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Am 05.11.2017 um 20:07 schröbte Sean Conner:
It was thus said that the Great José María Martínez García once stated:
Ok Pierre.
I installed :
1) Lua (last version) from scratch (compiling and installing)
2) Luarocks (last version) from scratch (compiling and installing)
3) realine-devel from dnf pakage manager (Fedora 25)
4) From luarocks i installed rs232

All of them with no errors.
Now i'm trying to use rs232 library.

This is my program:

local rs232 = require "rs232"

local p, e = rs232.port('ttyUSB0',{
   baud         = '_57600';
   data_bits    = '_8';
   parity       = 'NONE';
   stop_bits    = '_1';
   flow_control = 'OFF';
   rts          = 'ON';

   Try printing both p and e at this point.

And the return values of p:open().