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Adding GPIO Expander(23017) Support to the library  #784

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@Frenzyritz13

@Frenzyritz13 I just modified my post (found/fixed an error in the logic). Please be sure to use the updated snippet about _ini_pins()

This looks good Brendan! Will test it and get back to you. Also, I am going to be using 2 I2Cs and an Expander based interrupt, I am expecting some issues there as well, will keep this thread updated.

This deserves a separate thread/issue because we are no longer discussing just the ESP32's SPI bus.

Originally posted by @2bndy5 in #722 (comment)

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