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Sending telnet options to remote server #3

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@and3rson

First of all - thank you for this awesome firmware, I'm currently using it in my 65C02-based single-board computer and it works great!

I'm currently thinking what would be the best way to pass Telnet options to the server. I wrote a simple terminal client, and I'm typing ATDT to connect to a remote Telnet server. My client program needs to know when the connection is open, so that it can send IAC codes, e. g.:

IAC WILL NAWS
IAC WILL ECHO
...

If I send them immediately on startup, they will be swallowed by WifiModem, because ATDT was not executed yet. How should my program identify when the connection is established, so that it can send all Telnet commands automatically? Can I rely on "CONNECT" message from the modem?

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