rlucassen2

Hmmm, even reading 1 RPi GPIO port is done by polling AFAICS, according to the CPU power that is used :-( Richard.

Another thing: the bits are inverted for a PCF8574, according to the datasheet: `pinout: datasheet mqtt-io` `pin 4: bit0 bit7` `pin 5: bit1 bit6` `pin 6: bit2 bit5` `pin 7:...

I put an INT version for Raspberry Pi 3B here: [https://xaq.nl/read-pcf/index.html](https://xaq.nl/read-pcf/index.html) Just my 2 cts, R.