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Release 0.2.8

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=============

Minor API enhancements to support LinkLoss service.

Enhancements
~~~~~~~~~~~~

* Introduce LinkLoss Service.
  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.link_loss.xml

* Add BLEDevice::addToDisconnectionCallChain(). This is in some sense parallel
  to the onDisconnection callback; but it allows for chaining and these
  callbacks don't receive any context.

* Some improvements to documentation.

Bugfixes
~~~~~~~~

Compatibility
~~~~~~~~~~~~~

This release is backward compatible with 0.2.4.
This commit is contained in:
Rohit Grover 2014-12-11 11:46:00 +00:00
parent eed20c82ce
commit 5ee435ea86
1 changed files with 103 additions and 0 deletions
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services/LinkLossService.h Normal file
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/* 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_LINK_LOSS_SERVICE_H__
#define __BLE_LINK_LOSS_SERVICE_H__
#include "Gap.h"
/**
* @class LinkLossService
* @brief This service defines behavior when a link is lost between two devices. <br>
* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.link_loss.xml <br>
* Alertness Level Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.alert_level.xml <br>
*/
class LinkLossService {
public:
enum AlertLevel_t {
NO_ALERT = 0,
MILD_ALERT = 1,
HIGH_ALERT = 2
};
typedef void (* callback_t)(AlertLevel_t level);
/**
* @param[ref] ble
* BLEDevice object for the underlying controller.
*/
LinkLossService(BLEDevice &bleIn, callback_t callbackIn, AlertLevel_t levelIn = NO_ALERT) :
ble(bleIn),
alertLevel(levelIn),
callback(callbackIn),
alertLevelChar(GattCharacteristic::UUID_ALERT_LEVEL_CHAR, reinterpret_cast<uint8_t *>(&alertLevel), sizeof(uint8_t), sizeof(uint8_t),
GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE) {
static bool serviceAdded = false; /* We should only ever add one LinkLoss service. */
if (serviceAdded) {
return;
}
GattCharacteristic *charTable[] = {&alertLevelChar};
GattService linkLossService(GattService::UUID_LINK_LOSS_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
ble.addService(linkLossService);
serviceAdded = true;
ble.addToDisconnectionCallChain(this, &LinkLossService::onDisconnectionFilter);
ble.onDataWritten(this, &LinkLossService::onDataWritten);
}
/**
* Update the callback.
*/
void setCallback(callback_t newCallback) {
callback = newCallback;
}
/**
* Update Alertness Level.
*/
void setAlertLevel(AlertLevel_t newLevel) {
alertLevel = newLevel;
}
private:
/**
* This callback allows receiving updates to the AlertLevel Characteristic.
*
* @param[in] params
* Information about the characterisitc being updated.
*/
virtual void onDataWritten(const GattCharacteristicWriteCBParams *params) {
if (params->charHandle == alertLevelChar.getValueHandle()) {
alertLevel = *reinterpret_cast<const AlertLevel_t *>(params->data);
}
}
void onDisconnectionFilter(void) {
if (alertLevel != NO_ALERT) {
callback(alertLevel);
}
}
private:
BLEDevice &ble;
AlertLevel_t alertLevel;
callback_t callback;
GattCharacteristic alertLevelChar;
};
#endif /* __BLE_LINK_LOSS_SERVICE_H__ */