send and receive udp packets by a key

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Mobile

Android

UDP

WiFi

Hello,
We make UDP packets in android by this code:

byte[] sendData = new byte[1024];
sendData = ("namekey").getBytes();

DatagramPacket sendPacket = new DatagramPacket(	sendData, sendData.length, myBIp, PORT);

Now, I want send a key/value by that string.
How can I do it?
This code has error!

byte[] sendData = new byte[1024];
							
							Intent in=new Intent();
							in.putExtra("key", name);
							
							sendData=((String) in).getBytes();