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Description
Is your feature request related to a problem? Please describe.
Unable to indicate DSR back to the host because it is not supported by USBx. This is a common feature of the CDC-ACM class and limits the use of the driver.
Describe the solution you'd like
Ability to set control line status for outgoing lines (like DSR) so that the host can be notified when the device is ready to receive data.
Describe alternatives you've considered
Manually updating the USBx driver is the only reasonable alternative but it would be better if it was implemented and kept here by the maintainers.