We thought about Bluetooth but the range wouldn't be great even for a home apiary. WiFi is good but drains batteries quicker. Alternatively there is LoRa which has very good distance and low battery consumption.
I'd love to be able to incorporate a load cell to monitor hive weight too. There are a few beekeepers out there who have managed it, but I haven't been able to find out from them if you have to tare the cells occasionally due to the drift in accuracy over time under constant load.
Even if it's inaccurate (to a point), it would be quite useful to see if there was a sudden change in weight for swarming reasons and what not.
It just makes me think, if I had an out-apiary say 10 miles away, I'd like to be able to see what the readings are, say:
Hive 1 - sudden weight loss
Hive 2 - really low temperature
Hive 3 - high humidity
Just little bits of information like this would give me something to think about on the journey - ie "has hive 1 swarmed?", "has hive 2 died out or has it been knocked over?" and maybe "what on earth does high humidity mean???"