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Home Assistant connector for MoaT-KV

Project description

This is a link between Home Assistant and Moat-KV.

It will

  • set up standard config for Home Assistant in MoaT-KV

  • have command-line support to register (or not) devices

Principle of Operation

Home Assistant talks via MQTT. MoaT-KV has a quite versatile MQTT adapter. Thus we can store Home Assistant’s entitiy configuration, plus their state, plus the commands Home Assisant issues to get things to change their state, in MoaT-KV.

MQTT can only transmit binary data. DistHASS thus creates a few codecs that support binary data (translating them to on/off), integers/floats, and JSON.

Thus, bottom to top:

  • Mosquitto on port 51883

    • basic installation, does not need persistence or retained messages

    • Serf would work, but it imposes additional delays

  • MoaT-KV, using Mosquitto as a backbone

    • a special user with conversion rules for JSON etc.

  • DistMQTT

    • retained messages are stored in MoaT-KV

    • transparent channels to forward MQTT messages unmodified, if required

    • anything else is broadcast as a MoaT-KV message

    • uses port 1883

  • Home Assistant, or anything else MQTTish for that matter

    • must use MQTT 3.11

If you have devices that only can use MQTT 3.1, you can teach them to talk directly to Mosquitto, via a transparent range.

Setup

  • Run moat kv ha init -i

  • Add a MoaT-KV user for Home Assistant and set its conv parameter to hassco:

    moat kv auth user param NAME conv hassco
  • Start Moat-MQTT with something like this configuration:

    kv:
        server:
            host: '127.0.0.1'
            port: 27586
            auth: "password name=NAME password=PASSWORD"
        topic: [mqtt, msg]
        transparent:
        - [home,ass,event]
        - [home,ass,state]
        retain: [home, ass]
    listeners:
        default:
            max-connections: 500
            type: tcp
        local-tcp:
            bind: 127.0.0.1:1883
        remote-tcp:
            bind: 10.107.3.18:1883
    timeout-disconnect-delay: 2
    plugins: ['auth_anonymous']
    auth:
        allow-anonymous: true

    If you have devices that use MQTT directly, modify the transparent list to include your current MQTT prefixes.

  • Modify Home Assistant’s MQTT integration to do autodiscovery. If you’ve set it up via the GUI, the file you need is .storage/core.config_entries. Find the entry with "domain": "mqtt" and modify its data entry to read:

    "data": {
        "broker": "127.0.0.1",
        "discovery": true,
        "discovery_prefix": "home/ass/dyn",
        "port": 1883,
    },
  • Run moat kv ha conv.

    This teaches MoaT-KV to auto-convert the Home Assistant data so that everything in MoaT-KV sees binary states as booleans, temperatures are floats, the configuration’s JSON is a real data structure, and so on.

    Without this conversion, it’s all strings. We don’t want that.

  • Restart Home Assistant.

  • Run moat kv ha add light foo bar.

    A new light should show up in the Home Assistant GUI.

    You can try to turn it on, but it will go off by itself a second or two later because there’s no device yet.

  • Run moat kv ha state light foo bar True.

    This command changes the state manually.

    In Home Assistant, the light’s indicator turns on.

  • Adding an actual device that monitors the light’s MoaT-KV command entry / its [MoaT-KV-]MQTT command topic, actually affects the hardware, and changes the state, is your job.

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