MQTT Server · Under1Tree · Smart Jar IoT Platform

⚡

Welcome to Under1Tree MQTT Platform

This server hosts both Mosquitto and EMQX MQTT brokers, providing reliable messaging for Smart Jar IoT devices. Choose between lightweight Mosquitto for constrained devices ( testing / debugging ) or feature-rich EMQX for advanced scenarios like spectral analysis, AI detection and Image Processing.

You can find more information about the brokers from their websites.

Smart Jar IoT Mosquitto Broker EMQX Enterprise MQTT 3.1.1 & 5.0 WebSocket Support TLS Encryption

🔌

Quick Connection Guide

Server Hostname

mqtt.under1tree.com

EMQX - Plain MQTT

1883 (TCP)

EMQX - Secure MQTT

8883 (TLS)

EMQX - WebSocket

8083 (WS)

EMQX - Secure WebSocket

8084 (WSS)

Mosquitto - Plain MQTT

9883 (TCP)

Mosquitto - Secure MQTT

9884 (TLS)

Mosquitto - Secure WebSocket

9001 (WSS)

Note: Authentication required for all connections. Use provided credentials for device access.

💡

MQTT Usage Examples

Common Topics

smartjar/<device-id>/status

smartjar/<device-id>/telemetry

smartjar/<device-id>/command

smartjar/<device-id>/config

Device ID Pattern

# Smart Jar device naming

sj-<location>-<type>-<id>

# Example: sj-kitchen-counter-01

Command Line Examples

# Publish telemetry data

mosquitto_pub -h mqtt.under1tree.com -p 9883 -u device-user -P password \

     -t "smartjar/sj-kitchen-01/telemetry" -m '{"level":78,"temp":24.1,"humidity":45}'

# Subscribe to all telemetry

mosquitto_sub -h mqtt.under1tree.com -p 9883 -u device-user -P password \

     -t "smartjar/+/telemetry" -v

# Publish command

mosquitto_pub -h mqtt.under1tree.com -p 9883 -u device-user -P password \

     -t "smartjar/sj-kitchen-01/command" -m '{"cmd":"calibrate","value":100}'

JavaScript WebSocket Example

// Connect using Paho MQTT over WebSocket

const client = new Paho.MQTT.Client(

     "mqtt.under1tree.com",

      9001,

      "web-client-" + Math.random()
);

client.connect({

    userName: "web-user",

    password: "password",

    useSSL: true,

    onSuccess: () => {

        client.subscribe("smartjar/+/telemetry");

        console.log("Connected to MQTT broker");

    }

});