Does aioice support ice-lite?

[duhoobo]

RFC 5245 is supported according to README, I thought ICE lite implementation was supported as well.

I write a demo running behind a NAT, trying to make a connection with WebRTC gateway which employs ICE lite implemetation.

The demo won't take a role as "controlling agent" while gateway as initiator (OFFERing sdp). This behavior seems not compatible with RFC 5245.

RFC 5245, 2.7. Lite Implementations

When a lite implementation connects with a full implementation, the full agent takes the role of the controlling agent, and the lite agent takes on the controlled role.

[jlaine]

You are correct there isn't currently any specific code for ICE Lite, I need to read up on the subject.

For your specific use case, to be clear: the gateway (ice lite) is offering the SDP to aioice?

[ibc]

Some news here. My scenario is as follows:

• ICE-Lite server (mediasoup).
• Create a PC in aiortc that becomes the SDP offerer. In this case everything works without any change.
  • aiortc becomes ICE controlling and, hence, DTLS server.
  • mediasoup (the server) becomes ICE controlled (of course, it's ICE Lite) and DTLS client.
• Create a PC in aiortc that becomes the SDP answerer. In this case some tricks must be done for it to work:
  • aiortc does not understand ICE Lite so it insists in sending Binding requests with ICE_CONTROLLING flag.
  • The server rejects it with 487 "Role Conflict" (this is a recent addition).
  • Good news! aiortc changes its ICE role and becomes ICE controlling.
  • And ICE connects!
  • Then it's time for DTLS. After inspection, since aiortc started as ICE controlled it assumed that it should be DTLS server, and it remains being DTLS server after switching to ICE controlling.
  • Taking that into account I have ICE + DTLS working.

[jlaine]

OK, if I understand correctly there is no issue with aioice after all: it's an ICE full agent, and behaving correctly right? If so let's move the conversation back to aiortc.

[ibc]

Let's say it works because we figured out the DTLS role that aiortc assumes regardless it's SDP offerer or SDP answered :)

[jlaine]

OK I think this issue can be closed: aioice should now interop correctly with an ICE Lite peer. The only issue I found was that we always used agressive nomination. If you set connection.remote_is_lite, aioice will now use regular nomination.