Service Server
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* To use with your application, add '#import <battery_service.gatt' to your .gatt file
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*/
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#include "btstack_defines.h"
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#include "ble/att_db.h"
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#include "ble/att_server.h"
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#include "btstack_util.h"
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#include "bluetooth_gatt.h"
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#include "ble/gatt-service/battery_service_server.h"
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static btstack_context_callback_registration_t battery_callback;
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static att_service_handler_t battery_service;
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static uint8_t battery_value;
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static uint16_t battery_value_client_configuration;
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static hci_con_handle_t battery_value_client_configuration_connection;
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static uint16_t battery_value_handle_value;
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static uint16_t battery_value_handle_client_configuration;
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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){
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UNUSED(offset);
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UNUSED(buffer_size);
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if (attribute_handle == battery_value_handle_value){
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if (buffer) {
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buffer[0] = battery_value;
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}
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return 1;
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}
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if (attribute_handle == battery_value_handle_client_configuration){
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if (buffer){
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little_endian_store_16(buffer, 0, battery_value_client_configuration);
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battery_value_client_configuration_connection = con_handle;
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}
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return 2;
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}
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return 0;
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}
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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){
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UNUSED(con_handle);
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UNUSED(transaction_mode);
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UNUSED(offset);
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UNUSED(buffer_size);
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if (attribute_handle == battery_value_handle_client_configuration){
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battery_value_client_configuration = little_endian_read_16(buffer, 0);
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}
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return 0;
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}
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static void battery_service_can_send_now(void * context){
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hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context;
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att_server_notify(con_handle, battery_value_handle_value, &battery_value, 1);
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}
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void battery_service_server_init(uint8_t value){
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battery_value = value;
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// get service handle range
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uint16_t start_handle = 0;
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uint16_t end_handle = 0xfff;
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int service_found = gatt_server_get_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE, &start_handle, &end_handle);
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if (!service_found) return;
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// get characteristic value handle and client configuration handle
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battery_value_handle_value = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
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battery_value_handle_client_configuration = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
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// register service with ATT DB
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battery_service.start_handle = start_handle;
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battery_service.end_handle = end_handle;
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battery_service.read_callback = &battery_service_read_callback;
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battery_service.write_callback = &battery_service_write_callback;
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att_register_service_handler(&battery_service);
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}
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void battery_service_server_set_battery_value(uint8_t value){
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battery_value = value;
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if (battery_value_client_configuration){
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battery_callback.callback = &battery_service_can_send_now;
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battery_callback.context = (void*) (uintptr_t) battery_value_client_configuration_connection;
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att_server_register_can_send_now_callback(&battery_callback, battery_value_client_configuration_connection);
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}
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}
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