If the peer is already in a session and tries to start a new one, give them a helpful error. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2460>
If the peer is already in a session and tries to start a new one, give them a helpful error. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2460>