Working Android version using Blessed library.

BleConnect.java

@@ -1,267 +0,0 @@
-package st.wow.git.ble;
-
-import java.lang.Runnable;
-import java.lang.String;
-import java.util.List;
-import java.util.UUID;
-import android.util.Log;
-import java.lang.Class;
-import java.lang.ClassLoader;
-import java.lang.reflect.Constructor;
-import android.app.Activity;
-import android.app.Fragment;
-import android.os.Handler;
-import android.bluetooth.BluetoothAdapter;
-import android.bluetooth.BluetoothDevice;
-import android.bluetooth.BluetoothGatt;
-import android.bluetooth.BluetoothGattCallback;
-import android.bluetooth.BluetoothGattDescriptor;
-import android.bluetooth.BluetoothGattService;
-import android.bluetooth.BluetoothGattCharacteristic;
-import android.bluetooth.BluetoothManager;
-import android.bluetooth.BluetoothProfile;
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.content.pm.PackageManager;
-import android.Manifest;
-
-public class BleConnect extends Fragment {
-	BluetoothManager manager;
-	BluetoothAdapter adapter;
-	Handler handler;
-	boolean wantScan = false;
-
-	final int PERMISSION_REQUEST = 1;
-
-	final int REQUEST_ENABLE_BT = 1;
-
-	public BleConnect() {
-		Log.d("gio", "BleConnect()");
-	}
-
-	@Override public void onAttach(Context ctx) {
-		super.onAttach(ctx);
-		Log.d("gio", "BleConnect: onAttach()");
-		ctx.registerReceiver(receiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
-		manager = (BluetoothManager) ctx.getSystemService(ctx.BLUETOOTH_SERVICE);
-		adapter = manager.getAdapter();
-		handler = new Handler(ctx.getMainLooper());
-		if (!enabled()) {
-			Log.d("gio", "BleConnect: enabling adapter");
-			Intent enableBtIntent = new Intent(adapter.ACTION_REQUEST_ENABLE);
-			handler.post(new Runnable() {
-				public void run() {
-					startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
-				}
-			});
-		} else {
-			Log.d("gio", "BleConnect: adapter is enabled");
-		}
-		if (ctx.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
-                        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST);
-                }
-		installComplete(this);
-	}
-
-	public boolean enabled() {
-		return (adapter != null && adapter.isEnabled());
-	}
-
-	private final BroadcastReceiver receiver = new BroadcastReceiver() {
-		@Override
-		public void onReceive(Context context, Intent intent) {
-			Log.d("gio", "Received broadcast");
-			if (intent.getAction().equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
-				updateState(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1));
-			}
-		}
-	};
-
-	@Override
-	public void onDestroy() {
-		Log.d("gio","onDestroy()");
-		stopScan();
-		getContext().unregisterReceiver(receiver);
-		super.onDestroy();
-	}
-
-	private final BluetoothAdapter.LeScanCallback scanCallback = new BluetoothAdapter.LeScanCallback() {
-		public void onLeScan(final BluetoothDevice dev, int rssi, byte[] scanRecord) {
-			Log.d("gio","onLeScan(): " + dev.getName());
-			onScan(dev.getName(), dev.getAddress(), rssi, dev);
-		}
-	};
-
-	public void scan() {
-		if (!enabled() || getContext().checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
-			Log.d("gio","BleConnect: scan() not enabled or no permissions, wantScan = true");
-			wantScan = true;
-			return;
-		}
-		Log.d("gio","BleConnect: scan() starting scan");
-		wantScan = false;
-		handler.post(new Runnable() {
-			public void run() {
-				adapter.startLeScan(scanCallback);
-			}
-		});
-	}
-
-	public void stopScan() {
-		if (!enabled()) {
-			return;
-		}
-		Log.d("gio", "Stop scan");
-		handler.post(new Runnable() {
-			public void run() {
-				adapter.stopLeScan(scanCallback);
-			}
-		});
-	}
-
-	private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
-@Override
-		public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
-			switch (newState) {
-				case BluetoothProfile.STATE_CONNECTED: {
-					BluetoothDevice device = gatt.getDevice();
-					Log.d("gio", "Connected");
-					String addr = device.getAddress();
-					Log.d("gio", "Address = " + addr);
-					onConnect(gatt, device.getAddress());
-					break;
-				}
-				case BluetoothProfile.STATE_DISCONNECTED: {
