@mark.lamneck Thanks for posting your findings. Posting on the ESP32 forums more often than not feels like shouting into a void--so thanks for posting what you found.
I definitely agree that the RS-485 support in the ESP32 infra is quite half-baked, at least when compared to other platforms--but as ...

#include "hal/gpio_hal.h"
gpio_hal_context_t hal = {.dev = GPIO_HAL_GET_HW(GPIO_PORT_0)};
gpio_hal_od_enable(&hal, tx_io_num);



I'm working on implementing half-duplex bidirectional UART communication on a single GPIO line with an original ESP32. Setup fixes for single-line UART have been ...

gonna be a LOT more difficult to trace down the HCI error code, because no enum types are provided:
https://github.com/espressif/esp-idf/blob/23e4823f17a8349b5e03536ff7653e3e584c9351/components/bt/host/bluedroid/stack/hcic/hcicmds.c#L192

You'd have to modify the code to add an assert and backtrace ...

I am currently debugging an issue while trying to connect an ESP32 with a Meta Quest 3. The pairing is successful, but then is always terminated 3 seconds later. Setting the error log to verbose gives me:

[ 41477][ I ][BluetoothSerial.cpp:609] esp_bt_gap_cb(): ESP_BT_GAP_ACL_DISCONN_CMPL_STAT_EVT ...

The S3 doesn't have input-only pins, so I think someone forgot to remove those texts. I'll file a ticket to get this fixed. Thanks for bringing this to our attention!

Thanks for the clarification...but the docs still say "input only" in 2 places on this page (one shown here):

Untitled.png ...

You cannot use the WiFiClientSecure library with anything else--it's internally bound to the WiFi module.
However, you can use a wrapper library that utilizes the exact same mbedTLS functionality under the hood--and assign it to any device library that implements Client. I personally suggest https ...

Just for those who might want to tinker with the brown-out detector on their own, here is my sloppy test code for the ESP32-S2. LIKELY WILL NEED CHANGED IF YOU ARE USING A DIFFERENT ESP32 VARIANT!

#include <Arduino.h>
#include "hal/brownout_hal.h" // for adjusting brownout level
#include "soc/rtc ...

(5 farad 3.0v cap has an ESR of ~0.130R, whereas the 20 farad 3.0v cap has an ESR of ~0.050R.)
Funny that a dedicated "5.5v 5F" ultracapacitor "module" costs 2-8x that of two discrete 2.7v 5F ultracaps though.

Don't forget that 2x 5F, 0.13 Ohms in series is 2.5F, 0.26 Ohms. And you'd want to ...

@
Another potential option: "5V" ultracap (2x 2.5V in series) hooked up directly to 3V3

It is worth thinking about two 2.7v/3.0v ultracaps in series...that is, on the 5v rail , not the 3.3v rail. As 2x 5F capacitors are about the same cost as 1x 20F capacitor, that would be a win on the BOM level ...

Start up and set the BOD to, say, 3.0V; when the BOD triggers (interrupt), do your shutdown/cleanup routine, then set BOD to 3.3V to reset the chip and hold it there until power comes back.

If only the brown-out peripheral worked that way, I'd be in tall cotton. It's how I hoped/expected it to ...