On Mon, Nov 11, 2019 at 11:11:06AM -0500, Jeffrey Walton wrote:
Hi Everyone,
I'm having trouble with a C application that opens a USB modem. The application is not receiving some data from a USR modem. Conexant modems are OK.
I'm working through https://www.kernel.org/doc/Documentation/usb/usbmon.txt . I found the modem at Bus=01 Dev=24:
T: Bus=01 Lev=03 Prnt=07 Port=00 Cnt=01 Dev#= 24 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0baf ProdID=0303 Rev= 2.00 S: Manufacturer=U.S.Robotics S: Product=USB Modem
This is where my confusion lies. It is not clear to me how to determine which socket to use for step #3 in usbmon.txt. Step #3 says:
# cat /sys/kernel/debug/usb/usbmon/3u > /tmp/1.mon.out
How do I determine which socket to use for Bus=01 Dev=24?
From the above documentation, it says to use "3u" for all devices on the 3rd bus. You want the 1st bus, right? So did you try using "1u"?
I think wireshark can intrepret usbmon output, so maybe just use that instead and point it at the USB bus you want to watch? good luck! greg k-h