Pairing device BLE with android and IOS (IDFGH-14718)

[ElenaG391]

Hi all,

I'm trying to pairing a device with android/IOS. The device sends me a PIN:XXX or PIN:XXXX, the device has a limitation with the number of the digits, it send just 3 or 4digits.
I have to include 000XXX or 00XXXX for pairing, we must have 6digits to connect it.

Could you please let me know how I need to change on the code to accept just 3/4 digits to connect with the bluetooth? is that possible? just we will use the numbers that the device send us: XXX or XXXX. without "0".

is it possible set the 4-digit passkey in ESP-IDF?

thanks

[weiyuhannnn]

Hello @ElenaG391, Thanks for choosing our Espressif product! May I know which chip and BLE host do you use? This information will help us better identify the issue you reported. Thank you!

[ElenaG391]

Oh yes! Sorry @weiyuhannnn , I'm using ESP32-MINI-1U and I'm trying to connect iPhone android and IOS.

thanks

[esp-zhp]

@ElenaG391
Are you using Classic Bluetooth or BLE? According to the protocol, BLE only supports a 6-digit PIN, while Classic Bluetooth supports a 4-digit PIN. Could you confirm whether you're actually using Classic Bluetooth?

[esp-zhp]

@ElenaG391 Which host are you using—NimBLE host or Bluedroid host?

[ElenaG391]

@esp-zhp thanks for your answer. we are using BLE and Nimble host.
so I understand that we can't use 4 digits with BLE and Nimble host, is that correct?

If I change my code to use the classic Bluetooth, can I still use the Bluetooth Approved Logo? I understand that yes, it's Bluetooth as well....

thanks!

[rahult-github]

Hi @ElenaG391 ,

so I understand that we can't use 4 digits with BLE and Nimble host, is that correct?

Yes. This is because the spec mandates 6 digits. You need to prepend "0s" in case the pin is lesser than 100000 in value

If I change my code to use the classic Bluetooth, can I still use the Bluetooth Approved Logo?

Classic Bluetooth is BR/EDR (and not BLE) . Is your usecase BLE or BR/EDR ? Anyways, classic bluetooth is also from BTSIG, so it is bluetooth approved.

[ElenaG391]

thanks @rahult-github

I'm using BLE now. Could I start to use classic Bluetooth and we could still use the bluetooth logo, is that correct?
I think that we will use classic bluetooth because we would like to use just 4 digits. thanks

[rahult-github]

Hi @ElenaG391 , The use case of BLE and BR/EDR are different. However, if you are ok to use classic bluetooth that satisfies your requirement, then you can choose so. Please note nimble stack is BLE only stack . If you plan to use classic bluetooth, you will need to use bluedroid stack.

[rahult-github]

Closing issue. Feel free to reopen in case of further queries.