I and Nathan had a good talk on phone a few weeks ago about this project: considering that the IoTeX “W3bstream” IoT (layer 2) network is being built (and already on testnet), I suggested Nathan to implement this project in such a way that his gateway would act as the gateway to W3bstream for any industrial device, rather than a gateway to the blockchain itself. A Raspberry Pi + a secure element could make a nice W3bstream gateway converting PLCs data into verifiable data. Something like this:
That could be expanded with the most popular industrial protocols on the left side (profibus, canbus,…), and be as generic as possible such that these devices could send their data according to some format to the gateway, then the gateway would “pack” them into the W3bstream verifiable message format.
The gateway would have its own DID on IoTeX as well, while it should be in charge of “registering” (i.e. keeping track) of the local devices locally connected to it (possibly, each one of them should have its own DID).
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