Lovely color and nice stars.
If possible try an ethernet cable between your mac and stellarmate and see if that improves things. Or, you could use the Stellarmate hotspot and connect to it at the scope with a tablet or laptop. You could see quickly if the problems are caused by your wifi connection.
It seems to me hotspot mode is what ChrisHoward explains in his tutorial?
Looking through Jasem's tutorial he is setting up using wifi.
Maybe I'm not understanding your question?
ChrisHoward explains how he setup two pi's to manage everything
Is this what you are looking for?
I was going to use a second sbc to control my mount via this method but ended up getting a bluetooth device to do it. Sounds like a neat way to share the load.
I'm pretty sure both Stellarmate and Astroberry are Raspberry Pi specific. Maybe the authors can confirm? I tried Stellarmate on the T4 but no go, I suspect Astroberry would be the same but I haven't tried.
I don't know of any SBC's other than Raspberry PI that will work.
The Stellarmate OS won't boot on the NanoPC-T4. If you know how to manipulate the boot files you could probably make it work. I don't know how so I moved on to the FriendlyArm OS'es that you can download from their website:
Of course they are not plug and play for astrophotography, you will need to setup Kstars, astrometry, hotspot, etc . If you don't mind putting in some work its not really that daunting, just takes some time figuring things out.
I ended up using an Armbian image which FriendlyArm also makes available for download on their website. You need to install all the astro stuff same as the other OS'es but it is pretty easy and the system runs very well.
As far as performance, the NanoPC-T4 is a significant step up from my Raspberry pi 3B, really no contest.
Another plus for the T4 is it can accept an M.2 SSD drive. I have a 240G on mine which costs around $60. With my camera plugged into the T4 USB 3.0 port saving image files to the SSD is almost instantaneous.
Ron Kramer wrote: yeah I use etcher - faster.
So running tests all afternoon. Managed to set park3 as normal. I edited my location again since the long as been off.
After I set it. It changed back to 274 and should be -85.
Sounds about right. Kstars works on 360 degrees for longitude. So 360-85= 275