Discovery Topics config settings and State Data

[Waz-Cpt]

Hello @revk,

Not an issue, just would like to understand a few things.

I see that you have used abbreviations, do you have any documentation for this?

Been trying to figure out MQTT HA Autodiscovery to implement on a Node-Red hardware device that does not have the MQTT HA Pallette available.

[revk]

Not entirely sure what you are asking.

Oh, you mean like stat-t not state-topic? They are documented somewhere, I just googled.

[Waz-Cpt]

Not entirely sure what you are asking.

Oh, you mean like stat-t not state-topic? They are documented somewhere, I just googled.

Going to need to get creative with the functions in my Node-Red flows. A large deal of learning required on my side.

For reference, they are on the dev docs on github. Just found them.

https://github.com/home-assistant/core/blob/dev/homeassistant/components/mqtt/abbreviations.py

[Waz-Cpt]

Hello @revk,

I am trying to understand what the point of these two difference topics are.

#state/Plant3.Engineering.Faikin
{
"ts":"2025-02-11T13:57:30Z",
"id":"A4E57C68FA1C",
"up":true,
"uptime":2094151,
"mqtt-up":628352,
"app":"Faikin",
"version":"9f65e5b",
"build-suffix":"-S1-V1",
"build":"2024-11-30T08:30:23",
"flash":4194304,
"rst":1,
"mem":62024,
"ssid":"NUtec-IoT",
"bssid":"FE92BF032FE3",
"rssi":-66,
"chan":11,
"ipv4":"10.4.4.34",
"online":true,
"power":true,
"target":21.00,
"temp":22.11,
"liquid":8.36,
"fanfreq":13.5,
"bletemp":22.11,
"blehum":54.84,
"blebat":100,
"mode":"cool",
"action":"cooling",
"fan":"low"
}
#state/Plant3.Engineering.Faikin/status
{
"protocol":"X50A",
"env":23.1,
"online":true,
"heat":false,
"slave":false,
"antifreeze":false,
"flap":true,
"fanrpm":809,
"inlet":23.2,
"liquid":9.3,
"power":true,
"mode":"C",
"temp":21.0,
"fan":"1",
"ble":
{
"temp":23.09,
"hum":59.30,
"bat":2309
},
"autob":"A4C1385531EC",
"autor":0.0,
"autot":23.5,
"auto0":"00:00",
"auto1":"00:00",
"autop":false
}

From what I can work out the first one (parent topic) is what is being used by all the auto discovery config to provide the state values.

The second does not appear to be used anywhere but is value data just provided over MQTT with not specfic end point in HA unless manual MQTT entries are added.

There is a third topic with status type content nut has some data values as arrays.

Is the Status topic actually used in anyway?

[revk]

History - one was specially designed to meet HA requirements. One is used by various logging and reporting stuff that is not HA.

[Waz-Cpt]

So, HA is only using the following topics:
all topics under homeassistant/

then state values coming from:
state/Plant3.Engineering.Faikin

command control topics are under:
command/Plant3.Engineering.Faikin/

The rest are historical or legacy items or if anyone wants to do manual MQTT items.

[revk]

Basically