It's actually better that they are non-blocking as things like abort wouldn't work very well otherwise. The older USB card works the same way, for example opening the shutter is just turning on a relay and the driver polls input status until the open limit switch triggers and turns the relay off. The hardware also stops the motors automatically when limits are reached. Currently the driver polls status every second by default, I wonder if that's too fast for the HTTP server in the Arduino as the driver source says the device should respond within 1-9s, but we'll see when you get to test it

PS: thanks, looking forward to that

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