/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.
*/
package android.bluetooth;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.os.ParcelUuid;
import android.os.RemoteException;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
/**
* Public API for the Bluetooth GATT Profile server role.
*
* <p>This class provides Bluetooth GATT server role functionality,
* allowing applications to create Bluetooth Smart services and
* characteristics.
*
* <p>BluetoothGattServer is a proxy object for controlling the Bluetooth Service
* via IPC. Use {@link BluetoothManager#openGattServer} to get an instance
* of this class.
*/
public final class BluetoothGattServer implements BluetoothProfile {
private static final String TAG = "BluetoothGattServer";
private static final boolean DBG = true;
private static final boolean VDBG = false;
private final Context mContext;
private BluetoothAdapter mAdapter;
private IBluetoothGatt mService;
private BluetoothGattServerCallback mCallback;
private Object mServerIfLock = new Object();
private int mServerIf;
private int mTransport;
private List<BluetoothGattService> mServices;
private static final int CALLBACK_REG_TIMEOUT = 10000;
/**
* Bluetooth GATT interface callbacks
*/
private final IBluetoothGattServerCallback mBluetoothGattServerCallback =
new IBluetoothGattServerCallback.Stub() {
/**
* Application interface registered - app is ready to go
* @hide
*/
public void onServerRegistered(int status, int serverIf) {
if (DBG) Log.d(TAG, "onServerRegistered() - status=" + status
+ " serverIf=" + serverIf);
synchronized(mServerIfLock) {
if (mCallback != null) {
mServerIf = serverIf;
mServerIfLock.notify();
} else {
// registration timeout
Log.e(TAG, "onServerRegistered: mCallback is null");
}
}
}
/**
* Callback reporting an LE scan result.
* @hide
*/
public void onScanResult(String address, int rssi, byte[] advData) {
if (VDBG) Log.d(TAG, "onScanResult() - Device=" + address + " RSSI=" +rssi);
// no op
}
/**
* Server connection state changed
* @hide
*/
public void onServerConnectionState(int status, int serverIf,
boolean connected, String address) {
if (DBG) Log.d(TAG, "onServerConnectionState() - status=" + status
+ " serverIf=" + serverIf + " device=" + address);
try {
mCallback.onConnectionStateChange(mAdapter.getRemoteDevice(address), status,
connected ? BluetoothProfile.STATE_CONNECTED :
BluetoothProfile.STATE_DISCONNECTED);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Service has been added
* @hide
*/
public void onServiceAdded(int status, int srvcType,
int srvcInstId, ParcelUuid srvcId) {
UUID srvcUuid = srvcId.getUuid();
if (DBG) Log.d(TAG, "onServiceAdded() - service=" + srvcUuid
+ "status=" + status);
BluetoothGattService service = getService(srvcUuid, srvcInstId, srvcType);
if (service == null) return;
try {
mCallback.onServiceAdded((int)status, service);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Remote client characteristic read request.
* @hide
*/
public void onCharacteristicReadRequest(String address, int transId,
int offset, boolean isLong, int srvcType, int srvcInstId,
ParcelUuid srvcId, int charInstId, ParcelUuid charId) {
UUID srvcUuid = srvcId.getUuid();
UUID charUuid = charId.getUuid();
if (VDBG) Log.d(TAG, "onCharacteristicReadRequest() - "
+ "service=" + srvcUuid + ", characteristic=" + charUuid);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
BluetoothGattService service = getService(srvcUuid, srvcInstId, srvcType);
if (service == null) return;
BluetoothGattCharacteristic characteristic = service.getCharacteristic(charUuid);
if (characteristic == null) return;
try {
mCallback.onCharacteristicReadRequest(device, transId, offset, characteristic);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Remote client descriptor read request.
* @hide
*/
public void onDescriptorReadRequest(String address, int transId,
int offset, boolean isLong, int srvcType, int srvcInstId,
ParcelUuid srvcId, int charInstId, ParcelUuid charId,
ParcelUuid descrId) {
UUID srvcUuid = srvcId.getUuid();
UUID charUuid = charId.getUuid();
UUID descrUuid = descrId.getUuid();
if (VDBG) Log.d(TAG, "onCharacteristicReadRequest() - "
+ "service=" + srvcUuid + ", characteristic=" + charUuid
+ "descriptor=" + descrUuid);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
BluetoothGattService service = getService(srvcUuid, srvcInstId, srvcType);
if (service == null) return;
BluetoothGattCharacteristic characteristic = service.getCharacteristic(charUuid);
if (characteristic == null) return;
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(descrUuid);
if (descriptor == null) return;
try {
mCallback.onDescriptorReadRequest(device, transId, offset, descriptor);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Remote client characteristic write request.
