Hey there,
I’m afraid I don’t have any progress on this project.
I tried setting it up wit a nodemcu chip running ESPeasy but I didn’t manage to get the chip to read the sensor unfortunately so I gave up.
I have managed to set it up with HA while connected directly to the RPi. I don’t have the exact code at the moment but I can paste it to you when I get home.
I disconnected it though because it just kept adding pulses to a counter and I think it slowed down my HA by creating very big DB files.
Here is a post with my code and further discussion
How did you manage it through mqtt?
Could you share some specifics of your set up?
What exactly is it reporting?