• https://hackaday.com/2015/09/18/transparent-esp8266-wifi-to-serial-bridge/
• https://github.com/LowPowerLab/DualOptiboot

documentation on optiboot

• https://github.com/Optiboot/optiboot/wiki/HowOptibootWorks
• https://forum.arduino.cc/index.php?topic=299046.0
• https://github.com/sparkfun/tomatoless_boots/blob/master/tomatoless.device.nut
• https://www.avrfreaks.net/forum/uploading-sketch-arduino-procedure

theoretically, we should be able to issue STK_PROG_PAGE commands through uart to upload firmware

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