Bluetooth Low Energy
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.
Diff: ButtonService.h
- Revision:
- 0:28f095301cb2
- Child:
- 1:7202df456146
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ButtonService.h Tue Feb 17 16:46:22 2015 +0000
@@ -0,0 +1,42 @@
+/* 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 = 0xA000;
+
+ ButtonService(BLEDevice &_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.addService(buttonService);
+ }
+
+ void updateButtonState(bool newState) {
+ ble.updateCharacteristicValue(buttonState.getValueHandle(), (uint8_t *)&newState, sizeof(bool));
+ }
+
+private:
+ BLEDevice &ble;
+ ReadOnlyGattCharacteristic<bool> buttonState;
+};
+
+#endif /* #ifndef __BLE_BUTTON_SERVICE_H__ */