Arduino based USB Pendant for Linuxcnc

we use a Button on the main panell to reconnect the pedand
you can simply run the HAL again
or just by Mcode get the loadrt usercomp reloaded
that workes for most USB

hello everybody,
I was investigating for a flexible arduino-based, USB pendant solution and I came up to this old thread, since I did not find something more exciting (except HID based, which I would avoid).
My question: is there an "official" source for serialcon2? I found a link here, but the serialcon2.zip contains serialcon versions (without "2"). I could compile/install it anyway and it seems to be ok for my linuxcnc 2.8. What is the difference to "2"?

Any other suggestions?

kind regards, Gerd