Impossible to use secure/encrypted pairing - arduino nano 33 BLE

[maximouth]

I want to use the different levels of authentication for a central to connect to a peripheral.
I've seen in the EncryptedBatteryMonitor example you provide l38 and 39 the way to declare a characteristic of a service which require encryption to write on it:

ArduinoBLE/examples/Peripheral/EncryptedBatteryMonitor/EncryptedBatteryMonitor.ino

Lines 38 to 39 in dff9e41

	// Add BLEEncryption tag to require pairing. This controls the LED.
	BLEUnsignedCharCharacteristic secretValue("2a3F", BLERead | BLEWrite | BLEEncryption);

I've also seen in the source code that it is possible to have other option for it.

ArduinoBLE/src/BLEProperty.h

Lines 25 to 43 in dff9e41

	enum BLEProperty {
	BLEBroadcast = 0x01,
	BLERead = 0x02,
	BLEWriteWithoutResponse = 0x04,
	BLEWrite = 0x08,
	BLENotify = 0x10,
	BLEIndicate = 0x20,
	BLEAuthSignedWrite = 1 << 6,
	BLEExtProp = 1 << 7,
	};
	enum BLEPermission {
	BLEEncryption = 1 << 9,
	BLEAuthentication = 1 << 10,
	BLEAuthorization = 1 << 11,
	// BLEWriteEncryption = 1 << 11,
	// BLEWriteAuthentication = 1 << 12,
	// BLEWriteAuthorization = 1 << 13,
	};

There is also the enum BLE_GATT_PERM_ { (which I don't understand the usage)

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So to go back to the example, I don't understand how the callback function for the pairing works.
There are functions declared between line 58 and 151 named callbacks, and key management.
I don't understand how to use them, and where to declare them.

In the function setEventHandler, the only handler available are the connect and disconnect.

When I try to use this example, every time I try to pair a device to the example running, I got an error, and no evidence of the callback function called, nothing prints on the Serial port.

Can you help me with this please ? To understand how to use the different callback pairing functions, and the different parameters available and the purpose of the different existing enum and all the things I wonder into this field.

Is there documentation about how to use this feature ?

Is there another existing library usable to use secure pairing between two elements ?

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• Impossible to use secure/encrypted pairing - arduino nano 33 BLE #295 (comment)

[IDC44]

Hello,
Have you managed to use pairing with pass key?
Thanks

[maximouth]

Hello,

No I gave up using the arduino library for that.. like other peope before me with the no responses we get.
I've moved to the nrf library.
As it's a NRF52840 used into the nano 33 BLE board it's good.
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/boards/arm/arduino_nano_33_ble/doc/index.html

It's a little more complicated to use than the arduino library, but at least it's working.
I can pair with a pass key two BLE boards/phone/object...

But if there is an existing solution and a documentation about how to use the arduino library for secure BLE communication I'm up too :)

[secretshardul]

Ping, any updates?