Thanks for above reaction. I finally found it myself after looking to a lot of examples. At a certain moment i found a 'TRUE' added in the Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2, true); That did the trick. Strange is I can't find this somewhere documented. So, if receiving a lot of garbage ( b...

Dear reader, I have a working ESP8266 reading out my digital electricity meter at 115200 8N1 with softwareserial in mode 'inverted signaling' There is a hardware inverter installed between meter and ESP8266 ( by means of and BS170 mosfet and a 10k resistor) As serial bits are inverted by hardware, s...