* @hide
*/
public void onCharacteristicWriteRequest(String address, int transId,
int offset, int length, boolean isPrep, boolean needRsp,
int srvcType, int srvcInstId, ParcelUuid srvcId,
int charInstId, ParcelUuid charId, byte[] value) {
UUID srvcUuid = srvcId.getUuid();
UUID charUuid = charId.getUuid();
if (VDBG) Log.d(TAG, "onCharacteristicWriteRequest() - "
+ "service=" + srvcUuid + ", characteristic=" + charUuid);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
BluetoothGattService service = getService(srvcUuid, srvcInstId, srvcType);
if (service == null) return;
BluetoothGattCharacteristic characteristic = service.getCharacteristic(charUuid);
if (characteristic == null) return;
try {
mCallback.onCharacteristicWriteRequest(device, transId, characteristic,
isPrep, needRsp, offset, value);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Remote client descriptor write request.
* @hide
*/
public void onDescriptorWriteRequest(String address, int transId,
int offset, int length, boolean isPrep, boolean needRsp,
int srvcType, int srvcInstId, ParcelUuid srvcId,
int charInstId, ParcelUuid charId, ParcelUuid descrId,
byte[] value) {
UUID srvcUuid = srvcId.getUuid();
UUID charUuid = charId.getUuid();
UUID descrUuid = descrId.getUuid();
if (VDBG) Log.d(TAG, "onDescriptorWriteRequest() - "
+ "service=" + srvcUuid + ", characteristic=" + charUuid
+ "descriptor=" + descrUuid);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
BluetoothGattService service = getService(srvcUuid, srvcInstId, srvcType);
if (service == null) return;
BluetoothGattCharacteristic characteristic = service.getCharacteristic(charUuid);
if (characteristic == null) return;
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(descrUuid);
if (descriptor == null) return;
try {
mCallback.onDescriptorWriteRequest(device, transId, descriptor,
isPrep, needRsp, offset, value);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* Execute pending writes.
* @hide
*/
public void onExecuteWrite(String address, int transId,
boolean execWrite) {
if (DBG) Log.d(TAG, "onExecuteWrite() - "
+ "device=" + address + ", transId=" + transId
+ "execWrite=" + execWrite);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
if (device == null) return;
try {
mCallback.onExecuteWrite(device, transId, execWrite);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception in callback", ex);
}
}
/**
* A notification/indication has been sent.
* @hide
*/
public void onNotificationSent(String address, int status) {
if (VDBG) Log.d(TAG, "onNotificationSent() - "
+ "device=" + address + ", status=" + status);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
if (device == null) return;
try {
mCallback.onNotificationSent(device, status);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception: " + ex);
}
}
/**
* The MTU for a connection has changed
* @hide
*/
public void onMtuChanged(String address, int mtu) {
if (DBG) Log.d(TAG, "onMtuChanged() - "
+ "device=" + address + ", mtu=" + mtu);
BluetoothDevice device = mAdapter.getRemoteDevice(address);
if (device == null) return;
try {
mCallback.onMtuChanged(device, mtu);
} catch (Exception ex) {
Log.w(TAG, "Unhandled exception: " + ex);
}
}
};
/**
* Create a BluetoothGattServer proxy object.
*/
/*package*/ BluetoothGattServer(Context context, IBluetoothGatt iGatt, int transport) {
mContext = context;
mService = iGatt;
mAdapter = BluetoothAdapter.getDefaultAdapter();
mCallback = null;
mServerIf = 0;
mTransport = transport;
mServices = new ArrayList<BluetoothGattService>();
}
/**
* Close this GATT server instance.
*
* Application should call this method as early as possible after it is done with
* this GATT server.
*/
public void close() {
if (DBG) Log.d(TAG, "close()");
unregisterCallback();
}
/**
* Register an application callback to start using GattServer.
*
* <p>This is an asynchronous call. The callback is used to notify
* success or failure if the function returns true.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param callback GATT callback handler that will receive asynchronous
* callbacks.
