[Pharo-project] Opening a serial Port with Pharo on Linux

[Friedrich Dominicus]

I'm stuck. I try to open a serial Port on Linux using Pharo.

The code is as simple as:

port := SerialPort new.
portName := '/dev/ttyUSB0'.
port openPort: portName.

Now this opening fails for "whatever" reason. 
Anyway in the console I got the following "messages":

PluggableTextMorph>>handleEdit: in Block: [result := editBlock value]
Error while opening the serial port (/dev/ttyUSB0#4
                                                    
).
Error: Cannot open '/dev/ttyUSB0'

It seems after the USB0 there is not the "end" of the string but some
gibberish.

I tried to extract the code for the SerialPlugin and use it stand-alone
in C andwrote the following:

#include <stdio.h>
#include "SerialPlugin.h"


int main(void) {
  char *portName = "/dev/ttyUSB0";
  int baudRate = 9600;
  int stopBitsType = 1;
  int parityType = 0;
  int dataBits = 8;
  int inFlowControlType = 0;
  int outFlowControlType = 0;
  int xOnByte = 19;
  int xOffByte = 24;
  int iRval; 
  

  iRval = serialPortOpenByName (portName, 
                                baudRate, stopBitsType, parityType,
                                dataBits, inFlowControlType, outFlowControlType,
                                xOnByte, xOffByte);
  iRval = serialPortCloseByName (portName);
  return 0;
}

And there is no error while using it this way in C. So what 
is broken?

Regards
Friedrich