SitePlayer Telnet User’s Manual
16
HTTP
- This is the http protocol which is used to communicate with SitePlayers web server.
Telnet
- This service is used to pass data between a network connection and the serial port.
Daytime
- This service is used to get the amount of elapsed time that SitePlayer has been run-
ning.
Discard
- This service throws away any data that is sent to it. Used mostly for speed testing.
UDP Serial
- This is a SitePlayer specific protocol which uses UDP to send and receive serial data.
The port values for Telnet and UDP Serial protocols will be used as source port values when SitePlayer is in
Client mode.
See
SitePlayer Services and Protocols
section for more details about the protocols and how to use them.
Change TCP Keep-Alive
You can enable and change various parameters which control SitePlayer’s keep-alive mechanism. The keep-
alive mechanism will terminate network connections if a computer is not reachable for a period of time. The
parameters which can be changed here are global and effect all SitePlayer TCP/IP protocols/services (i.e.
HTTP, Telnet, Daytime and Discard).
Normally TCP/IP connections are maintained indefinitely. This means that intermediate computers and rout-
ers can go down and come back up and TCP/IP will not care. This can cause problems in certain cases when
a computer connected to SitePlayer goes down. SitePlayer will maintain the connection to its service for the
computer because it has no way of knowing the computer has been shut down. Because a connection is still
maintained for a particular service, SitePlayer will not allow other computers to connect to that service.
To remedy this problem you can enable TCP Keep-Alive. You can fine tune the keep-alive mechanism by
altering various parameters
Idle Time
- specifies the amount of time in seconds to wait before sending a probe packet to
determine if the other end is still active. The default value of 7200 is 2 hours.
Retry Interval
- specifies the amount of time in seconds between successive probe packets. The
default is 9 seconds.
Retry Count
- specifies the number of times probe packets will be retried before the connection
is terminated. The default value is 75 times.
Set Extra Port
All SitePlayer services can be accessed at their default port numbers. The extra port value is a number which
is added to the default port number which allows SitePlayer to also be accessed at different port number.
For example, by default SitePlayer’s web pages can be accessed at port 80. The default extra port value of
47000 allows SitePlayer to also be accessed at port 47080. If you need to disable this feature, just set the
extra port value to 0.
The extra port value can be used, for example, in a NAT router to forward TCP/IP data in a certain port range
to a SitePlayer. You could set port 47080 to be forwarded to a SitePlayer on the local network while the NAT
router’s web page was externally accessible as port 80.
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Summary of Contents for SitePlayer Telnet Series
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