Error: Outbound packet larger than maximum message size 65535

[enobufs]

Your environment.

• Version: pion/webrtc@v2.2.24
• Browser: n/a

What did you do?

Try to send data channel message with length 64KB

What did you expect?

Successfully sent.

What happened?

Errored with:

 Outbound packet larger than maximum message size 65535

Here's where the error originates.

There are three problems:

1. By default it should allow 64KB
2. SCTPTransport has remoteMaxMessageSize, but this doesn't get propagated to pion/sctp
3. remoteMaxMessageSize should be updated based on max-message-size in SDP.

@Sean-Der do we parse max-message-size in SDP, and do we send it?

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@Sean-Der I have fixed the default value at pion/sctp@v1.7.10. (the number 1)

In the change, I also added:

• MaxMessageSize param to sctp.Config struct
• MaxMessageSize() to sctp.Association
• SetMaxMessageSize() to sctp.Association

So that we could accomplish 2 and 3 I mentioned earlier at pion/webrtc (SctpTransport).