-					Log.d("gio", "Disconnected");
-					break;
-				}
-				default: {
-					Log.d("gio", "onConnectionStateChange: unknown state");
-					break;
-				}
-			}
-		}
-		public void onServicesDiscovered(BluetoothGatt gatt, int status) {
-			for (BluetoothGattService serv : gatt.getServices()) {
-				onDiscoverService(gatt.getDevice().getAddress(), serv.getUuid().toString(), serv);
-			}
-		}
-		public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic chr) {
-			byte[] v = chr.getValue();
-			characteristicChanged(gatt.getDevice().getAddress(), chr.getUuid().toString(), chr, v, v.length);
-		}
-	};
-
-	public void connect(BluetoothDevice dev) {
-		if (dev == null) {
-			return;
-		}
-		Log.d("gio","BleConnect: connect");
-
-		handler.post(new Runnable() {
-			public void run() {
-				dev.connectGatt(getContext(), false, gattCallback, BluetoothDevice.TRANSPORT_LE);
-			}
-		});
-	}
-
-	public void disconnect(BluetoothGatt gatt) {
-		if (gatt == null) {
-			return;
-		}
-		Log.d("gio","BleConnect: disconnect");
-		handler.post(new Runnable() {
-			public void run() {
-				gatt.disconnect();
-			}
-		});
-	}
-
-	public void discoverServices(BluetoothGatt gatt) {
-		if (gatt == null) {
-			return;
-		}
-		handler.post(new Runnable() {
-			public void run() {
-				gatt.discoverServices();
-			}
-		});
-	}
-
-	public void discoverCharacteristics(BluetoothGatt gatt, BluetoothGattService serv) {
-		Log.d("gio","BleConnect: discoverCharacteristics()");
-		if (gatt == null) {
-			Log.d("gio","BleConnect: gatt == null");
-			return;
-		}
-		List<BluetoothGattCharacteristic> chrs = serv.getCharacteristics();
-		if (chrs.isEmpty()) {
-			Log.d("gio", "BleConnect: no characteristics found!");
-		}
-		for (BluetoothGattCharacteristic chr : chrs) {
-			Log.d("gio","BleConnect: -- " + chr.getUuid().toString());
-			onDiscoverCharacteristic(gatt.getDevice().getAddress(), serv.getUuid().toString(), serv, chr.getUuid().toString(), chr);
-		}
-	}
-
-	public void setCharacteristicNotification(BluetoothGatt gatt, BluetoothGattCharacteristic chr) {
-		gatt.setCharacteristicNotification(chr, true);
-
-		BluetoothGattDescriptor descriptor = chr.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb")); // Client Characteristic Config
-		descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
-		gatt.writeDescriptor(descriptor);
-	}
-
-	@Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
-		Log.d("gio", "BleConnect: onActivityResult()");
-		if (requestCode == REQUEST_ENABLE_BT) {
-			Log.d("gio", "BleConnect: onActivityResult() REQUEST_ENABLE_BT");
-			switch (resultCode) {
-				case Activity.RESULT_OK: {
-					Log.d("gio", "BleConnect: onActivityResult() -- OK");
-					if (wantScan) {
-						scan();
-					}
-					break;
-				}
-				case Activity.RESULT_CANCELED: {
-					Log.d("gio", "BleConnect: onActivityResult() -- Cancelled");
-					break;
-				}
-			}
-		}
-	}
-
-	@Override
-	public void onRequestPermissionsResult (int requestCode, String[] permissions, int[] grantResults) {
-		Log.d("gio", "BleConnect: onRequestPermissionsResult");
-		if (requestCode == PERMISSION_REQUEST) {
-			boolean granted = true;
-			for (int x : grantResults) {
-				if (x == PackageManager.PERMISSION_DENIED) {
-					granted = false;
-					break;
-				}
-			}
-			if (!granted) {
-				Log.d("gio", "BleConnect: permissions not granted");
-				return;
-			}
-			Log.d("gio", "BleConnect: permissions granted");
-			if (wantScan) {
-				scan();
-			}
-		}
-	}
-
-	static private native void installComplete(BleConnect p);
-	static private native void updateState(int s);
-	static private native void onScan(String name, String id, int rssi, BluetoothDevice dev);
-	static private native void onConnect(BluetoothGatt gatt, String id);
-	static private native void onDiscoverService(String id, String uuid, BluetoothGattService serv);
-	static private native void onDiscoverCharacteristic(String id, String suuid, BluetoothGattService serv, String cuuid, BluetoothGattCharacteristic chr);
-	static private native void characteristicChanged(String id, String cuuid, BluetoothGattCharacteristic chr, byte[] value, int length);
-}
-

