Menu
I try to get a MQTT JavaScript Client running. It's based on the Eclipse Paho Client Library (org.eclipse.paho.mqtt.javascript.git).
Before running the JavaScript Client I was performing some tests with
and
which are working fine.
Then I called my own mqttTest.html which contains:
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/JavaScript" src="mqttws31.js"></script>
<script type="text/JavaScript">
var client;
function doConnect() {
client = new Messaging.Client("test.mosquitto.org", 1883, "mosqOtti");
console.log("Client instantiated.");
client.startTrace();
console.log("Now trying to connect...");
client.connect({onSuccess:onConnect});
}
function onConnect() {
console.log("connection established");
doSubscribe();
}
function doSubscribe() {
client.subscribe("/topic1");
}
window.onload = function() {
this.doConnect();
}
</script>
</head>
.
.
.
</body>
</html>
I tried to lauch this in Firefox. The debug console output tells me that
[09:58:27.825] Firefox can't establish a connection to the server at ws://test.mosquitto.org:1883/mqtt. @ file:///mqttws31.js:914
I know that moquitto does not support websockets natively. But I red that the lighttp running on test.mosquitto.org has mod_websockets installed.
Line 914 of mqttws31.js is trying to do this.socket = new WebSocket(wsurl, 'mqttv3.1');
So it seems that
I stuggled around for a long time now and need to get a JavaScript MQTT Client running.
Does anyone have an idea? Or another approach? Socket.IO seems not to be the right solution too.
Thanks very much in advance!
414
As @hardillb says, the port you are using is incorrect. 1883 on test.mosquitto.org is solely for mqtt. If you wish to use websockets you need to connect using port 80. You should just be able to change your url to ws://test.mosquitto.org:1883/mqtt which presumably means changing your code to
client = new Messaging.Client("test.mosquitto.org", 80, "mosqOtti");
There is a websockets example (based on this code) running at http://test.mosquitto.org/sys/. Although it uses the deprecated mosquitto javascript client, it should demonstrate that it works.
The lighttpd config on test.mosquitto.org is:
websocket.server = (
"/mqtt" =>
(
"host" => "127.0.0.1",
"port" => "1883",
"subproto" => "mqttv3.1",
"type" => "bin"
)
)
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
