Three thoughts.

• Since this is all going over an unencrypted network session, you should be able to use a packet sniffer (like tcpdump or the GUI sniffer formerly known as Ethereal) to see exactly what is being sent. That should tell you definitively whether your script is sending the right thing or not.
• I'm not that familiar with Expect, but a quick look at the documentated method of sending control characters shows a different syntax than you are using. This syntax might be worth a try, even if the one you are using is also valid.
• Sometimes when sequences are meant to be sent by hand, they require a short pause before, after, or between the characters being sent (for example, many modems will do this with +++ to stop outgoing IP packets from sending a modem escape).

Good luck!

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