====== onWrtcCmd() ======
wrtc.onWrtcCmd() is an event function called when user command has been received through [[ixnx:wrtc:rtcgate:start|RTCgate]] signaling channel.

You can use this event to take care of the incoming user command.

===== Arguments =====
wrtc.onWrtcCmd(obj, msg)
  * obj - object: either a call object (indicating sender used [[ixnx:wrtc:js:api:call:adv.sendwrtccmd|call.adv.sendWrtcCmd()]] to send) or the wrtc object (indicating sender used [[ixnx:wrtc:js:api:wrtc:adv.sendwrtccmd|wrtc.adv.sendWrtcCmd()]] to send)
  * msg - the wrtc message received through the data channel:
    * msg.from - addressName of sender
    * msg.cmd - the user command (string or JSON)

===== Return value =====
Ignored.

===== Example =====
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"}:
<code>
  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"});
  }
</code>

===== See also =====
[[ixnx:wrtc:js:api:wrtc:adv.sendwrtccmd|wrtc.adv.sendWrtcCmd()]]

[[ixnx:wrtc:js:api:call:adv.sendwrtccmd|call.adv.sendWrtcCmd()]]