Some additional information. I see the same behaviour in PHD2. When I connect my guide camera to PHD2 and the INDI Telescope Simulator, the guide camera keeps on taking exposure. When I change the mount to the INDI Celestron GPS driver, I get exposure time outs in PHD2. Exactly the same as with the internal guider of Ekos. So it seems to me there is some interference with the serial connection to the mount and the USB connection to the Touptek camera's. I had a discussion about this with a member of my astronomy club who has the exact same issue with his Omegon camera and his iOptron mount. I'm not sure of this is of any help but I hope it narrows it down a little

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