* Allow inversion of input GPIO * Fix formatting
ESP8266 uses D1 (5) and D2 (4), ESP32 uses 21 and 22. Both provide defines for SDA and SCL pin numbers though
Received signals are published to the subjectRF2toMQTT topic (/RF2toMQTT). However, echos of mqtt messages are published to the topic subjectGTWRF2toMQTT (/433toMQTT). That seems quite inconsistent.