* @return true, the callback will be called to notify success or failure,
* false on immediate error
*/
/*package*/ boolean registerCallback(BluetoothGattServerCallback callback) {
if (DBG) Log.d(TAG, "registerCallback()");
if (mService == null) {
Log.e(TAG, "GATT service not available");
return false;
}
UUID uuid = UUID.randomUUID();
if (DBG) Log.d(TAG, "registerCallback() - UUID=" + uuid);
synchronized(mServerIfLock) {
if (mCallback != null) {
Log.e(TAG, "App can register callback only once");
return false;
}
mCallback = callback;
try {
mService.registerServer(new ParcelUuid(uuid), mBluetoothGattServerCallback);
} catch (RemoteException e) {
Log.e(TAG,"",e);
mCallback = null;
return false;
}
try {
mServerIfLock.wait(CALLBACK_REG_TIMEOUT);
} catch (InterruptedException e) {
Log.e(TAG, "" + e);
mCallback = null;
}
if (mServerIf == 0) {
mCallback = null;
return false;
} else {
return true;
}
}
}
/**
* Unregister the current application and callbacks.
*/
private void unregisterCallback() {
if (DBG) Log.d(TAG, "unregisterCallback() - mServerIf=" + mServerIf);
if (mService == null || mServerIf == 0) return;
try {
mCallback = null;
mService.unregisterServer(mServerIf);
mServerIf = 0;
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Returns a service by UUID, instance and type.
* @hide
*/
/*package*/ BluetoothGattService getService(UUID uuid, int instanceId, int type) {
for(BluetoothGattService svc : mServices) {
if (svc.getType() == type &&
svc.getInstanceId() == instanceId &&
svc.getUuid().equals(uuid)) {
return svc;
}
}
return null;
}
/**
* Initiate a connection to a Bluetooth GATT capable device.
*
* <p>The connection may not be established right away, but will be
* completed when the remote device is available. A
* {@link BluetoothGattServerCallback#onConnectionStateChange} callback will be
* invoked when the connection state changes as a result of this function.
*
* <p>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.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @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
*/
public boolean connect(BluetoothDevice device, boolean autoConnect) {
if (DBG) Log.d(TAG, "connect() - device: " + device.getAddress() + ", auto: " + autoConnect);
if (mService == null || mServerIf == 0) return false;
try {
mService.serverConnect(mServerIf, device.getAddress(),
autoConnect ? false : true,mTransport); // autoConnect is inverse of "isDirect"
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Disconnects an established connection, or cancels a connection attempt
* currently in progress.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device Remote device
*/
public void cancelConnection(BluetoothDevice device) {
if (DBG) Log.d(TAG, "cancelConnection() - device: " + device.getAddress());
if (mService == null || mServerIf == 0) return;
try {
mService.serverDisconnect(mServerIf, device.getAddress());
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Send a response to a read or write request to a remote device.
*
* <p>This function must be invoked in when a remote read/write request
* is received by one of these callback methods:
*
* <ul>
* <li>{@link BluetoothGattServerCallback#onCharacteristicReadRequest}
* <li>{@link BluetoothGattServerCallback#onCharacteristicWriteRequest}
* <li>{@link BluetoothGattServerCallback#onDescriptorReadRequest}
* <li>{@link BluetoothGattServerCallback#onDescriptorWriteRequest}
* </ul>
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device The remote device to send this response to
* @param requestId The ID of the request that was received with the callback
* @param status The status of the request to be sent to the remote devices
* @param offset Value offset for partial read/write response
* @param value The value of the attribute that was read/written (optional)
*/
public boolean sendResponse(BluetoothDevice device, int requestId,
int status, int offset, byte[] value) {
if (VDBG) Log.d(TAG, "sendResponse() - device: " + device.getAddress());
if (mService == null || mServerIf == 0) return false;
try {
mService.sendResponse(mServerIf, device.getAddress(), requestId,
status, offset, value);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Send a notification or indication that a local characteristic has been
* updated.
*
* <p>A notification or indication is sent to the remote device to signal
* that the characteristic has been updated. This function should be invoked
* for every client that requests notifications/indications by writing
* to the "Client Configuration" descriptor for the given characteristic.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device The remote device to receive the notification/indication
* @param characteristic The local characteristic that has been updated
* @param confirm true to request confirmation from the client (indication),
* false to send a notification
* @throws IllegalArgumentException
* @return true, if the notification has been triggered successfully
*/
public boolean notifyCharacteristicChanged(BluetoothDevice device,
BluetoothGattCharacteristic characteristic, boolean confirm) {
if (VDBG) Log.d(TAG, "notifyCharacteristicChanged() - device: " + device.getAddress());
if (mService == null || mServerIf == 0) return false;
BluetoothGattService service = characteristic.getService();
if (service == null) return false;
if (characteristic.getValue() == null) {
throw new IllegalArgumentException("Chracteristic value is empty. Use "
+ "BluetoothGattCharacteristic#setvalue to update");
}
try {
mService.sendNotification(mServerIf, device.getAddress(),
service.getType(), service.getInstanceId(),
new ParcelUuid(service.getUuid()), characteristic.getInstanceId(),
new ParcelUuid(characteristic.getUuid()), confirm,
characteristic.getValue());
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Add a service to the list of services to be hosted.
