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According to W3C specification (https://w3c.github.io/webrtc-pc/#datachannel-send) we should return InvalidStateError exception when trying to send when the channel is not open. In the world of C/glib/gstreamer we don't have exceptions but have to rely on gboolean/GError instead. Introducing these calls for a change in function signature of the action signals used to send data on the datachannel. Changing the signature of the existing "send-string" and "send-data" signals would mean an immediate breaking change so instead we deprecate them. Furthermore, there is no way to express GError** as an argument to an action signal in a way that fits language bindings (pointer-to-pointer simply does not work) and we have to use regular functions instead. Therefore we introduce gst_webrtc_data_channel_send_data_full() and gst_webrtc_data_channel_send_string_full() while deprecating the old functions and corresponding signals. Part-of: <https://gitlab.freed...
