wrtc.onWrtcCmd() is an event function called when user command has been received through RTCgate signaling channel.
You can use this event to take care of the incoming user command.
wrtc.onWrtcCmd(obj, msg)
Ignored.
If sending client has sent {cmd: "ping"} using
call.adv.sendWrtcCmd({cmd: "ping"});
you will receive a wrtc.onWrtcCmd() call with {cmd: "ping"} in its msg.cmd argument. Then you can respond with {cmd: "pong"}:
wrtc.onWrtcCmd= function(obj, msg) {
if ((msg.cmd.cmd) && (msg.cmd.cmd == "ping"))
if (obj.objType == "call")
obj.adv.sendWrtcCmd({cmd: "pong"});
else
wrtc.adv.sendWrtcCmd(msg.from, {cmd: "pong"});
}