BLE_Button is a BLE service template. It handles a read-only characteristic with a simple input (boolean values). The input's source is the button on the board itself - the characteristic's value changes when the button is pressed or released. The canonical source for this example lives at https://github.com/ARMmbed/mbed-os-example-ble/tree/master/BLE_Button
ButtonService.h
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00017 #ifndef __BLE_BUTTON_SERVICE_H__ 00018 #define __BLE_BUTTON_SERVICE_H__ 00019 00020 class ButtonService { 00021 public: 00022 const static uint16_t BUTTON_SERVICE_UUID = 0xA000; 00023 const static uint16_t BUTTON_STATE_CHARACTERISTIC_UUID = 0xA001; 00024 00025 ButtonService(BLE &_ble, bool buttonPressedInitial) : 00026 ble(_ble), buttonState(BUTTON_STATE_CHARACTERISTIC_UUID, &buttonPressedInitial, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY) 00027 { 00028 GattCharacteristic *charTable[] = {&buttonState}; 00029 GattService buttonService(ButtonService::BUTTON_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *)); 00030 ble.gattServer().addService(buttonService); 00031 } 00032 00033 void updateButtonState(bool newState) { 00034 ble.gattServer().write(buttonState.getValueHandle(), (uint8_t *)&newState, sizeof(bool)); 00035 } 00036 00037 private: 00038 BLE &ble; 00039 ReadOnlyGattCharacteristic<bool> buttonState; 00040 }; 00041 00042 #endif /* #ifndef __BLE_BUTTON_SERVICE_H__ */
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