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document telnet timeout, closes #197

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Thorsten von Eicken 8 years ago
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      README.md

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README.md
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@ -152,6 +152,12 @@ From there, more advanced steps are:
In order to connect through the esp-link to a microcontroller use port 23. For example, In order to connect through the esp-link to a microcontroller use port 23. For example,
on linux you can use `nc esp-hostname 23` or `telnet esp-hostname 23`. on linux you can use `nc esp-hostname 23` or `telnet esp-hostname 23`.
The connections on port 23 and 2323 have a 5 minute inactivity timeout. This is standard with
Espressif's SDK and esp-link does not change it. The reason is that due to memory limitations only a
few connections can be open (4 per port) and it's easy for connections to get "lost" staying open
forever, for example, due to wifi disconnects. That could easily make it impossible to connect to
esp-link due to connection exhaustion. Something smarter is most likely possible...
Note that multiple connections to port 23 and 2323 can be made simultaneously. Esp-link will Note that multiple connections to port 23 and 2323 can be made simultaneously. Esp-link will
intermix characters received on all these connections onto the serial TX and it will intermix characters received on all these connections onto the serial TX and it will
broadcast incoming characters from the serial RX to all connections. Use with caution! broadcast incoming characters from the serial RX to all connections. Use with caution!

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