V0.4.1

• trash the return of the first initial command and empty buffers
• update workflow to test on 4 platforms (ubuntu/win10/rpi4B/jetson-nano)

V0.4.0

• roll back to 0.2.1
• add fsync + initial dummy command to fix linux write buffer issues with serial port.

V0.3.0

• linux add '\n' to force a flush of the write buffer!

V0.2.1

Serial link working on:

• win 10
• raspberry pi
  (likely working on linux pc and jetson nano as well, but not validated.)

V0.2.0

• attempt to fix unstable USB link
  • working on windows 10
  • not validated on linux based OS platforms.

V0.1.0

Initial release

• known issue: serial port does not always response:
  • windows performs a little better.
  • linux oses seems to be more affected.