Hi Christian,
When I search in the Mendix appstore, the only thing I find for telnet or SSH connections is the SFTP module. That surely not what you are looking for. I think you have to build it your own creating a custom Java Action. You can find more on that topic by searching on “custom java”.
2 questions to check:
- Isn't there another type of connection possible using a more generic protocol, like a REST call?
- Are you sure the printer is reachable from the network you will host the Mendix app on? (as most of the Mendix apps run in the public cloud)
Regards,
Johan