Thanks for the many replies. I'll check out all the pointers. There were a couple of references to nano printf. Is this part of c library? If not, and even if it is, where can I find documentation on this and possibly other useful functions. I see that sdkconfig is used to set up a whole pile of com...

Many years ago, like 20, I used to write x86 Ethernet device drivers and other apps. I got convinced to take on an ESP32 development after 15 years of not doing any software, and the world has changed a lot. I'm going through the ESP32 startup stuff, doing the examples etc. I've got Hello_World and ...