BlessedConnect.java

@@ -18,8 +18,6 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.Manifest;
-import android.os.Handler;
-import android.os.HandlerThread;
 import android.util.Log;
 
 import com.welie.blessed.BluetoothCentral;
@@ -45,11 +43,7 @@ public class BlessedConnect extends Fragment {
 		if (ctx.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                         requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST);
                 }
-		Log.d("gio", "BlessedConnect: creating HandlerThread");
+		central = new BluetoothCentral(ctx, centralCallback, null);
-		HandlerThread thread = new HandlerThread("Bluetooth Thread");
-thread.start();
-		Handler handler = new Handler(thread.getLooper());
-		central = new BluetoothCentral(ctx, centralCallback, handler);
 		installComplete(this);
 	}
 
@@ -67,9 +61,8 @@ thread.start();
 		Context ctx = getContext();
 		//The Blessed library does not expose this functionality, so
 		//we need to get our own BluetoothAdapter and check its status.
-		//BluetoothAdapter adapter = ((BluetoothManager)ctx.getSystemService(ctx.BLUETOOTH_SERVICE)).getAdapter();
+		BluetoothAdapter adapter = ((BluetoothManager)ctx.getSystemService(ctx.BLUETOOTH_SERVICE)).getAdapter();
-		//return (adapter != null && adapter.isEnabled());
+		return (adapter != null && adapter.isEnabled());
-		return true;
 	}
 
 	@Override
@@ -81,12 +74,10 @@ thread.start();
 	}
 
 	public void scan() {
-		Log.d("gio", "BlessedConnect: Scan");
 		central.scanForPeripherals();
 	}
 
 	public void stopScan() {
-		Log.d("gio", "BlessedConnect: Stop scan");
 		central.stopScan();
 	}
 
@@ -117,7 +108,6 @@ thread.start();
 		@Override
 		public void onScanFailed(int errorCode) {
 			Log.d("gio", "BlessedConnect: Scan failed");
-
 		}
 
 	};
@@ -135,20 +125,15 @@ thread.start();
 		public void onBondLost(BluetoothPeripheral peripheral) {
 			Log.d("gio", "BlessedConnect: onBondLost()");
 		}
-		public void onCharacteristicUpdate(BluetoothPeripheral peripheral, byte[] value, BluetoothGattCharacteristic characteristic) {
+		public void onCharacteristicUpdate(BluetoothPeripheral peripheral, byte[] value, BluetoothGattCharacteristic characteristic, int status) {
 			Log.d("gio", "BlessedConnect: onCharacteristicUpdate()");
 			characteristicChanged(peripheral.getAddress(), characteristic.getUuid().toString(), characteristic, value, value.length);
 		}
 		public void onCharacteristicWrite(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattCharacteristic characteristic, int status) {
 			Log.d("gio", "onCharacteristicWrite(): " + characteristic.getUuid().toString());
 		}
-		public void onDescriptorRead(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattDescriptor descriptor) {
+		public void onDescriptorRead(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattDescriptor descriptor, int status) {
 			Log.d("gio", "onDescriptorRead()");
-			if (value == BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE) {
-				Log.d("gio", "onDescriptorRead(): " + descriptor.getUuid().toString() + ": notification enabled");
-			} else {
-				Log.d("gio", "onDescriptorRead(): " + descriptor.getUuid().toString() + ": notification not enabled");
-			}
 		}
 		public void onDescriptorWrite(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattDescriptor descriptor, int status) {
 			Log.d("gio", "onDescriptorWrite(): " + descriptor.getUuid().toString());
@@ -156,16 +141,13 @@ thread.start();
 		public void onMtuChanged(BluetoothPeripheral peripheral, int mtu, int status) {
 			Log.d("gio", "onMtuChanged()");
 		}
-		public void onReadRemoteRssi(BluetoothPeripheral peripheral, int rssi, int status) {
+		public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
 			Log.d("gio", "onReadRemoteRssi");
 		}
 		public void onNotificationStateUpdate(BluetoothPeripheral peripheral, BluetoothGattCharacteristic characteristic, int status) {
 			if (status == BluetoothGatt.GATT_SUCCESS) {
 				if(peripheral.isNotifying(characteristic)) {
 					Log.i("gio", String.format("BlessedConnect: Notify set to 'on' for %s", characteristic.getUuid()));
-					BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
-					Log.d("gio", "Reading descriptor");
-					peripheral.readDescriptor(descriptor);
 				} else {
 					Log.i("gio", String.format("BlessedConnect: Notify set to 'off' for %s", characteristic.getUuid()));
 				}
@@ -205,6 +187,9 @@ thread.start();
 	}
 
