runaway_pancake:
https://www.arduino.cc/en/Reference/SoftwareSerialConstructor
Yes, Thank you. That is probably what the BASCOM compiler already does and surely the solution to follow.
The amount of data is not overwhelming: one byte @ 9600 Baud every second...
I suppose that if the Serial.begin(9600); is not invoked, the TX-RX pins are available for softwareSerial.begin()?
I will try that soon and let you know.