https://devzone.nordicsemi.com/f/nordic-q-a/127899/i-can-t-define-an-advertising-file-larger-than-191-bytes-even-in-extendI can&#39;t define an Advertising file larger than 191 bytes, even in Extend. Here&#39;s my code and proj.conf file. My board is an NRF52840. main.c proj.conf Erroen-USTelligent Community 13Thu, 23 Apr 2026 20:14:03 GMThttps://devzone.nordicsemi.com/thread/565418?ContentTypeID=1Thu, 23 Apr 2026 20:14:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67b67309-aef6-4d88-ab1f-b841c5a40e88Marte Myrvold<p>Hi,</p> <p>According to your log,&nbsp;BT_CTLR_ADV_DATA_CHAIN is not getting enabled:</p> <p><pre class="ui-code" data-mode="text">warning: BT_CTLR_ADV_DATA_CHAIN (defined at subsys/bluetooth/controller/Kconfig.ll_sw_split:381) was assigned the value &#39;y&#39; but got the value &#39;n&#39;. See http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BT_CTLR_ADV_DATA_CHAIN and/or look up BT_CTLR_ADV_DATA_CHAIN in the menuconfig/guiconfig interface. The Application Development Primer, Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be helpful too.</pre></p> <p>This config is only available if advanced features (CONFIG_BT_CTLR_ADVANCED_FEATURES) are enabled. Please try setting&nbsp;CONFIG_BT_CTLR_ADVANCED_FEATURES=y in prj.conf and see if that solves the issue.</p> <p>Best regards,<br />Marte</p><div style="clear:both;"></div>