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BLE Service discovery working - next to check characteristics exist and subscribe to notifications from them.

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This commit is contained in:
Graham Jones
2020-08-08 22:25:34 +01:00
parent 7e2dce8c67
commit dc5a43040b
2 changed files with 250 additions and 10 deletions
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24
app/src/main/java/uk/org/openseizuredetector/GattAttributes.java Normal file
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@@ -0,0 +1,24 @@
package uk.org.openseizuredetector;
// Defines the servies and characteristics we need to subscribe to.
import java.util.HashMap;
public class GattAttributes {
private static HashMap<String, String> attributes = new HashMap();
public static String HEART_RATE_MEASUREMENT = "00002a37-0000-1000-8000-00805f9b34fb";
public static String CLIENT_CHARACTERISTIC_CONFIG = "00002902-0000-1000-8000-00805f9b34fb";
static {
// Sample Services.
attributes.put("0000180d-0000-1000-8000-00805f9b34fb", "Heart Rate Service");
attributes.put("0000180a-0000-1000-8000-00805f9b34fb", "Device Information Service");
// Sample Characteristics.
attributes.put("00002a37-0000-1000-8000-00805f9b34fb", "Heart Rate Measurement");
attributes.put("00002a29-0000-1000-8000-00805f9b34fb", "Manufacturer Name String");
}
public static String lookup(String uuid, String defaultName) {
String name = attributes.get(uuid);
return name == null ? defaultName : name;
}
}

