This class provides Bluetooth GATT functionality to enable communication * with Bluetooth Smart or Smart Ready devices. * *
To connect to a remote peripheral device, create a {@link BluetoothGattCallback}
* and call {@link BluetoothDevice#connectGatt} to get a instance of this class.
* GATT capable devices can be discovered using the Bluetooth device discovery or BLE
* scan process.
*/
public final class BluetoothGatt implements BluetoothProfile {
private static final String TAG = "BluetoothGatt";
private static final boolean DBG = true;
private static final boolean VDBG = true;
private final Context mContext;
private IBluetoothGatt mService;
private BluetoothGattCallback mCallback;
private int mClientIf;
private boolean mAuthRetry = false;
private BluetoothDevice mDevice;
private boolean mAutoConnect;
private int mConnState;
private final Object mStateLock = new Object();
private static final int CONN_STATE_IDLE = 0;
private static final int CONN_STATE_CONNECTING = 1;
private static final int CONN_STATE_CONNECTED = 2;
private static final int CONN_STATE_DISCONNECTING = 3;
private static final int CONN_STATE_CLOSED = 4;
private List This is an asynchronous call. The callback {@link BluetoothGattCallback#onAppRegistered}
* is used to notify success or failure if the function returns true.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param callback GATT callback handler that will receive asynchronous callbacks.
* @return If true, the callback will be called to notify success or failure,
* false on immediate error
*/
private boolean registerApp(BluetoothGattCallback callback) {
if (DBG) Log.d(TAG, "registerApp()");
if (mService == null) return false;
mCallback = callback;
UUID uuid = UUID.randomUUID();
if (DBG) Log.d(TAG, "registerApp() - UUID=" + uuid);
try {
mService.registerClient(new ParcelUuid(uuid), mBluetoothGattCallback);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Unregister the current application and callbacks.
*/
private void unregisterApp() {
if (DBG) Log.d(TAG, "unregisterApp() - mClientIf=" + mClientIf);
if (mService == null || mClientIf == 0) return;
try {
mCallback = null;
mService.unregisterClient(mClientIf);
mClientIf = 0;
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Initiate a connection to a Bluetooth GATT capable device.
*
* The connection may not be established right away, but will be
* completed when the remote device is available. A
* {@link BluetoothGattCallback#onConnectionStateChange} callback will be
* invoked when the connection state changes as a result of this function.
*
* The autoConnect paramter determines whether to actively connect to
* the remote device, or rather passively scan and finalize the connection
* when the remote device is in range/available. Generally, the first ever
* connection to a device should be direct (autoConnect set to false) and
* subsequent connections to known devices should be invoked with the
* autoConnect parameter set to true.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device Remote device to connect to
* @param autoConnect Whether to directly connect to the remote device (false)
* or to automatically connect as soon as the remote
* device becomes available (true).
* @return true, if the connection attempt was initiated successfully
*/
/*package*/ boolean connect(Boolean autoConnect, BluetoothGattCallback callback) {
if (DBG) Log.d(TAG, "connect() - device: " + mDevice.getAddress() + ", auto: " + autoConnect);
synchronized(mStateLock) {
if (mConnState != CONN_STATE_IDLE) {
throw new IllegalStateException("Not idle");
}
mConnState = CONN_STATE_CONNECTING;
}
if (!registerApp(callback)) {
synchronized(mStateLock) {
mConnState = CONN_STATE_IDLE;
}
Log.e(TAG, "Failed to register callback");
return false;
}
// the connection will continue after successful callback registration
mAutoConnect = autoConnect;
return true;
}
/**
* Disconnects an established connection, or cancels a connection attempt
* currently in progress.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*/
public void disconnect() {
if (DBG) Log.d(TAG, "cancelOpen() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return;
try {
mService.clientDisconnect(mClientIf, mDevice.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Connect back to remote device.
*
* This method is used to re-connect to a remote device after the
* connection has been dropped. If the device is not in range, the
* re-connection will be triggered once the device is back in range.
*
* @return true, if the connection attempt was initiated successfully
*/
public boolean connect() {
try {
mService.clientConnect(mClientIf, mDevice.getAddress(),
false); // autoConnect is inverse of "isDirect"
return true;
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
}
/**
* Return the remote bluetooth device this GATT client targets to
*
* @return remote bluetooth device
*/
public BluetoothDevice getDevice() {
return mDevice;
}
/**
* Discovers services offered by a remote device as well as their
* characteristics and descriptors.
