Read json data from other pi

Configuration
1

Raspberry pi 4B
Home Assistant 2021.11.3

I am running a 2nd pi with a Python program, handling a modbus protocol from my Goodwe inverter. All the inverter data is written in a json file every 2 or 3 seconds.
I’d like to show this data on my 1st pi running HA.
I presume this question breaks down into 2 questions
a. how to read the json data from pi2
b. how to display the collected data into various gauges

can anyone give me an idea where to start?

2

It depends on your programming skills.
I would extend the python program so that it sends the json data to mqtt.
Then in HA use mqtt sensors.

3

I have moderate programming skills with Python but never worked with mqtt. If I understand right I have to use a mqtt server in the cloud or set up my own mqtt server?
I had hoped for a bit simpler solution. :expressionless:

4

Home assistant has its own integration to set up your own mqtt server. addons/DOCS.md at 69c68bfac9eb7300ab90727cfde9e557fa475169 · home-assistant/addons · GitHub

This makes setting up your own mqtt server quite easy.

There is also a python Library “paho-mqtt”. I’ve never used this one, but have used other similar libraries. It looks quite simple to use. Here’s an example

https://www.ev3dev.org/docs/tutorials/sending-and-receiving-messages-with-mqtt/

5

Besides MQTT, you could also use a webhook to send the data to HA through HTTP(S)

6

thanks all.
enough options to try out :slight_smile:

7

Another options would be for your pi2 program to serve an API with, for example, Flask. Minimal API is just a few lines of code in Flask.

And then you could use REST sensor to read it

8

I chose the mqtt path. With a cloud broker. A dozen lines of code in my Python program to publish a json string and the same amount of Yaml to subscribe to the topic and put the data on screen.
All thanks for the suggestions