During the past weeks i’ve worked on getting the FOTA upgrades work on the 2MB boards by Olimex. The wonderful esp-link project by Thorsten von Eicken was a great example of two things: How to concatenate the espfs filesystem image with the firmware images. How to properly write a new image to the flash. It was a nice example to start with. So after a lot of fiddling with Makefiles, cgi routines and esptool – i’ve finally got the OTA working.