236
app/src/main/java/uk/org/openseizuredetector/SdDataSourceBLE.java
View File

@@ -23,12 +23,23 @@
*/
package uk.org.openseizuredetector;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
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.SharedPreferences;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.text.format.Time;
import android.util.Log;
@@ -40,18 +51,42 @@ import org.json.JSONObject;
import org.jtransforms.fft.DoubleFFT_1D;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
/**
* A data source that registers for BLE GATT notifications from a device and
* waits to be notified of data being available. */
public class SdDataSourceBLE extends SdDataSource {
private SdDataBroadcastReceiver mSdDataBroadcastReceiver;
private String TAG = "SdDataSourceBLE";
private BluetoothManager mBluetoothManager;
private BluetoothAdapter mBluetoothAdapter;
private String mBluetoothDeviceAddress;
private BluetoothGatt mBluetoothGatt;
private int mConnectionState = STATE_DISCONNECTED;
private static final int STATE_DISCONNECTED = 0;
private static final int STATE_CONNECTING = 1;
private static final int STATE_CONNECTED = 2;
public final static String ACTION_GATT_CONNECTED =
"com.example.bluetooth.le.ACTION_GATT_CONNECTED";
public final static String ACTION_GATT_DISCONNECTED =
"com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
public final static String ACTION_GATT_SERVICES_DISCOVERED =
"com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
public final static String ACTION_DATA_AVAILABLE =
"com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
public final static String EXTRA_DATA =
"com.example.bluetooth.le.EXTRA_DATA";
public final static UUID UUID_HEART_RATE_MEASUREMENT =
UUID.fromString(GattAttributes.HEART_RATE_MEASUREMENT);
public SdDataSourceBLE(Context context, Handler handler,
@@ -79,6 +114,36 @@ public class SdDataSourceBLE extends SdDataSource {
mContext.startActivity(intent);
}
Log.i(TAG,"mBLEDevice is "+mBleDeviceName+", Addr="+mBleDeviceAddr);
// Now we have selected a BLE Device, open the bluetooth adapter and connect to it.
if (mBluetoothManager == null) {
mBluetoothManager = (BluetoothManager) mContext.getSystemService(Context.BLUETOOTH_SERVICE);
if (mBluetoothManager == null) {
Log.e(TAG, "Unable to initialize BluetoothManager.");
}
}
mBluetoothAdapter = mBluetoothManager.getAdapter();
if (mBluetoothAdapter == null) {
Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
}
if (mBluetoothAdapter == null || mBleDeviceAddr == null) {
Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
}
final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(mBleDeviceAddr);
if (device == null) {
Log.w(TAG, "Device not found. Unable to connect.");
}
// We want to directly connect to the device, so we are setting the autoConnect
// parameter to false.
mBluetoothGatt = device.connectGatt(mContext, false, mGattCallback);
Log.d(TAG, "Trying to create a new connection.");
mBluetoothDeviceAddress = mBleDeviceAddr;
mConnectionState = STATE_CONNECTING;
}
/**
@@ -87,6 +152,18 @@ public class SdDataSourceBLE extends SdDataSource {
public void stop() {
Log.i(TAG, "stop()");
mUtil.writeToSysLogFile("SDDataSourceBLE.stop()");
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.disconnect();
if (mBluetoothGatt == null) {
return;
}
mBluetoothGatt.close();
mBluetoothGatt = null;
super.stop();
}
@@ -94,18 +171,153 @@ public class SdDataSourceBLE extends SdDataSource {
// Implements callback methods for GATT events that the app cares about. For example,
// connection change and services discovered.
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
String intentAction;
if (newState == BluetoothProfile.STATE_CONNECTED) {
intentAction = ACTION_GATT_CONNECTED;
mConnectionState = STATE_CONNECTED;
broadcastUpdate(intentAction);
Log.i(TAG, "Connected to GATT server.");
// Attempts to discover services after successful connection.
Log.i(TAG, "Attempting to start service discovery:" +
mBluetoothGatt.discoverServices());
public class SdDataBroadcastReceiver extends BroadcastReceiver {
//private String TAG = "SdDataBroadcastReceiver";
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
intentAction = ACTION_GATT_DISCONNECTED;
mConnectionState = STATE_DISCONNECTED;
Log.i(TAG, "Disconnected from GATT server.");
broadcastUpdate(intentAction);
}
}
@Override
public void onReceive(Context context, Intent intent) {
Log.v(TAG,"SdDataBroadcastReceiver.onReceive()");
String jsonStr = intent.getStringExtra("data");
Log.v(TAG,"SdDataBroadcastReceiver.onReceive() - data="+jsonStr);
updateFromJSON(jsonStr);
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.v(TAG,"Services discovered");
List<BluetoothGattService> serviceList = mBluetoothGatt.getServices();
for (int i=0; i<serviceList.size(); i++) {
String uuidStr = serviceList.get(i).getUuid().toString();
Log.v(TAG,"Service "+ uuidStr);
if (!GattAttributes.lookup(uuidStr,"None").equals( "None")) {
Log.v(TAG,"Service Name="+GattAttributes.lookup(uuidStr,"None"));
}
}
broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
} else {
Log.w(TAG, "onServicesDiscovered received: " + status);
}
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic,
int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
};
private void broadcastUpdate(final String action) {
final Intent intent = new Intent(action);
mContext.sendBroadcast(intent);
}
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:
// http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
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());
}
}
mContext.sendBroadcast(intent);
}
/**
* Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
* asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
* callback.
*
* @param characteristic The characteristic to read from.
*/
public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.readCharacteristic(characteristic);
}
/**
* Enables or disables notification on a give characteristic.
*
* @param characteristic Characteristic to act on.
* @param enabled If true, enable notification. False otherwise.
*/
public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
boolean enabled) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
// This is specific to Heart Rate Measurement.
if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
UUID.fromString(GattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
mBluetoothGatt.writeDescriptor(descriptor);
}
}
/**
* Retrieves a list of supported GATT services on the connected device. This should be
* invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
*
* @return A {@code List} of supported services.
*/
public List<BluetoothGattService> getSupportedGattServices() {
if (mBluetoothGatt == null) return null;
return mBluetoothGatt.getServices();
}
}
@@ -113,3 +325,7 @@ public class SdDataSourceBLE extends SdDataSource {