sanpei, do you have ESP8266 non-OS SDK code that you need to port to ESP32? No. We don't port low level drivers (codes which operate hardware). it's not necessary, and with understanding of uses, correct behaviors, protocols (,etc.), rewriting a driver is not difficult. After all, it's rarely neede...

Currently we don't have plans for the non-OS SDK for the ESP32. That being said, if you are comfortable writing a scheduler, you can take the ESP-IDF and adapt it to your needs. You will need to provide some stubs implementing RTOS locking functions, and functional equivalents of queue/semaphore/ta...

Give us the non-OS SDK, please. Person or organization like us DO NOT need the things a RTOS have done. We can write scheduler and everything by ourselves. The flexibility has been compromised by binding to an RTOS. Actually, a RTOS make higher costs in many projects, we need learn more things about...