Yep, sure enough -- I got the idea to run a "telnet" server on my MBP this morning via nc -l <ip> 8888 and configure my driver to talk to that.
I tried sending the driver any old string, then tried Username: , and only once I sent the specific string login: did it send the username over the wire.
I'm wondering if perhaps there's an option for the prompt string that's been added since @bravenel made this post a couple of years ago.
What I have managed to do as a workaround is to login with null, null and immediately push the username and password onto the buffer, which does seem to get me logged in OK. I suspect, due to how telnet is supposed to work, this would generally be sufficient to login to all devices that read a username and password in that order.
