I used NRF52832 before, nRF5_SDK_14 for the software, using the ble_app_hrs_rscs_relay example in the SDK, NRF52832 as the host to connect a heart rate wristband, and then power on the wristband to reconnect, or the wristband can be reconnected and upgraded when it is turned off and on again. I encountered a problem after nRF5_SDK_17.0.2. After each full chip erase, the programming program is connected normally for the first time. After the bracelet is disconnected, it can no longer be connected. The error code 4102 is always printed, which means "Encryption failed. because the peripheral has lost the LTK for this bond. "Encryption failed because the peripheral has lost the LTK for this bond. Many people encountered this problem online, but I didn’t understand the reason. Can someone tell me how to make the bracelet reconnect automatically?
