EMQX

https://docs.emqx.com/en/emqx/latest
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EMQX is a high-performance, scalable, and distributed MQTT messaging platform designed for IoT...
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### Set Up Kafka Server on macOS

Source: https://docs.emqx.com/en/emqx/latest/data-integration/data-bridge-kafka.html

Install and run Kafka using provided commands. This example uses KRaft to start Kafka.

```bash
wget https://archive.apache.org/dist/kafka/3.3.1/kafka_2.13-3.3.1.tgz

tar -xzf  kafka_2.13-3.3.1.tgz

cd kafka_2.13-3.3.1

# Use KRaft start Kafka
KAFKA_CLUSTER_ID="$(bin/kafka-storage.sh random-uuid)"

bin/kafka-storage.sh format -t $KAFKA_CLUSTER_ID -c config/kraft/server.properties

bin/kafka-server-start.sh config/kraft/server.properties
```

--------------------------------

### Start Example with Docker Compose

Source: https://docs.emqx.com/en/emqx/latest/deploy/cluster/lb-haproxy.html

Use Docker Compose to start the EMQX cluster and HAProxy environment.

```bash
docker compose up -d
```

--------------------------------

### Start EMQX in Background with Installation Package

Source: https://docs.emqx.com/en/emqx/latest/getting-started/getting-started.html

Start EMQX in the background using the installation package. This method is not recommended for general use. Access the EMQX Dashboard at http://localhost:18083/.

```bash
./emqx/bin/emqx start
```

--------------------------------

### Install Plugin via API

Source: https://docs.emqx.com/en/emqx/latest/extensions/plugin-management.html

Instructions for installing, starting, stopping, and checking plugins using the EMQX API.

```APIDOC
## Install Plugin via API

### Description
Install a compiled plugin package and manage its lifecycle using the EMQX API.

### Steps
1. **Allow Installation:**
   ```bash
   emqx ctl plugins allow my_emqx_plugin-1.0.0
   ```
2. **Install Plugin:**
   ```bash
   curl -u $KEY:$SECRET -X POST http://$EMQX_HOST:18083/api/v5/plugins/install -H "Content-Type: multipart/form-data" -F "plugin=@my_emqx_plugin-1.0.0.tar.gz"
   ```
3. **Check Plugin List:**
   ```bash
   curl -u $KEY:$SECRET http://$EMQX_HOST:18083/api/v5/plugins | jq
   ```
4. **Start/Stop Plugin:**
   ```bash
   curl -s -u $KEY:$SECRET -X PUT "http://$EMQX_HOST:18083/api/v5/plugins/my_emqx_plugin-1.0.0/start"
   curl -s -u $KEY:$SECRET -X PUT "http://$EMQX_HOST:18083/api/v5/plugins/my_emqx_plugin-1.0.0/stop"
   ```
```

--------------------------------

### Run Kotlin MCP Server Example

Source: https://docs.emqx.com/en/emqx/latest/emqx-ai/sdks/mcp-sdk-kotlin.html

Starts the MCP server example using Gradle. Specify the MQTT client ID and MCP server name as arguments.

```bash
./gradlew run --args="--mqtt kt001 demo/kotlin-mcp-server"
```

--------------------------------

### Start EMQX in foreground

Source: https://docs.emqx.com/en/emqx/latest/deploy/install-debian.html

Start EMQX in the foreground after installing with a tar.gz archive. This is useful for development or debugging.

```bash
./emqx/bin/emqx foreground
```

--------------------------------

### Start EMQX using systemd

Source: https://docs.emqx.com/en/emqx/latest/deploy/install-debian.html

Use this command to start EMQX as a systemd service after installation with a deb package.

```bash
sudo systemctl start emqx
```

--------------------------------

### Example Node Evacuation Command

Source: https://docs.emqx.com/en/emqx/latest/deploy/cluster/rebalancing.html

This example demonstrates starting node evacuation, migrating clients from 'emqx@127.0.0.1' to 'emqx2@127.0.0.1' and 'emqx3@127.0.0.1'. It specifies custom rates for connection and session eviction, and a takeover wait time.

```bash
./bin/emqx ctl rebalance start --evacuation \
	--wait-health-check 60 \
	--wait-takeover 200 \
	--conn-evict-rate 30 \
	--sess-evict-rate 30 \
	--migrate-to "emqx2@127.0.0.1 emqx3@127.0.0.1"
Rebalance(evacuation) started
```

--------------------------------

### Clone Example Repository

Source: https://docs.emqx.com/en/emqx/latest/deploy/cluster/lb-haproxy.html

Clone the example repository to get the Docker Compose configuration for HAProxy and EMQX load balancing.

```bash
git clone https://github.com/emqx/emqx-usage-example
cd emqx-usage-example/mqtt-lb-haproxy
```

