UDP block for simulink

Hi,

I am trying to use judp.m as a reference for building a simple udp receive block for simulink.

In simulink I am using matlab function block with the code below:

I am not very familiar with coder and would be thankful if I can get assistance in getting this block fixed.

Thanks

function mssg  = judp(targetPort)
timeout = 5000;
packetLength = 10;
coder.extrinsic('java.io.*')
coder.extrinsic('java.net.InetAddress')
coder.extrinsic('java.net.DatagramSocket')
coder.extrinsic('java.net.DatagramPacket')
    socket = java.net.DatagramSocket(targetPort)
    socket.setSoTimeout(timeout)
    socket.setReuseAddress(1);
    packet = java.net.DatagramPacket(zeros(1,packetLength,'int8'),packetLength);
    socket.receive(packet);
    socket.close;
    mssg = packet.getData;
    mssg = mssg(1:packet.getLength);
    inetAddress = packet.getAddress;
    sourceHost = char(java.net.InetAddress.inetAddress.getHostAddress);


end