| Mosquitto broker using Websockets on Raspberry Pi [message #1855446] |
Fri, 14 October 2022 12:40 |
 john cohn
Messages: 1
Registered: October 2022 |
Junior Member |
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TL;DR
Any ideas why websockets might not be working correctly for a Mosquitto broker working on a raspberry pi ?
Longer story:
I'm trying to install my own Mosquitto broker on a rasp 4 running Raspbian GNU/Linux 11 (bullseye) following these instructions
Installing the Mosquitto MQTT Server to the Raspberry Pi - Pi My Life Up 1)
I'm able to run my broker fine using port 1883 following the examples in the tutorial link above. I am not however able to get things working on websockets. I'm using websockets because i'm trying to link an MQTT app on the Pi to a GUI built using P5.js which runs on a browser. I need this all to be local since the device will not always be attached to the internet.
I have the following in my mosquitto.conf
Place your local configuration in /etc/mosquitto/conf.d/
A full description of the configuration file is at
/usr/share/doc/mosquitto/examples/mosquitto.conf.example
pid_file /run/mosquitto/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
listener 9001
protocol websockets
I am starting mosquitto this way for test
sudo mosquitto -c mosquitto.conf
(I use sudo because otherwise it says ints not able to write the pid file)
I see the following in my /var/log/mosquitto/mosquitto.log
1665660690: mosquitto version 2.0.11 starting
1665660690: Config loaded from mosquitto.conf.
1665660690: Opening websockets listen socket on port 9001.
I then load my P5.js script on a browser on a. device thats on the same wifi network as my Rasberry pi.
This P5.js code uses **mqttws31.min.js ** to open an MQTT session over websockets. Here's a fragment.
// MQTT client details:
let broker = {
hostname: "test.mosquitto.org",
port: 8081,
};
// MQTT client:
let client;
// client credentials:
let creds = {
clientID: "p5Clientxyz", // choose whatever name you want
userName: "public", // unique Key from token
password: "public", // unique Secret from token
};
// topic to subscribe to when you connect:
let topic = "jcp5js/sendLift";
// ==== stuff omitted
function setup() {
createCanvas(800, 800);
// ==== stuff omitted
// Create an MQTT client:
client = new Paho.MQTT.Client(
broker.hostname,
Number(broker.port),
creds.clientID
);
// set callback handlers for the client:
client.onConnectionLost = onConnectionLost;
client.onMessageArrived = onMessageArrived;
// connect to the MQTT broker:
client.connect({
onSuccess: onConnect, // callback function for when you connect
userName: creds.userName, // username
password: creds.password, // password
useSSL: true, // use SSL
});
// called when the client connects
function onConnect() {
client.subscribe(topic);
console.log("connected");
}
// ==== stuff omitted -- rest of functional code
When I point it at test.mosquitto.org and port 8081 ... it connects just fine
When I point it at 192.168.10.241 and port 9001 (the ip address of my pi)
the Javascript console says something like
Cannot connect to "192.168.10.241:9001"
Note: I apologize I dont have the exact message . I can post that this evening when I can get in the same wifi network
PHEW... sorry for the long explainaition>> Again Any ideas why websockets might not be working correctly on a raspberry pi ?
Any help appreciated !
-jc
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