https://devzone.nordicsemi.com/f/nordic-q-a/108576/angle-of-arrival-cte-readingHi, Attempting to establish a connection from the nRF app to request the Constant Tone Extension (CTE) of the direction-finding peripheral and central is resulting in an error. The peripheral example indicates the following -&gt; warning: &lt;wrn&gt; bt_dfen-USTelligent Community 13Fri, 23 Feb 2024 21:57:28 GMThttps://devzone.nordicsemi.com/thread/470529?ContentTypeID=1Fri, 23 Feb 2024 21:57:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b72ae13d-fb42-41d3-8eae-c32aaed4a304Amanda Hsieh<p>Hi,&nbsp;</p> [quote user=""]<span>-&gt;&nbsp; warning: </span><code>&lt;wrn&gt; bt_df: bt_df_set_conn_cte_rsp_enable: CTE response procedure is not supported.</code>[/quote] <p>It seems returned by&nbsp;<a href="https://github.com/nrfconnect/sdk-zephyr/blob/2977baaec1238116c8fb8ae76757afc173e1dc07/subsys/bluetooth/host/direction.c#L1184C7-L1184C37">https://github.com/nrfconnect/sdk-zephyr/blob/2977baaec1238116c8fb8ae76757afc173e1dc07/subsys/bluetooth/host/direction.c#L1184C7-L1184C37</a>.&nbsp;</p> [quote user=""]Is this the correct approach for obtaining CTE? My goal is to use Angle of Arrival (AOA) for transmission to the application.[/quote] <p>An<span>&nbsp;</span><a title="The relative direction at which a propagating RF wave that was transmitted using an antenna array is incident on another antenna." href="https://infocenter.nordicsemi.com/topic/nwp_036/dita_common/glossary/glossary.html#aoa"><dfn>AoA</dfn></a><span>&nbsp;</span>system features the antenna array on the receiver side so that by measuring the phase-shift of the incoming signal, the receiver can determine the direction of the incoming signal. See&nbsp;<a title="Angle of Arrival and Angle of Departure methods" href="https://infocenter.nordicsemi.com/topic/nwp_036/WP/nwp_036/aoa_aod.html?cp=18_4_1_0">Angle of Arrival and Angle of Departure methods</a>.&nbsp;</p> <p>Regards,<br />Amanda H.</p><div style="clear:both;"></div>