• Observing what is going with radio or wifi and its limitation and impact of the environment, I could see a combination of local storage AND radio and wifi. Local non-volatile storage provides the reliability of continuous data collection, and radio or wifi the periodic pick-up.

    I'm sure you observe(d) the growth of smart metering - networking of the utility meters for gas, power, and water - in residential areas, where one device communicates with the next etc. and the one closest to the 'access point' feeds the data of all it into the collection network.

    If the distances become to far between individual locations, you could even put in relays in between... same device (with or without temperature sensor)... and have a simplified logistics... The intelligence on the board can monitor power state and communicate '(battery) exchange' request.

    Having one device within the network wifi enabled, and this device running a web server, you can directly connect any LAN/WAN connected device...

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