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[webrtc-pc] Specify when a data channel's ID is assigned, and what the `id` attribute returns when no ID is assigned.

From: Taylor Brandstetter via GitHub <sysbot+gh@w3.org>
Date: Sat, 17 Sep 2016 00:11:44 +0000
To: public-webrtc@w3.org
Message-ID: <issues.opened-177543842-1474071103-sysbot+gh@w3.org>
taylor-b has just created a new issue for 
https://github.com/w3c/webrtc-pc:

== Specify when a data channel's ID is assigned, and what the `id` 
attribute returns when no ID is assigned. ==
This is an issue I noticed when working on a solution for issue #746.

The [WebRTC data channel establishment 
spec](https://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-08#section-6)
 requires that DTLS clients choose odd stream IDs, and DTLS servers 
choose even IDs.

However, the DTLS role may not be known at the time of creating a data
 channel. So, until the role is determined, what does the `id` 
attribute return? It's worth noting that both Chrome and Firefox 
currently return an ID of 65535, which is guaranteed to be out of 
range (the maximum usable ID is 65534). But it seems more "correct" to
 make the attribute nullable.

And then, when should a user script expect the ID to be populated? 
When the stable signaling state is reached with an SCTP media 
description negotiated? That would seem reasonable to me.

Please view or discuss this issue at 
https://github.com/w3c/webrtc-pc/issues/795 using your GitHub account
Received on Saturday, 17 September 2016 00:12:48 UTC

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