*
* This is an asynchronous operation. Once service discovery is completed,
* the {@link BluetoothGattCallback#onServicesDiscovered} callback is
* triggered. If the discovery was successful, the remote services can be
* retrieved using the {@link #getServices} function.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return true, if the remote service discovery has been started
*/
public boolean discoverServices() {
if (DBG) Log.d(TAG, "discoverServices() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return false;
mServices.clear();
try {
mService.discoverServices(mClientIf, mDevice.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Returns a list of GATT services offered by the remote device.
*
* This function requires that service discovery has been completed
* for the given device.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return List of services on the remote device. Returns an empty list
* if service discovery has not yet been performed.
*/
public List This function requires that service discovery has been completed
* for the given device.
*
* If multiple instances of the same service (as identified by UUID)
* exist, the first instance of the service is returned.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param uuid UUID of the requested service
* @return BluetoothGattService if supported, or null if the requested
* service is not offered by the remote device.
*/
public BluetoothGattService getService(UUID uuid) {
for (BluetoothGattService service : mServices) {
if (service.getDevice().equals(mDevice) &&
service.getUuid().equals(uuid)) {
return service;
}
}
return null;
}
/**
* Reads the requested characteristic from the associated remote device.
*
* This is an asynchronous operation. The result of the read operation
* is reported by the {@link BluetoothGattCallback#onCharacteristicRead}
* callback.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param characteristic Characteristic to read from the remote device
* @return true, if the read operation was initiated successfully
*/
public boolean readCharacteristic(BluetoothGattCharacteristic characteristic) {
if ((characteristic.getProperties() &
BluetoothGattCharacteristic.PROPERTY_READ) == 0) return false;
if (DBG) Log.d(TAG, "readCharacteristic() - uuid: " + characteristic.getUuid());
if (mService == null || mClientIf == 0) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
BluetoothDevice device = service.getDevice();
if (device == null) return false;
try {
mService.readCharacteristic(mClientIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()), AUTHENTICATION_NONE);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Writes a given characteristic and its values to the associated remote device.
*
* Once the write operation has been completed, the
* {@link BluetoothGattCallback#onCharacteristicWrite} callback is invoked,
* reporting the result of the operation.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param characteristic Characteristic to write on the remote device
* @return true, if the write operation was initiated successfully
*/
public boolean writeCharacteristic(BluetoothGattCharacteristic characteristic) {
if ((characteristic.getProperties() & BluetoothGattCharacteristic.PROPERTY_WRITE) == 0
&& (characteristic.getProperties() &
BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE) == 0) return false;
if (DBG) Log.d(TAG, "writeCharacteristic() - uuid: " + characteristic.getUuid());
if (mService == null || mClientIf == 0) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
BluetoothDevice device = service.getDevice();
if (device == null) return false;
try {
mService.writeCharacteristic(mClientIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()),
characteristic.getWriteType(), AUTHENTICATION_NONE,
characteristic.getValue());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Reads the value for a given descriptor from the associated remote device.
*
* Once the read operation has been completed, the
* {@link BluetoothGattCallback#onDescriptorRead} callback is
* triggered, signaling the result of the operation.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param descriptor Descriptor value to read from the remote device
* @return true, if the read operation was initiated successfully
*/
public boolean readDescriptor(BluetoothGattDescriptor descriptor) {
if (DBG) Log.d(TAG, "readDescriptor() - uuid: " + descriptor.getUuid());
if (mService == null || mClientIf == 0) return false;
BluetoothGattCharacteristic characteristic = descriptor.getCharacteristic();
if (characteristic == null) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
BluetoothDevice device = service.getDevice();
if (device == null) return false;
try {
mService.readDescriptor(mClientIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()),
new ParcelUuid(descriptor.getUuid()), AUTHENTICATION_NONE);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Write the value of a given descriptor to the associated remote device.
