yangsong8-a1 commented on PR #17461:
URL: https://github.com/apache/nuttx/pull/17461#issuecomment-3633154629

   > @yangsong8-a1 this testing you did is really cool:
   > 
   > ```
   > Compile usbhost: ./build.sh sim:usbhost -j8
   > Start usbhost: sudo nuttx/nuttx
   > Compile usbdev: ./build.sh sim:usbdev -j8
   > Start usbdev: sudo nuttx/nuttx
   > Enable usbdev as cdcacm: input conn 1
   > In usbhost, input cat /dev/ttyACM0 &
   > In usbdev, input echo hello > /dev/ttyACM0 multiple times.
   > Note that the second hello does not display correctly in usbhost.
   > ```
   > 
   > Please include it at usbhost board profile: 
https://nuttx.apache.org/docs/latest/platforms/sim/sim/boards/sim/index.html
   > 
   > There is missing the clear steps like you did here and the usbdev example 
there is very complex.
   
   I've added it. Please check if it's appropriate. Thank you.


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