[zeusly]

As someone who has built products with a Raspberry Pi, I'm not sure I would bet on a WIFI connection.

I can almost guarantee you that you will sit in your car and scream bloody murder because the WIFI ist not connecting.

My products had to work with a lot of other networks around and were built on a Model 3 B, maybe it has improved since then.

Sadly I can't point you into the direction of solutions because we just switched to Ethernet.

[TaylorAlexander]

Some kind of LoRa radio would do well. This 433 mhz one would have long range with a bidirectional link.

https://www.adafruit.com/product/3179

[GordonS]

Haven't heard of LoRa before - is it some kind of alternative to zigbee?

[MrMid]

It has been presented to me as an alternative to GSM. It's short for Long Range. They marketed it as a product for smart city, not smart home.

But of course that doesn't mean you can't use it that way.

[zaabis]

latest ones seem much more stable. No issues so far. v >= 3b+