Most people are using the USB API for extended use. It seems to be more stable than then WebAPI for extended use.
If the camera hangs and you cannot remotely access the camera, you may want to use a workaround to cycle the USB ports of the Jetson.
See this:
Regarding the hex output, I remember encountering some confusion several years ago, but I can’t remember what I was confused about. I think the hex output was reversed for some type of outpu.
I suggest you open an issue on GitHub regarding your question about the meaning of (-32763). I’m not familiar with the details of the output.