*
* A {@link BluetoothGattCallback#onDescriptorWrite} callback is
* triggered to report the result of the write operation.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param descriptor Descriptor to write to the associated remote device
* @return true, if the write operation was initiated successfully
*/
public boolean writeDescriptor(BluetoothGattDescriptor descriptor) {
if (DBG) Log.d(TAG, "writeDescriptor() - uuid: " + descriptor.getUuid());
if (mService == null || mClientIf == 0) return false;
BluetoothGattCharacteristic characteristic = descriptor.getCharacteristic();
if (characteristic == null) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
BluetoothDevice device = service.getDevice();
if (device == null) return false;
try {
mService.writeDescriptor(mClientIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()),
new ParcelUuid(descriptor.getUuid()),
characteristic.getWriteType(), AUTHENTICATION_NONE,
descriptor.getValue());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Initiates a reliable write transaction for a given remote device.
*
* Once a reliable write transaction has been initiated, all calls
* to {@link #writeCharacteristic} are sent to the remote device for
* verification and queued up for atomic execution. The application will
* receive an {@link BluetoothGattCallback#onCharacteristicWrite} callback
* in response to every {@link #writeCharacteristic} call and is responsible
* for verifying if the value has been transmitted accurately.
*
* After all characteristics have been queued up and verified,
* {@link #executeReliableWrite} will execute all writes. If a characteristic
* was not written correctly, calling {@link #abortReliableWrite} will
* cancel the current transaction without commiting any values on the
* remote device.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return true, if the reliable write transaction has been initiated
*/
public boolean beginReliableWrite() {
if (DBG) Log.d(TAG, "beginReliableWrite() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return false;
try {
mService.beginReliableWrite(mClientIf, mDevice.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Executes a reliable write transaction for a given remote device.
*
* This function will commit all queued up characteristic write
* operations for a given remote device.
*
* A {@link BluetoothGattCallback#onReliableWriteCompleted} callback is
* invoked to indicate whether the transaction has been executed correctly.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return true, if the request to execute the transaction has been sent
*/
public boolean executeReliableWrite() {
if (DBG) Log.d(TAG, "executeReliableWrite() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return false;
try {
mService.endReliableWrite(mClientIf, mDevice.getAddress(), true);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Cancels a reliable write transaction for a given device.
*
* Calling this function will discard all queued characteristic write
* operations for a given remote device.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*/
public void abortReliableWrite(BluetoothDevice mDevice) {
if (DBG) Log.d(TAG, "abortReliableWrite() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return;
try {
mService.endReliableWrite(mClientIf, mDevice.getAddress(), false);
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Enable or disable notifications/indications for a given characteristic.
*
* Once notifications are enabled for a characteristic, a
* {@link BluetoothGattCallback#onCharacteristicChanged} callback will be
* triggered if the remote device indicates that the given characteristic
* has changed.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param characteristic The characteristic for which to enable notifications
* @param enable Set to true to enable notifications/indications
* @return true, if the requested notification status was set successfully
*/
public boolean setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
boolean enable) {
if (DBG) Log.d(TAG, "setCharacteristicNotification() - uuid: " + characteristic.getUuid()
+ " enable: " + enable);
if (mService == null || mClientIf == 0) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
BluetoothDevice device = service.getDevice();
if (device == null) return false;
try {
mService.registerForNotification(mClientIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()),
enable);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Clears the internal cache and forces a refresh of the services from the
* remote device.
* @hide
*/
public boolean refresh() {
if (DBG) Log.d(TAG, "refresh() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return false;
try {
mService.refreshDevice(mClientIf, mDevice.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Read the RSSI for a connected remote device.
*
* The {@link BluetoothGattCallback#onReadRemoteRssi} callback will be
* invoked when the RSSI value has been read.
*
* Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return true, if the RSSI value has been requested successfully
*/
public boolean readRemoteRssi() {
if (DBG) Log.d(TAG, "readRssi() - device: " + mDevice.getAddress());
if (mService == null || mClientIf == 0) return false;
try {
mService.readRemoteRssi(mClientIf, mDevice.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Not supported - please use {@link BluetoothManager#getConnectedDevices(int)}
* with {@link BluetoothProfile#GATT} as argument
*
* @throws UnsupportedOperationException
*/
@Override
public int getConnectionState(BluetoothDevice device) {
throw new UnsupportedOperationException("Use BluetoothManager#getConnectionState instead.");
}
/**
* Not supported - please use {@link BluetoothManager#getConnectedDevices(int)}
* with {@link BluetoothProfile#GATT} as argument
*
* @throws UnsupportedOperationException
*/
@Override
public List