I use nRF51822( BLE nano) central mode to connect annother BLE nano (ibeacon mode), then I call disconnection to the peer address. Sometime, the disconnection callback will be waited for more than 6 seconds to start after the disconnection request. How can I reduce the disconnection waiting time? Then How can know if the peer (ibeacon mode) has any problem to response for the disconnection request from the central mode site?