https://devzone.nordicsemi.com/f/nordic-q-a/26755/ble-disconnect-with-0x16-reasonHi, I have two nrf51822 device, on work as GAP Central, another work as GAP Peripheral.The two device use different connection parameters, after the connection is established, Peripheral device send BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST to the Centralen-USTelligent Community 13Fri, 10 Nov 2017 08:35:07 GMThttps://devzone.nordicsemi.com/thread/105180?ContentTypeID=1Fri, 10 Nov 2017 08:35:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:42d0dd12-c955-4621-8976-297991664827Ian<p>Yes, use <code>sd_ble_gap_conn_param_update(p_gap_evt-&gt;conn_handle, NULL)</code> can avoid peripheral disconnect the connection. Central must response BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST, if central ignore it, the peripheral will disconnect.</p><div style="clear:both;"></div>