Something like ESP8266_1 connects to ESP8266_2 using serial, ESP8266_1 pulls up and down the GPIO_0, GPIO_2 and RST lines of ESP8266 and starts sending the new firmware.
Most of this is not rocket science, but I am too lazy to reverse engineer esptool.py as to what exactly to send, especially the blob of program code that apparentely is sent to to communicate with the outside world.
I thought maybe someone has done this before? Or has already reverse engineered whatever esptool.py sends (and receives)?
There is a tool for 'lazy' engineer:P
One-press burning tools for ESP8266 modules which is very helpful for batch burning. With the burning tool, you only have to have one press on the button of the software to start the burning, and then the burning process will be completed automatically with the help of UART flow control. If you feel interested, you may please get more about it at http://www.ebay.com/itm/282286419729. It is ready with pin connectors for ESP-01, ESP-12 etc. If your module does not have a matched connector here, you may please using 5 flying wires connecting to a connector which is matched with the connector on your module.
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