https://devzone.nordicsemi.com/f/nordic-q-a/2735/can-t-connect-directly-after-i-exit-our-app-by-back-key-on-phoneHi, My behavior is as follows Turn on my device(use 51422) and advertising(2 Service and 3 Characteristic) Turn on my cell phone(Samsung Note3),scan my device and connect successfully Send data from my device to cell phone through sd_ble_gatts_hvxen-USTelligent Community 13Tue, 14 Nov 2017 10:43:53 GMT