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PSoC 4

D_Sd_3235936
New Contributor II

 

Connection went well.

Pairing is a success. Device was added to whitelist. 

But on disconnection and connection (works) but pairing (fails)  I get this:

[11:08:46:649] : 'Authentication Error Notification' event received
[11:08:46:649] : Status: AUTH_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE
[11:08:46:649] : 'Misc Event Notification' received
[11:08:46:649] : Event Code: 0x0029 (GAP_ENCRYPT_CHANGE)
[11:08:46:649] : Event Data: Encryption OFF
[11:08:46:649] : Event Data: [00]
Error: gpm.M1108: Authentication failed.

 

Does not happen when I do the same process using an android,

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1 Solution
Yugandhar
Moderator
Moderator

Hello,

In the BLE component, Go to Gap Settings ->Security and check the Encryption Key size. The valid values of encryption key size are 7-to-16 bytes.
Also, At Peripheral side when encryption is failed due to LTK loss, CYBLE_EVT_GAP_AUTH_FAILED event with reason code CYBLE_GAP_AUTH_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE is given to application. 

The authentication error code CYBLE_GAP_AUTH_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE will occurs due to Insufficient key size for the security requirements of this device or LTK is lost 

Thanks,
P Yugandhar.

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