I am happy to hear that you solved your problem and thank you for sharing the solution with us. So you defined the data interface class code as vendor specific class and it works fine in cdc? What about the communication, subclass and protocol? have ...
I have the information about all the USB descriptors of the modem I am using right now, but I am stuck with defining our own descriptors and communicate with a specific interface (such as AT interface) since I do not have a good understanding of the ...
