ronny130286 wrote: Hi,
you can try this:
github.com/esp8266/source-code-examples/issues/26
I had a similar problem, the result, my Debian 9 user had no rights to read the dev/tty*. You can temporarily test with the description in the first post (see link) if it's okay so do this from second post.
Maybe it helps.
It was a wiring issue. D+ & D- where inverted. It was solved and it works good on LinuxCNC 2.7.14 Debian 7 Wheezy.
For the fun, I have make a install LinuxCNC 2.8 pre1 on Linux Mint 19.1 with RT preempt and RS communication doesn't work. I have already try this solution but it doesn't solve the problem.
