I suspect USB driver in RPi kernel. It might be more than that. Firstly with QHY163 camera it won't work with USB3 controller on RPi4. I didn't debug that so I don't know what the issue might be. If I force it to use USB2 mode (by either plugging to USB2 socket or using USB2 hub) I'm able to connect to the camera. It doesn't work always though. I noticed that I'm getting the best result if I connect to the camera while there is no power supply connected to it. This prevents the camera from cooling, but I can connect the power after I connect from RPi with INDI. Then I'm able to take a single frame and on the next attempt some error happens. I tried upgrading to the latest and greatest version of INDI and driver, but this just changed the error message I got. In the end I gave up with RPi4 and went with my laptop and powered USB2 hub. This setup works pretty consistently. I guess the next step will be replacing RPi4 with some cheap intel NUC so I don't have to carry the laptop to the mount.

Read More...