To block telnet commands on the Smart printers , connect the Telnet and command '/etc/init.d/telnetd stop' in the user script.
Then that Ethernet module doesn't serve the telnet communication.
To connect the telnet service of network module for SMART printer, please type the command as below. (refer to attached pictures.)
> telnet xxx.xxx.xxx 223 ; 223 is the port number for telnet service
> ID: root / Password: smartnetadmin
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