Send mavlink message though cfbridge to PX4

I need to send Mavlink messages through crazyradio to PX4 running on crazyflie.
What I am doing doesn’t seem to work:

socket = new DatagramSocket(14550);
socket.setBroadcast(true);
socket.setReuseAddress(true);
DatagramPacket p = new DatagramPacket(sendData, sendData.length, , 14555);
socket.send(p);

Am I right about sending message to port 14555?
cfbridge is running the default configuration: udp://:14555@:14550

Thanks so much!