How to pair with ESP32 Bluetooth device using passkey/PIN from smartphone?

[avinashs24]

Hardware:

Board: ESP-WROOM-32
Core Installation/update date: 01/JUN/2018
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: 921600

Description:

I am using the SerialToSerialBT example. I am able to scan and discover the Bluetooth device from my smartphone. But the pairing is without any security/passcode. It simply pairs immediately. How to make the pairing using PIN/Passkey entry?

Sketch:

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

void setup() {
  Serial.begin(115200);
  delay(5000);
  Serial.println("Starting..");
  SerialBT.begin("MyESP32"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");
  
}

void loop() {
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }
  if (SerialBT.available()) {
    Serial.write(SerialBT.read());
  }
  delay(20);
}

Debug Messages:

Starting..
The device started, now you can pair it with bluetooth!

[copercini]

It depends of some IDF/Bluetooth core functions that aren't available yet... espressif/esp-idf#1541

once it is released, it will be implemented here as well

[maddmaxamofo]

I am also working on a Bluetooth device that needs this feature. Is there an estimate on its release date?

[nayan27]

@copercini feature was implemented in commit espressif/esp-idf@8571170

Any idea on when it could be available for esp-idf ?

Thank you

[pir0c0pter0]

would be great to have this feature.

[mpbejo]

Hi,
Any idea on when it could be available for Arduino ?
Thank You

[chegewara]

I know its not the best solution, but you can try to use esp-idf functions in your app. Just saying.

[zdclaudy]

Anything more on this? It's a feature i am needing badly.

[HarpreetHeera]

No help.
I am using Lolin D32 with Arduino IDE. I have tried all the ways many examples, still serial terminal app is connecting to esp32 without facing any passkey authentication in bluetooth classic mode.

Looking forward for support.

Thanks

[chegewara]

There is no option to build classic bluetooth with static key pairing (or any key pairing). It is because it requires to change settings in menuconfig. Classic bluetooth can be configured to use SSP (secure simple pairing) or legacy pairing which is controlled in menuconfig.
Only option is to use arduino as component.

[HarpreetHeera]

Hi everyone,
Thanks to all.
I have successfully implemented pass key aka pin code authentication functionality in my lolin 32 using Arduino as IDE in classic Bluetooth mode for sending data over serial Bluetooth profile.
What I did is as following.

1. I uninstall latest version of of espressif esp32 Arduino 1.0.4 release.
2. Install espressif/ Arduino ver. 1.0.1 from board manager.
3. Select board.
4. Download disable_ssp.zip from BluetoothSerial Status && API discussion for passkey/PIN #2320 (comment)
5. Follow the readme instruction available in above zip file.
6. Upload the compiled program.

Open Bluetooth setting in my phone , unpair esp32 device from my old paired list. Rescan for new device then click on the my esp32 device ... Here m the miracle happened .... THE PIN CODE AUTHENTICATION APPEARED .... to pair my Bluetooth esp32 device....

Thanks for all brilliant people who saved my hard work done by providing this solution.

Regards
Harpreet Singh

[chegewara]

Thanks for sharing @HarpreetHeera
As you said, you are using arduino-esp32 v1.0.1, which is very old version and probably at the time it was compiled option i mentioned earlier was not implemented in esp-idf, but glad you achieved what you are looking for.

[HarpreetHeera]

Thanks for sharing @HarpreetHeera
As you said, you are using arduino-esp32 v1.0.1, which is very old version and probably at the time it was compiled option i mentioned earlier was not implemented in esp-idf, but glad you achieved what you are looking for.

Thanks Chegewara ...
for your support and valuable response.
Have a great time.

[choichangjun]

Hi guys. I found some code and I uploaded my repository.
come and try my code. it might be worked !
It should be Arduino IDF and ESP-IDF installed
No need to downgrade version
https://github.com/choichangjun/ESP32_arduino