 	public void discoverCharacteristics(BluetoothPeripheral peripheral, BluetoothGattService serv) {
+		if (peripheral == null || serv == null) {
+			return;
+		}
 		List<BluetoothGattCharacteristic> chrs = serv.getCharacteristics();
 		for (BluetoothGattCharacteristic chr : chrs) {
 			onDiscoverCharacteristic(peripheral.getAddress(), serv.getUuid().toString(), serv, chr.getUuid().toString(), chr);
@@ -212,9 +197,15 @@ thread.start();
 	}
 
 	public void readCharacteristic(BluetoothPeripheral peripheral, BluetoothGattCharacteristic chr) {
+		if (peripheral == null || chr == null) {
+			return;
+		}
 		peripheral.readCharacteristic(chr);
 	}
 	public boolean setCharacteristicNotification(BluetoothPeripheral peripheral, BluetoothGattCharacteristic chr) {
+		if (peripheral == null || chr == null) {
+			return false;
+		}
 		return peripheral.setNotify(chr, true);
 	}
 
@@ -269,4 +260,3 @@ thread.start();
 	static private native void onDiscoverCharacteristic(String id, String suuid, BluetoothGattService serv, String cuuid, BluetoothGattCharacteristic chr);
 	static private native void characteristicChanged(String id, String cuuid, BluetoothGattCharacteristic chr, byte[] value, int length);
 }
-

ble_android.go

@@ -24,7 +24,7 @@ import "C"
 // Types required for ble.go
 
 type bleHandle struct {
-	BleConnect C.jobject
+	BlessedConnect C.jobject
 	state int
 }
 
@@ -131,7 +131,7 @@ func (b *BLE) readyToScan() bool {
 	connect()
 	var ret bool
 	runInJVM(func(env *C.JNIEnv) {
-		ret = C.enabled(env, b.handle.BleConnect) == C.JNI_TRUE
+		ret = C.enabled(env, b.handle.BlessedConnect) == C.JNI_TRUE
 	})
 	return ret
 }
@@ -140,7 +140,7 @@ func (b *BLE) readyToScan() bool {
 func (b *BLE) scan() {
 	connect()
 	runInJVM(func(env *C.JNIEnv) {
-		C.scan(env, b.handle.BleConnect);
+		C.scan(env, b.handle.BlessedConnect);
 	})
 }
 
@@ -148,14 +148,14 @@ func (b *BLE) scan() {
 func (b *BLE) stopScan() {
 	connect()
 	runInJVM(func(env *C.JNIEnv) {
-		C.stopScan(env, b.handle.BleConnect);
+		C.stopScan(env, b.handle.BlessedConnect);
 	})
 }
 
 //connectPeripheral attempts to connect to a Peripheral
 func (b *BLE) connectPeripheral(x Peripheral) {
 	runInJVM(func(env *C.JNIEnv) {
-		C.connect(env, b.handle.BleConnect, x.peripheral)
+		C.connect(env, b.handle.BlessedConnect, x.peripheral)
 	})
 }
 
