A template for applications where some small amount of data needs to be notified to a phone app over BLE. It is a good starting point for notifications.
Dependencies: BLE_API mbed nRF51822
Demo for an Input Service
To help you create your own BLE services, we've created a series of service templates. The *input service template* demonstrates the use of a simple input (boolean values) from a read-only characteristic.
The template covers:
1. Setting up advertising and connection states.
2. Assigning UUIDs to the service and its characteristic.
3. Creating an input characteristic: read-only, boolean, with notifications. This characteristic is updated according to the button's state.
4. Constructing a service class and adding it to the BLE stack.
ButtonService.h
- Committer:
- andresag
- Date:
- 2015-12-30
- Revision:
- 10:7943b5c1117a
- Parent:
- 6:18d8750f39ee
File content as of revision 10:7943b5c1117a:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef __BLE_BUTTON_SERVICE_H__ #define __BLE_BUTTON_SERVICE_H__ class ButtonService { public: const static uint16_t BUTTON_SERVICE_UUID = 0xA000; const static uint16_t BUTTON_STATE_CHARACTERISTIC_UUID = 0xA001; ButtonService(BLE &_ble, bool buttonPressedInitial) : ble(_ble), buttonState(BUTTON_STATE_CHARACTERISTIC_UUID, &buttonPressedInitial, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY) { GattCharacteristic *charTable[] = {&buttonState}; GattService buttonService(ButtonService::BUTTON_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *)); ble.gattServer().addService(buttonService); } void updateButtonState(bool newState) { ble.gattServer().write(buttonState.getValueHandle(), (uint8_t *)&newState, sizeof(bool)); } private: BLE &ble; ReadOnlyGattCharacteristic<bool> buttonState; }; #endif /* #ifndef __BLE_BUTTON_SERVICE_H__ */