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Signing might be doable like that but it all depends on the size of the data that you're pushing. if it's a long string of readings that might not be so easy since you might not be able to fit everything in memory still (These devices routinely have <4k of ram). Might be doable to go byte by byte as you build the message and output it. It's certainly a challenging problem.

Yep the libraries I've used can generate a hash byte by byte luckily without loading everything in memory. Here's an example of how I call Amazon services and generate a signature on an Arduino: https://github.com/tdicola/CloudThermometer

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