Rad Pro: MQTT server support

[mouldybread]

Apologies if this is only tangentially to Radpro, I had originally imagined I might need the flexibility of Radpro but on further consideration it might be possible with stock firmware.

Is anyone here using RadPro to output data to an MQTT server, and if so, how? I'd like to get the data in to Home Assistant via MQTT for monitoring and alerting.

I have an FS 5000 which can output data over usb/serial with stock firmware but being anchored to a larger server is not ideal.

Going a step further I see there are some DIY Geiger Counters using an ESP8266: https://github.com/steadramon/ESPGeiger

There's enough room inside the FS 5000 to mount a WEMOS D1 and i'd like to keep the sealed case+screen.

Since ESPGeiger counts the pulses, is there somewhere on the FS 5000 board I could use to read the pulses, and power the ESP?

Am I right in thinking I might be able to connect the ESP8266 to the speaker to read the pulses? Then I guess I can pull ground and VCC from the USB socket if there aren't any convenient pads.