https://devzone.nordicsemi.com/f/nordic-q-a/109385/nrf5340-ble-host-assertion-fail-with-command-opcode-0x200a-timeout-with-err--11Hi Support Team, I&#39;m using BLE in &#39;Split Controller and Host&#39; mode on nRF5340 DK. I ported the sample &#39; peripheral_uart &#39; for appCore and &#39; hci_rpmsg &#39; for netCore, and the bidirectional communication between the appCore&#39;s terminal and &#39;nRF Connecten-USTelligent Community 13Tue, 19 Mar 2024 12:51:08 GMThttps://devzone.nordicsemi.com/thread/474614?ContentTypeID=1Tue, 19 Mar 2024 12:51:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ac15e38f-3a1a-4b0b-b00c-05f6c040343bVidar Berg<p>Hello,</p> <p>The timeout indicates that there is a communication issue between the application and network core. This is likely related to the RAM partition layout discussed in your previous ticket:&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/109325/nrf5340-ble-how-to-create-the-rpmsg_nrf53_sram-in-partitions-yml-during-porting-the-sample-peripheral_uart">nRF5340 BLE: How to create the rpmsg_nrf53_sram in partitions.yml during porting the sample &#39;peripheral_uart&#39;</a>&nbsp;</p> <p>Best regards,</p> <p>Vidar&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/474285?ContentTypeID=1Mon, 18 Mar 2024 11:24:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e911ea8e-57d8-4691-9b08-425cd09f7decYanpengwu<p>Update: adding some trace for this error.<a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/ASSERTION-FAIL-trace.txt">devzone.nordicsemi.com/.../ASSERTION-FAIL-trace.txt</a></p><div style="clear:both;"></div>