public void listenToCaliperMeasurements(final BluetoothGattCharacteristic characteristic) {
if (characteristic == null) {
Log.e(
TAG,
"Haven't discovered this feature yet, please wait until it has connected once, and or try disconnecting and reconnecting.");
return;
}
Log.d(TAG, "Starting to listen to notifications from " + characteristic.getUuid());
final int charaProp = characteristic.getProperties();
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
// If there is an active notification on a characteristic, clear
// it first so it doesn't update the data field on the user interface.
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
mBluetoothLeService.readCharacteristic(characteristic);
}
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
mNotifyCharacteristic = characteristic;
mBluetoothLeService.setCharacteristicNotification(characteristic, true);
// Set descriptor to enable notifications
BluetoothGattDescriptor descriptor =
characteristic.getDescriptor(
UUID.fromString(SCalEvoBluetoothSpecifications.CLIENT_CHARACTERISTIC_CONFIG));
if (descriptor == null) {
Log.e(
TAG,
"descriptor "
+ SCalEvoBluetoothSpecifications.CLIENT_CHARACTERISTIC_CONFIG
+ "was null, looking for others.");
List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors();
String uuid;
for (BluetoothGattDescriptor aDescriptor : descriptors) {
uuid = aDescriptor.getUuid().toString();
Log.e(TAG, "BluetoothGattDescriptor " + uuid);
descriptor = aDescriptor;
}
if (descriptor == null) {
Log.e(
TAG,
"Couldn't find any descriptors for this characteristic, cant enable notifications");
return;
} else {
Log.e(TAG, "Trying the last descriptor to enable notifications");
}
}
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
mBluetoothLeService.writeDescriptor(descriptor);
Toast.makeText(this, "Ready", Toast.LENGTH_SHORT).show();
Log.e(TAG, "Ready to read from characteristic " + characteristic.getUuid());
}
}
