Since we are on HACKaday..

A lot of people asked me about saving the config oto the device so that after you have set up the connection once, you can take it and put it wherever you need datalogging and it will automatically configure itself without the need of a initial AT-Chat.

I haven't had the time to try more on writing flash (without causing the chip to reboot, MPU?). Therefore a workaround for those who really want to have it as a "plug in and forgett device"

http://www.esp8266.com/viewtopic.php?f=11&t=461&start=10#p2925