@tht I would suggest to go with Sming RTOS. Ive read elsewhere that SmingRTOS is what you will need if you want to use the ESP32 chip. I didnt find it super easy to get to the point where I could build stuff, but did manage it in the end. I have been using the same set of tools as you intend to do: mqtt, rboot and oled screens etc. rboot/ota is a bit tricky, leave that till you have more experience.