Thanks Alain, for your feedback and kind words :-)
I am happy to know that you like modbus_tk. I encourage you to participate to this project. There is still a lot to do and ... time is missing.
Moreover, this is a good start when learning about programming. I am sure that if you like programming you will make very fast progress.
Regarding the ARM Linux stuff, I don't have any experience with it. I've read a few articles about it and it seems that you must cross-compile Python. Does anybody have experience with it and can help Alain getting started? Please let me know if you succeed and if modbus-tk works fine on this platform.
Best
luc