https://devzone.nordicsemi.com/f/nordic-q-a/1207/nrf51822-nrf-uart-app-disconnect-problemHi All, I use nrf51822 transfer data to nrf uart app for android,when I use following parameter ,the device and nrf uart app work well. #define MIN_CONN_INTERVAL MSEC_TO_UNITS(40, UNIT_1_25_MS) #define MAX_CONN_INTERVAL MSEC_TO_UNITS(1000, UNIT_1_25_MSen-USTelligent Community 13Fri, 03 Jan 2014 15:35:11 GMThttps://devzone.nordicsemi.com/thread/5610?ContentTypeID=1Fri, 03 Jan 2014 15:35:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8bfd05c3-5058-4381-8c3d-b250b9da978aOle Morten<p>This sounds very strange, but I&#39;d recommend you to check the reason field of the ble_gap_evt_disconnected_t struct as given in the BLE_GAP_EVT_DISCONNECTED event to understand why the disconnect occurred.</p> <p>You may also have use in using the <a href="https://www.nordicsemi.com/eng/content/download/39099/660783/file/ble-sniffer_win_0.9.5.zip">sniffer</a> to see what&#39;s happening over the air.</p><div style="clear:both;"></div>