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I have a HSDPA modem attached to the USB port and I use the software that came bundled up with this modem to connect to the Internet. Can I trace the AT commands issued to this modem using a packet capture tool like wireshark.

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1) No, because serial port traffic is not network packets; 2) Which operating system? On Windows you can enable "Log file" in the modem device properties. – grawity Jun 16 '11 at 7:39
up vote 1 down vote accepted

I suppose what you want is achievable with . And if your modem creates a virtual com port(quite possible) then you could use program to sniff RS232 like

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