Sub SendAndReceive(bb() as Byte)
        Dim dev As TcpClient
        dev.Connect(ip, port)

        Dim ns As NetworkStream = dev.GetStream()
        Dim readb As Integer = 0
        
        ns.Write(bb, 0, bb.Length - 1)

        Dim r(11) As Byte
        If ns.CanRead Then
            Do While ns.DataAvailable
                readb = ns.Read(r, 0, r.Length - 1)
            Loop
        End If
end Sub

int numberOfBytesRead = networkStream.Read(readBuffer, 0, readBuffer.Length);

private SocketChannel socketChannel;
private byte[] sendAndReceive(ByteBuffer bb) throws IOException, ECRException {

        //Match Endianness
        bb.flip();

        socketChannel.write(bb);

        System.out.println("Request sent!");

        ByteBuffer h = ByteBuffer.allocate(11);

        socketChannel.read(h);
        System.out.println("Response received");

        //Match Endianness
        h.flip();

        System.out.println("Protocol version :" + h.get() + "." + h.get());
        System.out.println("S/W version :" + h.get() + "." + h.get() + "." + h.get());

        //get the response code
        int responseCode = h.getShort() & 0xFFFF;


        System.out.println("Response code :" + responseCode + " -  " + ResponseCodes.get(responseCode));

        if (ResponseCodes.get(responseCode) != ResponseCodes.OK) {
            throw new AssertionError(responseCode);
        }

        //Match Endianness
        int len = h.getShort() & 0xFFFF;

        //skip 2 reserved bytes
        h.get();
        h.get();

        ByteBuffer response = ByteBuffer.allocate(len);

        socketChannel.read(response);

        return response.array();
    }