I think I may have led you down the wrong path. I think the driver will try to complete the exposure and download the image before it considers the capture to be complete, and therefore running the close shutter script. But, the close shutter script must be run first, before the exposure can be completed and the image downloaded.

So I don't think that will work.

Your best bet is probably to modify one of the existing drivers to match the relay hardware you have.

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