WebRTC with data channel only?

[Bill G]

Hello,

I'm trying to get a webrtcbin running which has data channels only (i.e. no audio, no video.)  I started with the working sendrecv example and got to the point where I had a working data-channel with audio only.  When I remove audio the data channels fail to connect - one data channel is created by GStreamer code, another intiated on the browser side.

I found and example (link below) for only receiving streams in which the gst_parse_launch() was removed and one-way transceivers manually added.  I read that without a audio/video sink pad connected the transceivers need to be manually created.  Maybe this is also related to data channels not functioning?

https://github.com/centricular/gstwebrtc-demos/compare/master...a-morales:figure-out-transceivers?expand=1

So, I'm assuming there is something preventing these data-channels from getting established, and asking how to get past it?  This is with everything running on one machine, Windows and GStreamer 1.16.  Thanks in advance!
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