https://devzone.nordicsemi.com/f/nordic-q-a/97249/sd_ble_gatts_hvx-returns-error-0x3401Hello We are using sdk 17.0.2 and softdevice s140_nrf52_7.2.0_softdevice We are using both central and peripheral mode in our application. First we start advertisement and mobile application connects with our device. When mobile connects with our deviceen-USTelligent Community 13Mon, 06 Mar 2023 05:31:31 GMThttps://devzone.nordicsemi.com/thread/413410?ContentTypeID=1Mon, 06 Mar 2023 05:31:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fafb2d14-fde3-430c-9a87-92bb1aa01a36Omkar Rana<p>We have found the issue , the connection handle passed to the HVX was wrong.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/413314?ContentTypeID=1Fri, 03 Mar 2023 16:19:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c3c6e82d-42cb-4344-9946-fac901611a78Susheel Nuguru<p>Can you try to set the attribute when you receive the event that sys attribute is missing instead of setting it in the connected event?<br /><br /><pre class="ui-code" data-mode="text"> case BLE_GATTS_EVT_SYS_ATTR_MISSING: // No system attributes have been stored. err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0); APP_ERROR_CHECK(err_code); break;</pre></p> <p>Someone had the similar behavior&nbsp;when&nbsp;<span>the length of the data sent using HVX exceeds the length of the&nbsp;MTU_SIZE set</span></p><div style="clear:both;"></div>