[sctp] `max-message-size` SDP attribute is ignored

[melekes]

Refs pion/webrtc#1396

Right now maximum message size is fixed to 65kB. We should respect max-message-size attribute from the remote's SDP.

[nathanbabcock]

Any clue how hard this would be for a newcomer to patch? If I just fork the repo, could I replace the hardcoded value with my own max message size, or will there likely be side effects that make it more complicated than that?

[melekes]

Any clue how hard this would be for a newcomer to patch? If I just fork the repo, could I replace the hardcoded value with my own max message size, or will there likely be side effects that make it more complicated than that?

Sure, you can fork the repo and replace the const.

[nathanbabcock]

Tight. Ty @melekes.