[libnice] How to get socket in relay mode?

[Alex Netes]

I'm trying to implement PMTU Discovery over libnice.
In order to do so, I want to retrieve the selected socket,
change IP_MTU_DISCOVER socket_opt, run the PMTU test
and return IP_MTU_DISCOVER socket_opt to default.

My problem is that nice_agent_get_selected_socket() doesn't work for relay
mode.
Any thoughts, how else can I retrieve the socket in case of relay mode?
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