https://devzone.nordicsemi.com/f/nordic-q-a/52362/disconnect-too-late-detectedHi, we are using a sensor which streams out buffered data to an ios or android app. If we face a disconnection the data gets buffered and send when reconnected. But the issue is that the smart device detects the disconnection quiet early while theen-USTelligent Community 13Mon, 23 Sep 2019 08:00:01 GMThttps://devzone.nordicsemi.com/thread/211129?ContentTypeID=1Mon, 23 Sep 2019 08:00:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f59a787e-b8e5-4e27-874d-e3f573a70774Vidar Berg<p>Hi <span>Constantin</span>,</p> <p>Have you checked what the disconnect reason is in the&nbsp;BLE_GAP_EVT_DISCONNECTED event? I.e., if it&#39;s&nbsp;BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION (0x13) or&nbsp;BLE_HCI_CONNECTION_TIMEOUT (0x08). You may get the&nbsp;<span>BLE_HCI_CONNECTION_TIMEOUT if the phone terminates the link without sending the disconnect command.&nbsp;</span></p> [quote user=""]NRF_ERROR_RESOURCES just indicates fine when the package was successfully transferred but short before the disconnect it fails.[/quote] <p>&nbsp;NRF_ERROR_RESOURCES means that the tx output buffer inside the Softdevice is full. To see when packets are sent on the air, you should monitor the&nbsp;BLE_GATTS_EVT_HVN_TX_COMPLETE event, see MSC:&nbsp;<a title="GATTS Handle Value Notification" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.1/group___b_l_e___g_a_t_t_s___h_v_n___m_s_c.html?cp=3_4_2_1_2_4_3_5">GATTS Handle Value Notification</a>&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>