Why can I not receive a response from a TCP/IP capable printer?

Question

My ultimate goal is to send a print job to a printer over the internet. The catch is that the printer is connected directly to a router, so I can\'t count on a computer proc

Answer 1

The port you opened is likely the raw data dump port for the printer. Likely there is a seperate port which speaks RFC1179 that will speak to your lpr client.

You should not be sending HTTP control to either of these ports.