Hi,
I just started using the Arduino IDE (Linux version 2.3.1) with a ESP8266 - works perfect. 
But one annoying thing is the serial port scan the IDE performs every now and then. This shuts down the communication to my APC UPS for part of a second, which results in warning messages from the background daemon.
Is there any way to stop the IDE scanning the serial ports (or just a specific one)?
Sorry, if I looked in the wrong places for a solution... 
Many thanks in advance, Peter
Calling @ptillisch as the expert in this area.
Found a workaround for this special case by myself.
I changed the user group of /dev/ttyS5 (where the UPS is connected) to 'root' which is ok for the daemon but my own user can not access this port.
The Arduino IDE now runs without any disruption. 
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