There is no option to have more than 7 or 8 simultaneous connections (bluetooth specifications). Maybe, but just maybe in future when esp32 will eventually support BLE 5.x.

If its on windows its most likely issue with EOL, which is different on linux/unix and on windows.

Like i said, both of you have some issues with git clone/pull. Here is release/v4.1 hello-world example: I (194) boot: Loaded app from partition at offset 0x10000 I (194) boot: Disabling RNG early entropy source... I (195) cpu_start: Pro cpu up. I (199) cpu_start: Application information: I (204) cp...

I dont think it is related to Serial, but if you are using mutexes in your code it may be the case.

Looks like both of you may have issue with git pull. As you can see here its log from master branch: I (731) cpu_start: ESP-IDF: v4.3-dev-2136-gb0150615d-dirty and commit: https://github.com/espressif/esp-idf/commit/b0150615dff529662772a60dcb57d5b559f480e2 Also remember you need to update submodules...

Please check that you have clean version arduino-esp32. I know it works, because i am using that combination right now. Arduino: On branch idf-release/v4.2 Your branch is up to date with 'origin/idf-release/v4.2'. Changes not staged for commit: (use "git add <file>..." to update what will be committ...

From your description i think this may be the case:
https://www.freertos.org/FreeRTOS_Suppo ... 44d1j.html

Hi,
like you mentioned passkey shall be a 6 digits, so in case the passkey is shorter (like 12345) you need to add 0s followed by pin (012345). It is bluetooth specification. Im not sure about other part specification, when pin is longer, but esp32 can handle only 6 digits long pins.

https://www.espressif.com/en/news/ESP32_WiPhone
https://www.wiphone.io/

Recommended arduino as component is to use:
- arduino v1.0.4 with esp-idf v3.3
- arduino release/v4.2 with esp-idf master (NOT v4.2)

Other arduino branches (except master) are outdated and wont be updated.