Thank you for information. I have got this board now and indeed it is mentioned in the Sample notes that 0.1 chip revision does not yet support USB Serial JTAG. I also get your points concerning WiFi 6. But now, as ESP32-P4 is available, i hope Espressif could develop some "radio only" chip with BT ...

This board is a bit strange for me.

1) Why did they add USB serial chip and not connected USB JTAG / Serial from ESP32-P4 directly?
2) Why they used ESP32-C6 instead of ESP32 for radio? This would allow to use BT classic too and make it useful for wider range of applications.

Good job! Thank you!

The bluetooth/esp_hid_host is pure Bluedroid example and is not related to NimBLE (it needs CONFIG_BT_BLUEDROID_ENABLED=y).
Do i miss something?
Oh, i see CONFIG_BT_NIMBLE_ENABLED was added to the sample not long ago! I guess you mean this. Thanks for informaton!

What is really lacking is example how to write BLE HID central or peripheral in NimBLE which is rather popular demand. ESP-IDF has blecent and bleprph examples, but it does not help much if you are new to the concept of characteristics, services etc. You have to learn a lot. But once you do, you wil...

>In theory, the HW channels could be reused (recycled) to serve multiple endpoints in round-robin fashion. This is fairly complex and lower-priority at this moment. Actually, this was the point of my question. For example, if IN endpoint reports 4 ms interval we should allocate HW channel and query ...

Can you please be more specific what is meant by " Only 8 endpoints (including EP0s) can be active at the same time" ? Especially in the context of HID devices. You mean only 8 endpoints can have scheduled IN/OUT transactions inside one 1 ms frame? Or is this some enumeration limit, i.e. 3rd HID dev...

We are talking about the case when we use manually generated keys, so we DO know the device key. And we can maintain database of all device keys during production and encrypt firmware on the server exactly for this device only. >Which provides better security than having the key stored on some serve...

Can you please describe in more details your OTA procedure? I agree with you that Espressif pre-encrypted method is overkill if you already have generated own flash encryption keys. 3072-key is absolutely not needed and you should store your BIN on server already encrypted with same flash key. And w...

Is it possible that your ESP32-S3 chip was manufactured before Date Code 2219 ? Check this Security Advisory: https://www.espressif.com/sites/default/files/advisory_downloads/AR2022-004%20Security%20Advisory%20for%20USB_OTG%20%26%20USB_Serial_JTAG%20Download%20Functions%20of%20ESP32-S3%20Series%20Pr...