Intercept com port and duplicate

[xrj]

There is a device receiving and transmitting data via a USB port. This data are simple string commands. There is a second device that only receives data via USB CDC com port. The data it manages is a restricted part of the string commands and the only data it sends back is a OK confirmation. My question is what kind of driver could intercept the data being sent to the first device and send it to the second. Could it be a UMDF one? Is there any example?

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