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Secure connection between nRF51822 and Android Smartphone?

Hello, i'm programming an android app to connect to the nRF51822 (peripheral). Without any security or pairing settings everything works fine. The Problem: Any kind of authentication and encryption is needed, but in the final Product the nRF51822 has no display or keyboard. Is there any way to establish a secure, authenticated connection to the Chip under that conditions?

In addition to the problem, what is the difference between the "Properties" and the "Permissions" of a Characteristic and what are they used for?

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  • Thank you for your helpful answer, Hung Bui.

    Unfortunately I don't get a "Insufficient Authentication" error (Code 5) in the Android app, instead there occurs error code 137 (0x89: GATT_AUTH_FAIL?). Although the solution works anyway it would be interesting to know what's the reason for this!?

    I have one more (off topic) question: Is there any way to abort the connection to an already paired device?

  • For development i'm running android 4.4.2 in a VirtualBox. But although I still get the wrong error code now everything is working fine. Thank you for your help and the good Support.

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