https://devzone.nordicsemi.com/f/nordic-q-a/57135/how-to-disconnect-peripheral-device-after-sending-a-packet-to-central-using-sd_ble_gap_disconnectHi Nordic Team, Requirement- Connect-&gt;Send 1 packet-&gt;Disconnect-&gt;Connect... I am Sending a data packet to central using Timer handler and trying to disconnect using sd_ble_gap_disconnect() in same timer handler. But i am getting &lt;error&gt; appen-USTelligent Community 13Thu, 30 Jan 2020 12:09:31 GMThttps://devzone.nordicsemi.com/thread/231870?ContentTypeID=1Thu, 30 Jan 2020 12:09:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0cb9fa0e-9b8d-4995-81de-8d310d491a84Kenneth<p>Hi,</p> <p>The error code 12290 = 0x3002 is:</p> <p>#define BLE_ERROR_INVALID_CONN_HANDLE&nbsp; &nbsp; (NRF_ERROR_STK_BASE_NUM+0x002) /**&lt; Invalid connection handle. */</p> <p>In other words it seems that&nbsp;<span>m_conn_handle is wrong in this case. Maybe you are already disconnected?</span></p> <p><span>You should likely want some delay between&nbsp;Send 1 packet-&gt;Disconnect, either a fixed delay (e.g. 100ms), or wait for notification sent event before disconnect.</span></p> <p><span>Best regards,<br />Kenneth</span></p><div style="clear:both;"></div>