@@ -163,7 +163,7 @@ func (b *BLE) connectPeripheral(x Peripheral) {
 func (b *BLE) cancelConnection(p Peripheral) {
 	connect()
 	runInJVM(func(env *C.JNIEnv) {
-		C.disconnect(env, b.handle.BleConnect, p.peripheral)
+		C.disconnect(env, b.handle.BlessedConnect, p.peripheral)
 	})
 }
 
@@ -177,12 +177,12 @@ func (b *BLE) knownPeripheral(p Peripheral) (Peripheral, bool) {
 //DiscoverServices asks a Peripheral for its Services
 func (p Peripheral) DiscoverServices() {
 	//launch a goroutine because this function calls back directly
-	//from the same thread (underlying Java call is synchronous)
+	//from the same thread (the underlying Java call is synchronous)
 	go func() {
 		connect()
 		log.Printf("discovering services")
 		runInJVM(func(env *C.JNIEnv) {
-			C.discoverServices(env, gBLE.handle.BleConnect, p.peripheral)
+			C.discoverServices(env, gBLE.handle.BlessedConnect, p.peripheral)
 		})
 	}()
 }
@@ -191,23 +191,23 @@ func (p Peripheral) DiscoverServices() {
 //to a Service
 func (p Peripheral) DiscoverCharacteristics(serv Service) {
 	//launch a goroutine because this function calls back directly
-	//from the same thread (underlying Java call is synchronous)
+	//from the same thread (the underlying Java call is synchronous)
 	go func() {
 		connect()
 		log.Printf("discovering characteristics")
 		runInJVM(func(env *C.JNIEnv) {
-			C.discoverCharacteristics(env, gBLE.handle.BleConnect, p.peripheral, serv.service)
+			C.discoverCharacteristics(env, gBLE.handle.BlessedConnect, p.peripheral, serv.service)
 		})
-		log.Printf("discovering characteristics done")
 	}()
 }
 
 //SetNotifyValue subscribes to a characteristic
 func (p Peripheral) SetNotifyValue(c Characteristic) {
 	runInJVM(func(env *C.JNIEnv) {
-		C.readCharacteristic(env, gBLE.handle.BleConnect, p.peripheral, c.characteristic)
+		result := (C.setCharacteristicNotification(env, gBLE.handle.BlessedConnect, p.peripheral, c.characteristic) == C.JNI_TRUE)
-		//result := (C.setCharacteristicNotification(env, gBLE.handle.BleConnect, p.peripheral, c.characteristic) == C.JNI_TRUE)
+		if (!result) {
-		//log.Printf("setCharacteristicNotification: %s = %t", c.UUID, result)
+			log.Printf("setCharacteristicNotification: %s failed", c.UUID)
+		}
 	})
 }
 
@@ -236,10 +236,10 @@ func Java_st_wow_git_ble_BlessedConnect_installComplete(env *C.JNIEnv, class C.j
 	if (b == 0) {
 		log.Printf("BlessedConnect object is nil!")
 	}
-	gBLE.handle.BleConnect = (C.NewGlobalRef)(env,b)
+	gBLE.handle.BlessedConnect = (C.NewGlobalRef)(env,b)
 	h := app.PlatformHandle()
 	setJVM(h.JVM)
-	if C.enabled(env, gBLE.handle.BleConnect) == C.JNI_TRUE {
+	if C.enabled(env, gBLE.handle.BlessedConnect) == C.JNI_TRUE {
 		gBLE.handle.state = STATE_ON
 		gBLE.ready = true
 		gBLE.events <- UpdateStateEvent{State: gBLE.stringState()}
@@ -384,8 +384,6 @@ func goOnDiscoverCharacteristic(cid, csuuid *C.char, serv C.jobject, ccuuid *C.c
 func goOnCharacteristicChanged(cid, ccuuid *C.char, char C.jobject, cvalue *C.char, length C.jint) {
 	id := C.GoString(cid)
 	cuuid := C.GoString(ccuuid)
-	log.Printf("goOnCharacteristicChanged: %s", cuuid)
-	log.Printf("goOnCharacteristicChanged: length = %d", length)
 
 	var peripheral Peripheral
 	found := false