Many thanks, that may be the answer I have been looking for. Right now just one box, however that could expand to many all pretty much centrally located. But scattered site comm now does seem to be a possibility. I did some research on LoRa and it definately holds promise. I have found several “add on” devices for Arduino, but so far nothing for my Seeed ESP32. I really like these tiny MCUs and they perfectly fit the project I am working on. But if I can’t find an addon then maybe I’ll use wifi for my local data collection using the ESP32s then transmitting to a Raspberry Pi with a LoRa hat for “burst” transmission of the data to a server on demand from the server. I think I might be able to work that with a Class A network for longer battery life. Lots of design work needs to be done before I put anything on a bread board, but that’s the fun.
Again, thanks for the insight into LoRa.