View source for Flashing the AVR through Wifi

==Wifi flashing through ESP8266==
After a long search and many discarded ideas, [http://hackaday.com/2015/09/18/transparent-esp8266-wifi-to-serial-bridge/ this hackaday page] points to esp-link, an esp8266 firmware dedicated to providing a transparent wifi-serial bridge.

[http://www.esp8266.com/wiki/doku.php?id=esp8266-module-family This page] lists available esp8266 modules. I've got an esp-01 (and several esp-03s).

The tool esptool is documented [https://github.com/espressif/esptool here]. This page also explains how to connect the gpio pins to get the device into serial programming mode. Notably:
* GPIO0 to GND to select serial bootloader.
* GPIO2 to Vcc using a resistor
* GPIO15 is already pulled low on the module (apparently)


==Discarded Ideas==
* bluetooth (HC05) appears too unreliable