Dopo aver collegato un server GATT BLE, puoi utilizzare la connessione per scoprire quali servizi sono disponibili sul dispositivo, eseguire query sui dati del dispositivo e richiedere notifiche quando una determinata caratteristica GATT cambia.
Scopri i servizi
La prima cosa da fare dopo la connessione al server GATT sul dispositivo BLE è eseguire il rilevamento dei servizi. In questo modo vengono fornite informazioni sui servizi disponibili sul dispositivo remoto, nonché sulle caratteristiche del servizio e sui relativi descrittori. Nell'esempio seguente, una volta che il servizio si connette correttamente al dispositivo (indicato dalla chiamata appropriata alla funzione onConnectionStateChange()
di BluetoothGattCallback
), la funzione discoverServices()
esegue una query sulle informazioni dal dispositivo BLE.
Il servizio deve eseguire l'override della funzione onServicesDiscovered()
in BluetoothGattCallback
.
Questa funzione viene richiamata quando il dispositivo genera report sui servizi disponibili.
Kotlin
class BluetoothLeService : Service() { ... private val bluetoothGattCallback = object : BluetoothGattCallback() { override fun onConnectionStateChange(gatt: BluetoothGatt?, status: Int, newState: Int) { if (newState == BluetoothProfile.STATE_CONNECTED) { // successfully connected to the GATT Server broadcastUpdate(ACTION_GATT_CONNECTED) connectionState = STATE_CONNECTED // Attempts to discover services after successful connection. bluetoothGatt?.discoverServices() } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // disconnected from the GATT Server broadcastUpdate(ACTION_GATT_DISCONNECTED) connectionState = STATE_DISCONNECTED } } override fun onServicesDiscovered(gatt: BluetoothGatt?, status: Int) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED) } else { Log.w(BluetoothLeService.TAG, "onServicesDiscovered received: $status") } } } ... companion object { const val ACTION_GATT_CONNECTED = "com.example.bluetooth.le.ACTION_GATT_CONNECTED" const val ACTION_GATT_DISCONNECTED = "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED" const val ACTION_GATT_SERVICES_DISCOVERED = "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED" private const val STATE_DISCONNECTED = 0 private const val STATE_CONNECTED = 2 }
Java
class BluetoothLeService extends Service { public final static String ACTION_GATT_SERVICES_DISCOVERED = "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED"; ... private final BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (newState == BluetoothProfile.STATE_CONNECTED) { // successfully connected to the GATT Server connectionState = STATE_CONNECTED; broadcastUpdate(ACTION_GATT_CONNECTED); // Attempts to discover services after successful connection. bluetoothGatt.discoverServices(); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // disconnected from the GATT Server connectionState = STATE_DISCONNECTED; broadcastUpdate(ACTION_GATT_DISCONNECTED); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED); } else { Log.w(TAG, "onServicesDiscovered received: " + status); } } }; }
Il servizio utilizza le trasmissioni per notificare l'attività. Una volta rilevati i servizi, il servizio può chiamare
getServices()
per
ricevere i dati segnalati.
Kotlin
class BluetoothLeService : Service() { ... fun getSupportedGattServices(): List<BluetoothGattService?>? { return bluetoothGatt?.services } }
Java
class BluetoothLeService extends Service { ... public List<BluetoothGattService> getSupportedGattServices() { if (bluetoothGatt == null) return null; return bluetoothGatt.getServices(); } }
L'attività può quindi chiamare questa funzione quando riceve l'intent di trasmissione, a indicare che il rilevamento del servizio è terminato.
