This helper allows to start an UDP server listenig on a specific port and send UDP packets to a remote host.
Let’s start with an example. We want to add a server listening on port 7777.
First of all create a new helper and start the server specifying ip address, port number and a listener
UdpHelper udpserver = new UpdHelper();
udpServer.startServer("0.0.0.0", 7777, new UdpListener() {
@Override
public void onDataAvailable(String sourceAddress, Integer sourcePort, String data) {
System.out.println("UDP packet received: {0}", data);
// here add the code to execute when a packet is received
});
When a new packet arrives you can see the payload on the log as a string and execute any code added to onDataAvailable method.
It’d be better to stop the server and unbound the port with
udpServer.stop()
To send a packet you need only the ip and port number of the remote host and a string representing the payload.
For example:
udpServer.send("192.168.0.120", 8899, "payload to send");