In another question about proof of work on Internet of Things devices one answer mentions "it would be capable of outsourcing PoW within it's local area network". This piques my interest. How is outsourcing the PoW done securely?
Premise: Use of very cheap (every cent counts), battery powered (every watt counts) IoT sensors which are incapable of any complex calculation they just measure stuff and send it somewhere. They do not calculate anything. Think of a temperature sensor which periodically sends a simple temperature value via some sort of wireless low power protocol.
How would the setup look like to employ IOTA to support the integrity of these values?