No webrtcbin data channel on 1.20.1?

[Florian Echtler]

Hi everyone,

I've been testing my GStreamer webrtc application with 1.16.2 and more recently 
with 1.20.1. Here's a code snippet of the datachannel setup:

         self.wrb = self.bin.get_by_name("webrtcbin")
         self.wrb.connect("on-data-channel",self.on_data_channel)

         # create the data channel
         self.wrb.emit("create-data-channel", "events", None)

     # message on WebRTC data channel
     def on_dc_message(self, wrb, message):
         logging.debug("New data channel message: "+message)

     # new data channel created
     def on_data_channel(self, wrb, data_channel):
         logging.info("New data channel created.")
         self.datachannel = data_channel
         self.datachannel.connect("on-message-string", self.on_dc_message)
         self.datachannel.connect("on-message-data",   self.on_dc_message)
         hello = "Hi from "+self.name
         self.datachannel.emit("send-data",GLib.Bytes.new(hello.encode("utf-8")))
         self.datachannel.emit("send-string",hello)

However, on 1.20.1, I'm never getting the on-data-channel signal, while it seems 
to work on 1.16.2. What should I change, is this a timing issue? This also had 
me wondering what the second parameter to create-data-channel is supposed to be, 
couldn't find any documentation?

Thanks and best, Florian
-- 
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