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:
22 months ago
Revision:
10:7943b5c1117a
Parent:
1:7202df456146

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__ */