Installation guide

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trigger={always|data|dcd|dsr|string}
Indicates which events from the serial port will trigger a network
connection to occur.
always
The serial port will continually attempt to keep a connection to a
remote network destination active.
data
The serial port will attempt a network connection whenever data
arrives on the serial port.
dcd
The serial port will attempt a network connection whenever the serial
port’s DCD signal goes high.
dsr
The serial port will attempt a network connection whenever the serial
port’s DSR signal goes high.
string
A connection will be made upon detecting a particular sting,
specified by the “connect_on_string” option, in the data from the
serial port.
The default is “always.”
service={raw|rlogin|ssl|telnet|ssh}
The type of network connection that will be established.
raw
A connection without any special processing will occur.
rlogin
A remote login (rlogin) connection will occur.
ssl
A secure connection conforming to SSL (Secure Sockets Layer) Version 3
and Transport Layer Security (TLS) Version 1 will occur.
telnet
A connection with Telnet processing will occur.
ssh
A SSH(Secure Shell) connection will occur. The default is “raw.”
description=string
A name for descriptive purposes only.