--------------------------------

### List All Gateways

Source: https://docs.emqx.com/en/emqx/latest/admin/cli.html

Lists all configured gateways along with their status, client count, and start time. The example shows a sample output with multiple gateways.

```bash
$ emqx ctl gateway list
Gateway(name=coap, status=running, clients=0, started_at=2023-05-22T14:23:50.353+08:00)
Gateway(name=exproto, status=unloaded)
Gateway(name=lwm2m, status=unloaded)
Gateway(name=mqttsn, status=unloaded)
Gateway(name=stomp, status=unloaded)
```

--------------------------------

### Install and Run PostgreSQL Docker Image

Source: https://docs.emqx.com/en/emqx/latest/data-integration/data-bridge-pgsql.html

Starts a PostgreSQL Docker container and sets a password. Accesses the container and connects to the PostgreSQL server to create a database.

```bash
# To start the PostgreSQL docker image and set the password as public
docker run --name PostgreSQL -p 5432:5432 -e POSTGRES_PASSWORD=public -d postgres

# Access the container
docker exec -it PostgreSQL bash

# Locate the PostgreSQL server in the container and input the preset password
psql -U postgres -W

# Create and then select the database

CREATE DATABASE emqx_data;

\c emqx_data;
```

--------------------------------

### Install and Run EMQX Enterprise with Docker

Source: https://docs.emqx.com/en/emqx/latest/getting-started/getting-started.html

Use this command to download and start the latest version of EMQX Enterprise. Ensure Docker is installed and running. Access the EMQX Dashboard at http://localhost:18083/.

```bash
docker run -d --name emqx -p 1883:1883 -p 8083:8083 -p 8084:8084 -p 8883:8883 -p 18083:18083 emqx/emqx-enterprise:latest
```

--------------------------------

### Install EMQX Helm Chart from GitHub

Source: https://docs.emqx.com/en/emqx/latest/deploy/kubernetes/chart.html

Install the EMQX Helm chart by cloning the repository and running the Helm install command.

```bash
git clone https://github.com/emqx/emqx.git
cd emqx/deploy/charts/emqx-enterprise
helm install my-emqx .
```

--------------------------------

### Subscribe to Topics with eMQTT-Bench

Source: https://docs.emqx.com/en/emqx/latest/performance/benchmark-emqtt-bench.html

Starts a specified number of clients to subscribe to a given topic. This example sets up 500 connections, each subscribing to the topic 't' with Qos0.

```bash
./emqtt_bench sub -t t -h emqx-server -c 500
```

--------------------------------

### Start EMQX with Environment Variable

Source: https://docs.emqx.com/en/emqx/latest/data-integration/data-bridge-kafka.html

Set environment variables for EMQX startup. Ensure variable names have the `EMQXVAR_` prefix. This example sets the Kafka topic name.

```bash
EMQXVAR_KAFKA_TOPIC=testtopic-in bin/emqx start
```

--------------------------------

### Install a Plugin with EMQX CLI

Source: https://docs.emqx.com/en/emqx/latest/admin/cli.html

Install a plugin package that is located in the plugin installation directory. Requires the plugin's name and version.

```bash
emqx ctl plugins install emqx_auth_mnesia-3.0.1
```

--------------------------------

### Install EMQX Helm Chart from Helm Repository

Source: https://docs.emqx.com/en/emqx/latest/deploy/kubernetes/chart.html

Install the EMQX Helm chart from the official Helm repository by adding the repo and running the install command.

```bash
helm repo add emqx https://repos.emqx.io/charts
helm install my-emqx emqx/emqx-enterprise
```

--------------------------------

### Start Gateway

Source: https://docs.emqx.com/en/emqx/latest/admin/cli.html

Starts a specified gateway. The example shows starting the 'coap' gateway.

```bash
$ emqx ctl gateway start coap
ok
```

--------------------------------

### Initialize Demo Project (Bash)

Source: https://docs.emqx.com/en/emqx/latest/emqx-ai/sdks/mcp-sdk-python.html

Creates a new project directory and navigates into it using uv for managing dependencies.

```bash
uv init mcp_over_mqtt_demo
cd mcp_over_mqtt_demo

```

--------------------------------

### Set Up emqx-ft Client Environment

Source: https://docs.emqx.com/en/emqx/latest/file-transfer/quick-start.html

Clone the `emqx-ft` repository, create a virtual environment, and install the necessary dependencies to use the file transfer command-line tool.

```bash
git clone https://github.com/emqx/emqx-ft.git
cd emqx-ft
python3 -m venv .venv
source .venv/bin/activate
pip install .
```

--------------------------------

### Install Node-RED via NPM

Source: https://docs.emqx.com/en/emqx/latest/connect-emqx/node-red.html

Installs Node-RED globally using npm. Ensure Node.js LTS is installed. After installation, run 'node-red' to start the editor.

```bash
npm install -g --unsafe-perm node-red
```

```bash
node-red
```

