[erlang-questions] Erlang/OTP diameter relay doesn't work

[Asier Gutierrez Rubio]

Hi there,


We are trying to build a simple diameter relay agent for our company which will connect diameter clients to a number of different billing diameter servers. Right now we are just testing the system with one client and one server.


Unfortunately, we are unable to get even the relay example from ericsson repository working.


https://github.com/erlang/otp/tree/master/lib/diameter/examples/code


We modified slightly the example to connect to our diameter server on a remote address and listen to the local port TCP/3868. The relay agent connects successfully to our diameter server, performing a full CER/CEA exchange and subsequent DWR/DWA. Our client successfully connects to the relay agent through CER/CEA, but when the client sends a Credit Control Request (AVP Request-Type:4, Requested_Action: 2, Command-Code: 272), we get 3001 DIAMETER_COMMAND_UNSUPPORTED consistently, every single time. Peer_up callback is called, but no handle_request or pick_peer callback is called. When we try to use the same client with the server directly, everything works fine and we get 2001 SUCCESS.


We are sure we are missing something, maybe a parameter in the transport options, a callback that we need to implement or something like that.


Could you give us a hint?


Thanks in advance,

Asier

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