Python on service startup tosses up an error because it doesn't get connected to the network right away on boot.

[NonaSuomy]

Maybe add something like

[Unit]
Description=Home Assistant Satellite
Wants=network-online.target
After=network-online.target

At the top of your service example.

I tested this and it prevented the error.

[synesthesiam]

Thanks! I've added it to the repo.