https://test-devzone.nordicsemi.com/f/nordic-q-a/88401/i-want-to-start-adverting-at-the-push-of-a-buttonHello SDK starts adverting when reset. I want to start adverting at the push of a button. SDK version : 17.0.0 SWDevide : s112 When the button is pressed as above, ble_advertising_start(&amp;advertising, BLE_ADV_MODE_FAST); called but it doesn&#39;ten-USTelligent Community 13 Non-ProductionMon, 30 May 2022 14:24:16 GMThttps://test-devzone.nordicsemi.com/thread/370030?ContentTypeID=1Mon, 30 May 2022 14:24:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38f34f9d-c514-4fa0-85f6-f57cbe1bbcc3Hung Bui<p>Hi ,&nbsp;</p> <p>Error 8 means&nbsp;NRF_ERROR_INVALID_STATE. You can find this information if you look at the ble_advertising_start description.&nbsp;</p> <p>This happened most probably because the device is already advertising and you call&nbsp;<span>ble_advertising_start() again, o</span><span>r if the softdevice is not initialized.&nbsp;<br />Please try to add a flag, if the device is already advertising you shouldn&#39;t call&nbsp;ble_advertising_start() again.&nbsp;<br /></span></p><div style="clear:both;"></div>