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> Now, imagine your request is actuator.rotate(90).
a good example of something that is not idempotent? As it is based on its current position. Actually idempotent would be: `actuator.rotateTo(Degrees(90))` with a predefined frame of reference, or a frame of reference that you can include in the request.
Like the difference between a servomotor vs stepper motor.
Isn't > Now, imagine your request is actuator.rotate(90). a good example of something that is not idempotent? As it is based on its current position. Actually idempotent would be: `actuator.rotateTo(Degrees(90))` with a predefined frame of reference, or a frame of reference that you can include in the request. Like the difference between a servomotor vs stepper motor.
I used the simpler, non-idempotent rotate(90) example intentionally to illustrate the default trap. How a pure software mindset can dangerously oversimplify a physical action.
Some of my code gets deployed to a PLC aboard a wave power generator hundreds of metres offshore, with a cellular link that might go down in a storm. If something gets unrecoverably wedged, retrieving the device starts at $10K to hire a ship. I feel this blog post hard.
> This is why so many “IoT platforms” die in pilot purgatory. They are built by cloud engineers who underestimate the friction of the real world and overestimate the availability of bandwidth. Indeed. That's why it's important to send your engineers along with the sales folks to these sites. If anything just to get a perspective on things like that. > The first time I deployed code to an actual factory floor, I learn…
Okay, but what about humidity? I was excited to read about a failure mode where the moisture content of air mattered, or at least get mildly clickbaited into learning about a tool called Humidity. Instead there are no other references to humidity apart from the title
The title was actually inspired by a real incident where a device kept failing every afternoon. We eventually realized that condensation from the facility's massive air conditioning unit was dripping onto the enclosure right above the SoC. We were, quite literally, debugging the effects of humidity. I should have included that story in the post itself.