2023-12-19 00:21:12 +01:00

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obj	wiki	website
concept	https://en.wikipedia.org/wiki/MQTT	https://mqtt.org/

MQTT

MQTT is an OASIS standard messaging protocol for the Internet of Things (IoT). It is designed as an extremely lightweight publish/subscribe messaging transport that is ideal for connecting remote devices with a small code footprint and minimal network bandwidth. MQTT today is used in a wide variety of industries, such as automotive, manufacturing, telecommunications, oil and gas, etc.

Concepts

1. Publisher-Subscriber Model:

MQTT follows a publish-subscribe communication model, where clients (publishers) send messages to topics, and other clients (subscribers) receive messages from those topics.

2. Broker:

The MQTT broker is a server that receives published messages from clients and delivers them to the appropriate subscribers.

3. Topics:

Topics act as channels or categories to which messages are published. Subscribers express interest in specific topics to receive relevant messages.

MQTT Components

1. Publisher:

A client that sends messages to a specific topic.

2. Subscriber:

A client that expresses interest in a specific topic and receives messages published to that topic.

3. Broker:

The server that handles message routing between publishers and subscribers.

Topics and Subscriptions

Each message is inside a topic allowing for organizing them.

1. Topics:

Hierarchical and structured, topics enable flexible message routing.

2. Wildcards:

MQTT supports wildcards (+ and #) for subscribing to multiple topics.

Real-world Use Case

1. IoT (Internet of Things):

MQTT is widely used in IoT scenarios for efficient communication between devices.

2. Home Automation:

Smart homes leverage MQTT for controlling and monitoring devices. For example zigbee2mqtt with Home Assistant.

3. Messaging in Remote Locations:

Suitable for scenarios with low bandwidth, high latency, or unreliable connections.

Docker Compose

To use MQTT with mosquitto as a broker:

version: "3"
  mqtt:
    image: eclipse-mosquitto:2.0
    restart: unless-stopped
    volumes:
      - "./mosquitto:/mosquitto"
    ports:
      - "1883:1883"

2.3 KiB Raw Blame History