Bluetooth Connection failed “java.io.IOException: read failed, socket might closed or timeout, read ret: -1”

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In the constructor of BluetoothConnector.java, a list of uuidCandidates is passed.

public BluetoothConnector(BluetoothDevice device, boolean secure, BluetoothAdapter adapter,
                              List<UUID> uuidCandidates) 
          {
        this.device = device;
        this.secure = secure;
        this.adapter = adapter;
        this.uuidCandidates = uuidCandidates;

        if (this.uuidCandidates == null || this.uuidCandidates.isEmpty()) {
            this.uuidCandidates = new ArrayList<UUID>();
            this.uuidCandidates.add(UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66"));
        }
    }

Have you passed it null?

If yes,then try calling device.fetchUuidsWithSdp() for the Bluetooth device you want to connect and receive BluetoothDevice.ACTION_UUID intent in your receiver.As this will fetch a list of uuids supported for the device.

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