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By rbm78bln
#94412 Actually the ESP8089 (and it's successor the ESP8266) was designed to be a simple wifi interface for cheap tablets and stuff connected to the host via sdio from where it would also receive its firmware.

This project still seems to be kinda active: https://github.com/al177/esp8089
This one here gathered some nice infos: https://github.com/notabucketofspam/ESP8089-SPI
But basically they're both the same.

Nevertheless - as the others said already - a usb thingy will de a better job.