what will cause BLE_GAP_EVT_TIMEOUT?

Question

HI,all! 
 In the funtion on_ble_evt(), there is one of the events named "BLE_GAP_EVT_TIMEOUT", can someone please tell me what situasions might cause this event? (be better to list all possiable situasions )
By the way, according to my observation, when the device's advertising time proceeds APP_ADV_INTERVAL, it will cause the event, is that right? 
 Looking forward to your reply, thank you!

Balaji Srinivasan · Accepted Answer

Hi there, 
 BLE_GAP_TIMEOUT_SRC_SECURITY_REQUEST is caused when the central does not respond to the security request initiated by the peripheral for 30 seconds. The message sequence chart describing this situation is available the SDK Documentation (also in the link below). 
 devzone.nordicsemi.com/.../a00856.html 
 More on this timeout is available in the section titled 'SM timeout' Volume 3, Part H, Section 3.4 of the Bluetooth Core Speicification.
More on Slave Security Request is available in section titled 'Slave Security Request' Volume 3, Part H, Section 2.4.6 of the Bluetooth Core Speicification. 
 Cheers,
Balaji

what will cause BLE_GAP_EVT_TIMEOUT?

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