O Janus MQTT Proxy é um serviço que escrevi no Go como um projeto de hobby. Ele se conecta ao broker MQTT e assina todos os eventos, e os clientes, por sua vez, se conectam ao proxy e se comunicam com ele como com um broker MQTT.

Ele permite que você:

• restringir o acesso do cliente a vários tópicos. Incluindo restringir separadamente o acesso de leitura e gravação;
• Substitua nomes de tópicos e conteúdo do evento por regexp s.

Por que isso é necessário?

MQTT . , - 1 /my/lamp/on, - On /my/lamp. , , . , .

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broker_to_client: #       

  #    MQTT discovery.
  - topic: ^/devices/wb-gpio/controls/LIGHT_([^/]*)/meta/type$
    template: /homeassistant/light/{{.f1}}/config
    val_map:
      switch: >-
        {
        "command_topic":"/light/{{.f1}}/state",
        "state_topic":"/light/{{.f1}}/state",
        "name":"{{.f1}}"
        }

  - topic: ^/devices/wb-gpio/controls/LIGHT_([^/]*)$
    template: /light/{{.f1}}/state
    val_map: {0: OFF, 1: ON}

client_to_broker: #       

  - topic: ^/light/([^/]*)/state$
    template: /devices/wb-gpio/controls/LIGHT_{{.f1}}/on
    val_map: {OFF: 0, ON: 1}

, . .

, Home Assistant , .

MQTT discovery : Wiren Board , . , . switch. retained — . JSON-, , MQTT discovery .

Janus MQTT

Go paho.mqtt.golang. MQTT- . , , MQTT-.

: , , . . .. MITM.

:

• QoS — 2 1 , ;
• - QoS message_id, uint16 ;
• Janus MQTT . , ;
• , in-memory retained-.

MQTT- client.serveIncoming, TCP-. MQTT- :

• ConnectPacket — Connack ;
• SubscribePacket — Suback retained-;
• UnsubscribePacket — Unsuback ;
• PingreqPacket — Pingresp;
• PublishPacket — ;
• PubackPacket, PubrelPacket, PubcompPacket ;
• DisconnectPacket — .

QoS. MQTT QoS:

• QoS 0: ;
• QoS 1: ;
• QoS 2: .

, 1 2 , , , ( 2 , QoS 1, ).

publish- QOS=2

publish- QOS=2

Janus MQTT :

• Wiren Board — ;
• Home Assistant — ( );
• Yandex2mqtt — .

Wiren Board

. . MQTT-.

Yandex2mqtt

oAuth API . . munrexio, bawdiest , .

, :

$ mosquitto_sub -h localhost -u yandex2mqtt -P yandex2mqtt -t '#' -v
/light/LIVING_TABLE/state 1

Home Assistant

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Home Assistant , , .

, Home Assistant MQTT Discovery — , Home Assistant MQTT. JSON-, .

Home Assistant :

mqtt:
  username: !env_var MQTT_USER
  password: !env_var MQTT_PASS
  broker: !env_var MQTT_HOST
  discovery: true
  discovery_prefix: /homeassistant

Janus MQTT

Janus MQTT Home Assistant . 100 , 17 , 6 (/) 5 . . .

Docker

NanoPi docker-compose.yml.

, , , .
10 M. Golang!

/ :
https://github.com/phoenix-mstu/janus-mqtt-proxy.

docker-compose :
https://github.com/phoenix-mstu/smart_home/tree/master/raspberry.

, : 52.59.242.204:26927 ( ), / — habr/habr, — MQTT, . . , :

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