MQTT

MQTT Version 3.1.1 Protocol

Previous OASIS Standard version of MQTT, still widely deployed across IoT brokers, devices, and cloud platforms. MQTT 3.1.1 defines the publish/subscribe messaging semantics, QoS levels 0/1/2, retained messages, and last-will-and-testament that are inherited and extended by MQTT 5.0.

GitHub

Other Resources

🔗
Specification
https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html
🔗
Specification PDF
https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.pdf

API entry from apis.yml

apis.yml Raw ↑ 
aid: mqtt:protocol-v3-1-1
name: MQTT Version 3.1.1 Protocol
description: Previous OASIS Standard version of MQTT, still widely deployed across IoT brokers, devices,
  and cloud platforms. MQTT 3.1.1 defines the publish/subscribe messaging semantics, QoS levels 0/1/2,
  retained messages, and last-will-and-testament that are inherited and extended by MQTT 5.0.
humanURL: https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html
baseURL: mqtt://broker.example.com:1883
tags:
- MQTT 3.1.1
- Protocol
- Publish Subscribe
- OASIS
- IoT
properties:
- type: Specification
  url: https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html
- type: Specification PDF
  url: https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.pdf