https://devzone.nordicsemi.com/f/nordic-q-a/102970/nrf5340-usb-cdc-acm-getting-stuck-when-sending-more-than-400-bytes-at-a-time-from-pcI am tyring the USB CDC ACM echo sample code. When I am sending more than 400 bytes using a python code from PC, both PC side code and nrf53 usb part is getting stuck. If I make the data size aroudn 300 bytes or less, it is working fine non-stop.en-USTelligent Community 13Fri, 18 Aug 2023 11:59:10 GMThttps://devzone.nordicsemi.com/thread/442076?ContentTypeID=1Fri, 18 Aug 2023 11:59:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf3c89a4-5dda-4f80-bede-fe71908c9c58Susheel Nuguru<p>Thanks for letting us know that. It will help others who stumble with the same issue. Marking this reply as verified.</p> <div style="left:169px;top:-20.0028px;"> <div></div> </div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/442057?ContentTypeID=1Fri, 18 Aug 2023 10:45:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6cbb21f4-a5f7-44d5-b531-b2af23a4de93vinodsdw<p>Actually I enabled&nbsp;</p> <div> <div><span>CONFIG_USB_DEVICE_STACK_NEXT</span></div> <div><span></span></div> <div><span>That created the issue.&nbsp;</span></div> <div><span><span>I disabled it now and it fixed the problem. I think the&nbsp;</span></span> <div> <div><span>CONFIG_USB_DEVICE_STACK_NEXT is buggy.</span></div> </div> </div> </div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/442050?ContentTypeID=1Fri, 18 Aug 2023 10:10:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c06146e6-9f52-459a-b9fd-9a279f1b8b8cSusheel Nuguru<p>How are you testing this? What is on the other side listening to your data?&nbsp;<br />If you have PC listening to this data in a terminal emulator then set the DTR/DSR in Flow Control to see if that helps.</p><div style="clear:both;"></div>