Kotlin
class DeviceControlActivity : AppCompatActivity() { ... private val gattUpdateReceiver: BroadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { when (intent.action) { BluetoothLeService.ACTION_GATT_CONNECTED -> { connected = true updateConnectionState(R.string.connected) } BluetoothLeService.ACTION_GATT_DISCONNECTED -> { connected = false updateConnectionState(R.string.disconnected) } BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED -> { // Show all the supported services and characteristics on the user interface. displayGattServices(bluetoothService?.getSupportedGattServices()) } } } } }
Java
class DeviceControlsActivity extends AppCompatActivity { ... private final BroadcastReceiver gattUpdateReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) { connected = true; updateConnectionState(R.string.connected); } else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) { connected = false; updateConnectionState(R.string.disconnected); } else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) { // Show all the supported services and characteristics on the user interface. displayGattServices(bluetoothService.getSupportedGattServices()); } } }; }
Lettura delle caratteristiche BLE
Una volta che l'app si è connessa a un server GATT e ha rilevato i servizi, può leggere e scrivere attributi, se supportati. Ad esempio, il seguente snippet esegue l'iterazione dei servizi e delle caratteristiche del server e li visualizza nella UI:
Kotlin
class DeviceControlActivity : Activity() { // Demonstrates how to iterate through the supported GATT // Services/Characteristics. // In this sample, we populate the data structure that is bound to the // ExpandableListView on the UI. private fun displayGattServices(gattServices: List<BluetoothGattService>?) { if (gattServices == null) return var uuid: String? val unknownServiceString: String = resources.getString(R.string.unknown_service) val unknownCharaString: String = resources.getString(R.string.unknown_characteristic) val gattServiceData: MutableList<HashMap<String, String>> = mutableListOf() val gattCharacteristicData: MutableList<ArrayList<HashMap<String, String>>> = mutableListOf() mGattCharacteristics = mutableListOf() // Loops through available GATT Services. gattServices.forEach { gattService -> val currentServiceData = HashMap<String, String>() uuid = gattService.uuid.toString() currentServiceData[LIST_NAME] = SampleGattAttributes.lookup(uuid, unknownServiceString) currentServiceData[LIST_UUID] = uuid gattServiceData += currentServiceData val gattCharacteristicGroupData: ArrayList<HashMap<String, String>> = arrayListOf() val gattCharacteristics = gattService.characteristics val charas: MutableList<BluetoothGattCharacteristic> = mutableListOf() // Loops through available Characteristics. gattCharacteristics.forEach { gattCharacteristic -> charas += gattCharacteristic val currentCharaData: HashMap<String, String> = hashMapOf() uuid = gattCharacteristic.uuid.toString() currentCharaData[LIST_NAME] = SampleGattAttributes.lookup(uuid, unknownCharaString) currentCharaData[LIST_UUID] = uuid gattCharacteristicGroupData += currentCharaData } mGattCharacteristics += charas gattCharacteristicData += gattCharacteristicGroupData } } }
Java
public class DeviceControlActivity extends Activity { ... // Demonstrates how to iterate through the supported GATT // Services/Characteristics. // In this sample, we populate the data structure that is bound to the // ExpandableListView on the UI. private void displayGattServices(List<BluetoothGattService> gattServices) { if (gattServices == null) return; String uuid = null; String unknownServiceString = getResources(). getString(R.string.unknown_service); String unknownCharaString = getResources(). getString(R.string.unknown_characteristic); ArrayList<HashMap<String, String>> gattServiceData = new ArrayList<HashMap<String, String>>(); ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData = new ArrayList<ArrayList<HashMap<String, String>>>(); mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>(); // Loops through available GATT Services. for (BluetoothGattService gattService : gattServices) { HashMap<String, String> currentServiceData = new HashMap<String, String>(); uuid = gattService.getUuid().toString(); currentServiceData.put( LIST_NAME, SampleGattAttributes. lookup(uuid, unknownServiceString)); currentServiceData.put(LIST_UUID, uuid); gattServiceData.add(currentServiceData); ArrayList<HashMap<String, String>> gattCharacteristicGroupData = new ArrayList<HashMap<String, String>>(); List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics(); ArrayList<BluetoothGattCharacteristic> charas = new ArrayList<BluetoothGattCharacteristic>(); // Loops through available Characteristics. for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) { charas.add(gattCharacteristic); HashMap<String, String> currentCharaData = new HashMap<String, String>(); uuid = gattCharacteristic.getUuid().toString(); currentCharaData.put( LIST_NAME, SampleGattAttributes.lookup(uuid, unknownCharaString)); currentCharaData.put(LIST_UUID, uuid); gattCharacteristicGroupData.add(currentCharaData); } mGattCharacteristics.add(charas); gattCharacteristicData.add(gattCharacteristicGroupData); } ... } ... }
Il servizio GATT fornisce un elenco di caratteristiche che puoi leggere dal
dispositivo. Per eseguire query sui dati, chiama la funzione readCharacteristic()
sul BluetoothGatt
, trasmettendo il valore BluetoothGattCharacteristic
che vuoi leggere.
Kotlin
class BluetoothLeService : Service() { ... fun readCharacteristic(characteristic: BluetoothGattCharacteristic) { bluetoothGatt?.let { gatt -> gatt.readCharacteristic(characteristic) } ?: run { Log.w(TAG, "BluetoothGatt not initialized") Return } } }
Java
class BluetoothLeService extends Service { ... public void readCharacteristic(BluetoothGattCharacteristic characteristic) { if (bluetoothGatt == null) { Log.w(TAG, "BluetoothGatt not initialized"); return; } bluetoothGatt.readCharacteristic(characteristic); } }
In questo esempio, il servizio implementa una funzione per chiamare readCharacteristic()
.
Si tratta di una chiamata asincrona. I risultati vengono inviati alla funzione BluetoothGattCallback
onCharacteristicRead()
.
