#error "This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor."

[5calV]

When trying to compile it for an ESP32-WROOM-32, I get following error:

#error "This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor."

I thought this lib is for the ESP32?

[dominicdumont]

Are you sure it's not another library thats giving you this error? I have searched for this string and could not find it anywhere in the code base.
I use this with an ESP32 / ESP32-S3 and it does work. From what I can see from the library settings the support platform are:
"platforms": [ "atmelavr", "espressif8266", "espressif32" ]
https://github.com/knolleary/pubsubclient/blob/master/library.json