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Since ESP8266 can self program on wifi, can we use it to program arduino too with the binary sent via wifi? my arduino is connected with reset+RX+TX pins and shared power. Has this been already done?

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If you use Linux, you can use a simple Telnet to Serial sketch in esp8266 to upload with avrdude to Uno over esp8266. Only on Linux can avrdude use telnet to do a serial upload.

For upload from IDE on any OS there is JeeLabs ESP Link firmware for the esp8266.

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  • plenty of ways on other os to patch things so arduino looks to be connected over serial as far as avrdude is concerned- for example com0com makes virtual serial ports...
    – Abel
    Mar 17 at 23:24
  • @Abel, did you test it?
    – Juraj
    Mar 18 at 5:52
  • haven't done it for avrdude yet, but i did have the need to do something similar for a serial user interface program to connect to a stream that had to be encapsulated by ssh first.
    – Abel
    Mar 18 at 11:54
  • tested with pi in the middle (avrdude-com0com-customExe-pi-customProgram-uno). gotchas found: bootloader baud, and stable re-entry to bootloader. no reason to believe any other program attempting this over serial would behave differently. i implemented re-entry via usb port poweroff and poweron via rpi uhubctl, but it might be possible with hardware (reset pin), a modified bootloader, or crashing? the main on command (casting 0 to a function pointer and calling it).
    – Abel
    Mar 20 at 13:43
  • @Abel, my sketch linked in the answer resets the target at new telnet connection. what problem with baud rate?
    – Juraj
    Mar 20 at 14:45

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