Very cool this great project. All is very easy, espacily the web-gui-elements ..
I'm now interested to put a cheap Arduino pro mini (avr 328) as an extension to the ESP with time-critical arduino-sketches ex. micros() and port extensions etc.
I want to communicate over tx/rx or spi and it would be very cool and elegant
when its possible to programm the arduino with with a .bin-file (ca 32k.) over the serial line or like the example esp8266AVRISP with spi.
Best regards
gluefunk