After lots of tests and contributions from many of you, we finally have a functional Arduino code / blocks and prototype for Otto using ESP8266 and coming soon with the help of @Nicolas ESP32
Just collecting all initiatives here in one place and how you can get started into the world of IoT with Otto Blockly, oh and the plus of no memory limitation issues as with nano.
Using ESP8266 or WeMos
@Bill SCHONFELDER you are gonna like this board + shield combo i found on amazon
+Shield Module for NodeMCU ESP-12E ESP8266 it... (More)