Multicast Tester is used for testing Multicast packets on your network.

Features:
• Allows you to send and receive Multicast packets on any Multicast IP and Port combination.
• Allows custom messages to be sent.
• Shows IP Address origin of each received packet.
• Use of Material Design to give you a very simple interface.
• Receive in Hexadecimal to view the raw data sent over the network.

Troubleshooting:

I don't receive my program's packets / My programs aren't seeing what I send!

There are a couple possible reasons for this:

1. Your code may be the problem.
2. Your router's firewall may block Multicast packets.
3. Some devices inherently block all Multicast connections. In this case you may neither receive nor send packets. This is a device problem, not an app problem. It cannot be circumvented in any way, even with root. The only solution would be to install another ROM which does not block Multicast connections.

I cannot bind to a certain address or port.

Most likely, your phone is currently using that address & port combination, or you are not allowed to bind to that address & port combination. Typically you will see this error if you try to bind to a port less than 1024, as these ports are restricted for the operating system's use only. (This is the case on most operating systems, even on desktops). Try using a port larger than 1024 if you are not already, or try another IP address.

I'm seeing characters in Hexadecimal that shouldn't be there.

This is more than likely a bug in your code, not mine. However, my contact page is open if you are pretty sure that I am the one with the bug.