Apologies first English is not my native language.

I want to work with hyperledger for a bunch of IoT devices.

People owning the IoT devices need to be able to make transactions (with the data).

My question is, do the IoT devices need to work as nodes? As in, have all the ledger data?

Or is there a way for the ledgers to be outside of these devices?

If so, How do you authenticate that the data belongs to the specific IoT devices?

How do people make transactions claiming the device belongs to them?