MQTT compatibility with HomeAssistant

[vajpeters]

Since HomeAssistant is getting a defacto standard, it would be nice to create a MQTT compatibility mode with HomeAssistant.

[stuartpittaway]

What's needed to make it work?

[vajpeters]

It's pretty well documented here: https://www.home-assistant.io/docs/mqtt/discovery/ Mainly it's about naming and structure conventions. Would this be possible?

[shampeon]

Just another vote for adding the necessary auto-discovery topics. This would make it incredibly easy to incorporate a diyBMS battery into Home Assistant's new Energy platform.

[stuartpittaway]

A battery or BMS doesn't appear to be in the list of supported discoverable devices. Is the document out of date?

[shampeon]

They would be sensor devices, where you set the class and unit, etc.

For example, this is the discovery topic for one of the sensors from an MPP Solar inverter.

homeassistant/sensor/Inverter_100177/Battery_voltage/config {
            "name": "Battery_voltage_Inverter",
            "uniq_id": "100177_Battery_voltage",
            "device": { "ids": "100177", "mf": "MPPSolar", "mdl": "PIP3048LV-MK", "name": "Inverter", "sw": "61.01"},
            "state_topic": "homeassistant/sensor/Inverter_100177/Battery_voltage",
            "state_class": "measurement",
            "unit_of_meas": "V",
            "icon": "mdi:battery-outline"
        }

[natiz]

+1 for this, I would look into adding a esphome component (a custom one for starters) instead of using mqtt directly.

Have a look at the Daly BMS component for inspiration: https://github.com/esphome/esphome/tree/dev/esphome/components/daly_bms

[Linusten]

+1 on this, maybe someone is able to add this :)

[schmue81]

+1

[stuartpittaway]

It's in the pipeline!