MQTT in Javascript.

Follow the below code to implement MQTT using Javascript.

<script src=”https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.1/mqttws31.min.js" type=”text/javascript”></script>
<script type=”text/javascript” language=”javascript”>
client = new Paho.MQTT.Client(“192.168.103.141”, 9001, “/ws”, “webdqweqe”);
client.onConnectionLost = onConnectionLost;
client.onMessageArrived = onMessageArrived;
var myVar;
// connect the client
client.connect({ onSuccess: onConnect, onFailure: onFailure });
function onFailure(e) {
console.log(e);
}
function onConnect() {
clearInterval(myVar);
console.log(“onConnect”);
client.subscribe(“rfidNo”);
}
// called when the client loses its connection
function onConnectionLost(responseObject) {
if (responseObject.errorCode !== 0) {
console.log(“onConnectionLost:” + responseObject.errorMessage);
}
myVar = setInterval(function () { sendTimer() }, 5000);
}
function sendTimer() {
client.connect({ onSuccess: onConnect });
}
// called when a message arrives
function onMessageArrived(message) {
console.log(“onMessageArrived:” + message.payloadString);
}
</script>