OptionaldataThe actual message of the signal.
OptionaltoThe participants to whom to send the signal. They will only receive it if they are subscribed to
event Session.on('signal'). If empty or undefined, the signal will be send to all participants.
OptionaltypeThe type of the signal. Participants subscribed to event Session.on('signal:type') will
receive it. Participants subscribed to Session.on('signal') will receive all signals.
See Session.signal