--------------------------------

### Verify Redis Installation

Source: https://docs.emqx.com/en/emqx/latest/data-integration/data-bridge-redis.html

Use the SET and GET commands to verify that Redis is installed and running correctly.

```bash
127.0.0.1:6379> set emqx "Hello World"
OK
127.0.0.1:6379> get emqx
"Hello World"
```

--------------------------------

### EMQX Configuration Paths Examples

Source: https://docs.emqx.com/en/emqx/latest/configuration/configuration.html

Examples of how to reference configuration values using dot-separated paths for different settings.

```bash
node.name = "emqx.127.0.0.1"
zone.zone1.max_packet_size = "10M"
authentication.1.enable = true
```

--------------------------------

### Example $SYS Topic Paths

Source: https://docs.emqx.com/en/emqx/latest/observability/mqtt-system-topics.html

These are example topic paths for retrieving EMQX version and uptime information from a specific node.

```bash
$SYS/brokers/emqx@127.0.0.1/version
$SYS/brokers/emqx@127.0.0.1/uptime
```

--------------------------------

### Install Datalayers using Docker

Source: https://docs.emqx.com/en/emqx/latest/data-integration/data-bridge-datalayers.html

Use this command to install and start Datalayers using Docker. Refer to the official Datalayers documentation for detailed installation steps.

```bash
docker run -d --name datalayers -p 8080:8080 -p 9092:9092 -p 5432:5432 -p 8081:8081 -p 8082:8082 -p 8083:8083 -p 8084:8084 -p 8085:8085 -p 8086:8086 -p 8087:8087 -p 8088:8088 -p 8089:8089 -p 8090:8090 -p 8091:8091 -p 8092:8092 -p 8093:8093 -p 8094:8094 -p 8095:8095 -p 8096:8096 -p 8097:8097 -p 8098:8098 -p 8099:8099 -p 9100:9100 -p 9101:9101 -p 9102:9102 -p 9103:9103 -p 9104:9104 -p 9105:9105 -p 9106:9106 -p 9107:9107 -p 9108:9108 -p 9109:9109 -p 9110:9110 -p 9111:9111 -p 9112:9112 -p 9113:9113 -p 9114:9114 -p 9115:9115 -p 9116:9116 -p 9117:9117 -p 9118:9118 -p 9119:9119 -p 9120:9120 -p 9121:9121 -p 9122:9122 -p 9123:9123 -p 9124:9124 -p 9125:9125 -p 9126:9126 -p 9127:9127 -p 9128:9128 -p 9129:9129 -p 9130:9130 -p 9131:9131 -p 9132:9132 -p 9133:9133 -p 9134:9134 -p 9135:9135 -p 9136:9136 -p 9137:9137 -p 9138:9138 -p 9139:9139 -p 9140:9140 -p 9141:9141 -p 9142:9142 -p 9143:9143 -p 9144:9144 -p 9145:9145 -p 9146:9146 -p 9147:9147 -p 9148:9148 -p 9149:9149 -p 9150:9150 -p 9151:9151 -p 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9999:9999 -p 10000:10000 datalayers/datalayers:latest
```

--------------------------------

### Initialize MCP Server with Tools and Resources (Python)

Source: https://docs.emqx.com/en/emqx/latest/emqx-ai/sdks/mcp-sdk-python.html

Sets up a FastMCP server, exposing an addition tool and a dynamic greeting resource. Configure MQTT broker details and logging level.

```python
# demo_mcp_server.py
from mcp.server.fastmcp import FastMCP

# Create an MCP server
mcp = FastMCP(
    "demo_mcp_server/calculator",
    log_level="DEBUG",
    mqtt_server_description="A simple FastMCP server that exposes a calculator tool",
    mqtt_options={
        "host": "broker.emqx.io",
    },
)

# Add an addition tool
@mcp.tool()
def add(a: int, b: int) -> int:
    """Add two numbers"""
    return a + b

# Add a dynamic greeting resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    """Get a personalized greeting"""
    return f"Hello, {name}!"

```

--------------------------------

### Start EMQX in Daemon Mode

Source: https://docs.emqx.com/en/emqx/latest/deploy/install-macOS.html

Use this command to start EMQX in the background. Ensure you are in the EMQX installation directory.

```bash
./bin/emqx start
```

--------------------------------

### Start a Plugin with EMQX CLI

Source: https://docs.emqx.com/en/emqx/latest/admin/cli.html

Start a specified plugin. Requires the plugin's name and version.

```bash
emqx ctl plugins start emqx_auth_mnesia-3.0.1
```

--------------------------------

### Stop EMQX with Installation Package

Source: https://docs.emqx.com/en/emqx/latest/getting-started/getting-started.html

Use this command to stop a running EMQX instance that was started with an installation package.

```bash
./emqx/bin/emqx stop
```
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