I understand and agree but each solution corresponds to the point of view. I see 8266 mainly as a slave co-processor for wireless connections and I would like to switch it only rarely... for reasons of battery life. Somebody asked on forum for SD card as external storage and we would have it on board (ESP-12F) with no additional cost... and anyway this flash memory "eats" battery capacity. The STM32F411 has up to 5 SPI, one could be used for this activity... it would need only to make the appropriate pads on the PCB for ESP-12F... It can be used by those only who want...
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