*
* <p>Once a service has been addded to the the list, the service and its
* included characteristics will be provided by the local device.
*
* <p>If the local device has already exposed services when this function
* is called, a service update notification will be sent to all clients.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param service Service to be added to the list of services provided
* by this device.
* @return true, if the service has been added successfully
*/
public boolean addService(BluetoothGattService service) {
if (DBG) Log.d(TAG, "addService() - service: " + service.getUuid());
if (mService == null || mServerIf == 0) return false;
mServices.add(service);
try {
mService.beginServiceDeclaration(mServerIf, service.getType(),
service.getInstanceId(), service.getHandles(),
new ParcelUuid(service.getUuid()), service.isAdvertisePreferred());
List<BluetoothGattService> includedServices = service.getIncludedServices();
for (BluetoothGattService includedService : includedServices) {
mService.addIncludedService(mServerIf,
includedService.getType(),
includedService.getInstanceId(),
new ParcelUuid(includedService.getUuid()));
}
List<BluetoothGattCharacteristic> characteristics = service.getCharacteristics();
for (BluetoothGattCharacteristic characteristic : characteristics) {
int permission = ((characteristic.getKeySize() - 7) << 12)
+ characteristic.getPermissions();
mService.addCharacteristic(mServerIf,
new ParcelUuid(characteristic.getUuid()),
characteristic.getProperties(), permission);
List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors();
for (BluetoothGattDescriptor descriptor: descriptors) {
permission = ((characteristic.getKeySize() - 7) << 12)
+ descriptor.getPermissions();
mService.addDescriptor(mServerIf,
new ParcelUuid(descriptor.getUuid()), permission);
}
}
mService.endServiceDeclaration(mServerIf);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Removes a service from the list of services to be provided.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param service Service to be removed.
* @return true, if the service has been removed
*/
public boolean removeService(BluetoothGattService service) {
if (DBG) Log.d(TAG, "removeService() - service: " + service.getUuid());
if (mService == null || mServerIf == 0) return false;
BluetoothGattService intService = getService(service.getUuid(),
service.getInstanceId(), service.getType());
if (intService == null) return false;
try {
mService.removeService(mServerIf, service.getType(),
service.getInstanceId(), new ParcelUuid(service.getUuid()));
mServices.remove(intService);
} catch (RemoteException e) {
Log.e(TAG,"",e);
return false;
}
return true;
}
/**
* Remove all services from the list of provided services.
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*/
public void clearServices() {
if (DBG) Log.d(TAG, "clearServices()");
if (mService == null || mServerIf == 0) return;
try {
mService.clearServices(mServerIf);
mServices.clear();
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
/**
* Returns a list of GATT services offered by this device.
*
* <p>An application must call {@link #addService} to add a serice to the
* list of services offered by this device.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @return List of services. Returns an empty list
* if no services have been added yet.
*/
public List<BluetoothGattService> getServices() {
return mServices;
}
/**
* Returns a {@link BluetoothGattService} from the list of services offered
* by this device.
*
* <p>If multiple instances of the same service (as identified by UUID)
* exist, the first instance of the service is returned.
*
* <p>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 this device.
*/
public BluetoothGattService getService(UUID uuid) {
for (BluetoothGattService service : mServices) {
if (service.getUuid().equals(uuid)) {
return service;
}
}
return null;
}
/**
* 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<BluetoothDevice> getConnectedDevices() {
throw new UnsupportedOperationException
("Use BluetoothManager#getConnectedDevices instead.");
}
/**
* Not supported - please use
* {@link BluetoothManager#getDevicesMatchingConnectionStates(int, int[])}
* with {@link BluetoothProfile#GATT} as first argument
*
* @throws UnsupportedOperationException
*/
@Override
public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
throw new UnsupportedOperationException
("Use BluetoothManager#getDevicesMatchingConnectionStates instead.");
}
}
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