C version of esptool?

[rezarethink]

I will have an ESP32 and an STM32 on my PCB. I need to be able to perform OTA upgrades to both. Wondering if there is a C port of the esptool that will allow me to reflash the ESP32 from the STM32? The ESP32 that I'm using only has 16mbit of flash (internal) but the STM32 has 64mbit. Planning on having the firmware stores on the STM32 and pushing it out to the ESP32.

I would prefer to not port the esptool.py to C - is there any C code out there that I could use?

Thanks,
Reza

[GreenGiant]

Same here. I am going to be loading OTA updates to an esp32 over UART from an STM32 so need a c or c++ loader. Did you have any luck with this or is it a case of writing our own version of the python script in c?

[vjacobs]

Hello,

if your ESP32 is already running code (e.g. v1.0) which you then want to update (e.g. to v1.1), you can use the native OTA update functionality of the IDF to update your ESP and then send the actual binary through a link of your choice from the STM32 towards the ESP32. For example, you could devise some protocol over UART that sends the binary data from the STM32 to the ESP32. The receiving UART routine can then perform whatever check on the received binary data and use the OTA functions from the IDF to write to flash. This way, you can also use 2 partitions and dual boot.
This code then of course needs to be part of v1.0 already.

[Andrzej]

Similar thread under a name 'IDF and ESPTOOL_PY Licence Clarification Request' is here: viewtopic.php?f=13&t=13805 .