in content/lib/paho-mqtt.js [707:717]
var doPing = function() {
if (!this.isReset) {
this._client._trace("Pinger.doPing", "Timed out");
this._client._disconnected( ERROR.PING_TIMEOUT.code , format(ERROR.PING_TIMEOUT));
} else {
this.isReset = false;
this._client._trace("Pinger.doPing", "send PINGREQ");
this._client.socket.send(pingReq);
this.timeout = this._window.setTimeout(doTimeout(this), this._keepAliveInterval);
}
};