Kotlin
class BluetoothLeService : Service() { ... private val bluetoothGattCallback = object : BluetoothGattCallback() { ... override fun onCharacteristicRead( gatt: BluetoothGatt, characteristic: BluetoothGattCharacteristic, status: Int ) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(BluetoothLeService.ACTION_DATA_AVAILABLE, characteristic) } } } }
Java
class BluetoothLeService extends Service { ... private final BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() { ... @Override public void onCharacteristicRead( BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status ) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } } }; }
Quando viene attivato un callback specifico, richiama il metodo helper broadcastUpdate()
appropriato e gli passa un'azione. Tieni presente che l'analisi dei dati in questa sezione viene eseguita in conformità con le specifiche del profilo di misurazione della frequenza cardiaca Bluetooth.
Kotlin
private fun broadcastUpdate(action: String, characteristic: BluetoothGattCharacteristic) { val intent = Intent(action) // This is special handling for the Heart Rate Measurement profile. Data // parsing is carried out as per profile specifications. when (characteristic.uuid) { UUID_HEART_RATE_MEASUREMENT -> { val flag = characteristic.properties val format = when (flag and 0x01) { 0x01 -> { Log.d(TAG, "Heart rate format UINT16.") BluetoothGattCharacteristic.FORMAT_UINT16 } else -> { Log.d(TAG, "Heart rate format UINT8.") BluetoothGattCharacteristic.FORMAT_UINT8 } } val heartRate = characteristic.getIntValue(format, 1) Log.d(TAG, String.format("Received heart rate: %d", heartRate)) intent.putExtra(EXTRA_DATA, (heartRate).toString()) } else -> { // For all other profiles, writes the data formatted in HEX. val data: ByteArray? = characteristic.value if (data?.isNotEmpty() == true) { val hexString: String = data.joinToString(separator = " ") { String.format("%02X", it) } intent.putExtra(EXTRA_DATA, "$data\n$hexString") } } } sendBroadcast(intent) }
Java
private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) { final Intent intent = new Intent(action); // This is special handling for the Heart Rate Measurement profile. Data // parsing is carried out as per profile specifications. if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) { int flag = characteristic.getProperties(); int format = -1; if ((flag & 0x01) != 0) { format = BluetoothGattCharacteristic.FORMAT_UINT16; Log.d(TAG, "Heart rate format UINT16."); } else { format = BluetoothGattCharacteristic.FORMAT_UINT8; Log.d(TAG, "Heart rate format UINT8."); } final int heartRate = characteristic.getIntValue(format, 1); Log.d(TAG, String.format("Received heart rate: %d", heartRate)); intent.putExtra(EXTRA_DATA, String.valueOf(heartRate)); } else { // For all other profiles, writes the data formatted in HEX. final byte[] data = characteristic.getValue(); if (data != null && data.length > 0) { final StringBuilder stringBuilder = new StringBuilder(data.length); for(byte byteChar : data) stringBuilder.append(String.format("%02X ", byteChar)); intent.putExtra(EXTRA_DATA, new String(data) + "\n" + stringBuilder.toString()); } } sendBroadcast(intent); }
Ricevere notifiche GATT
In genere, le app BLE richiedono di ricevere notifiche quando una determinata caratteristica cambia sul dispositivo. Nell'esempio seguente, il servizio implementa una funzione per chiamare il metodo setCharacteristicNotification()
:
Kotlin
class BluetoothLeService : Service() { ... fun setCharacteristicNotification( characteristic: BluetoothGattCharacteristic, enabled: Boolean ) { bluetoothGatt?.let { gatt -> gatt.setCharacteristicNotification(characteristic, enabled) // This is specific to Heart Rate Measurement. if (BluetoothLeService.UUID_HEART_RATE_MEASUREMENT == characteristic.uuid) { val descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG)) descriptor.value = BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE gatt.writeDescriptor(descriptor) } } ?: run { Log.w(BluetoothLeService.TAG, "BluetoothGatt not initialized") } } }
Java
class BluetoothLeService extends Service { ... public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,boolean enabled) { if (bluetoothGatt == null) { Log.w(TAG, "BluetoothGatt not initialized"); Return; } bluetoothGatt.setCharacteristicNotification(characteristic, enabled); // This is specific to Heart Rate Measurement. if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) { BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG)); descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); bluetoothGatt.writeDescriptor(descriptor); } } }
Una volta abilitate le notifiche per una caratteristica, viene attivato un callback onCharacteristicChanged()
se la caratteristica cambia sul dispositivo remoto:
Kotlin
class BluetoothLeService : Service() { ... private val bluetoothGattCallback = object : BluetoothGattCallback() { ... override fun onCharacteristicChanged( gatt: BluetoothGatt, characteristic: BluetoothGattCharacteristic ) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic) } } }
Java
class BluetoothLeService extends Service { ... private final BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() { ... @Override public void onCharacteristicChanged( BluetoothGatt gatt, BluetoothGattCharacteristic characteristic ) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } }; }