Datachannel issue

[Jason Shen]

have notice an issue with datachannel, when join into the room fresh, everything works as expected, if rejoin the room with the same user id (used userid as the datachannel name), the newly join peer won't be able to send out via datachannel, so i am thinking, is the datachannel is not been clean up properly when a peer leave. i will have a look at this as well, but if some know whats up with this would be great help

cheers

Jason