Wi-Fi RTT: We actually have a fair bit of the hardware needed for something like this already; we just haven't had any requests from big customers to write the added driver support for it (at least, that's what I understand); also, I'm not sure if hardware support actually has been tested in any way; for all we know it may be broken. Don't be surprised if something like this pops up in esp-idf in an upcoming version, however.
Apart from the common 5GHz wifi request, this would be very interesting to me. I am working on two areas that would benefit from this:
- large scale mesh networks that work with deep sleep
- real time protocol (RTP) for Audio over IP applications using AES67 or RAVENNA
In each case, having a high precision RTC and the ability to precisely synch each device's RTC over the network is essential