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External control user guide

March 27, 2015 Version 1.7.2.0 31

keepAlive command

Command

keepAlive

Shortcut

Arguments

seconds

Availability

when logged in

Purpose

Starts a watchdog timer, requiring the client to communicate within that

period or be disconnected. It is recommended that keepAlive be used to

ensure that TCP/IP client connections get closed in the face of network

failures (or even just unplugging and plugging in network connections). If

the network goes down and the client attempts to communicate, the client

will get a timeout and disconnect, reconnecting once the network is

restored. The server, however, would normally have no way of knowing

that the client gave up on its first connection and reconnected, so server

network stack resources consumed over time. keepAlive solves this

problem.

Notes

You can disable the watchdog timer with an argument of zero. This

command applies to TCP/IP only, not to the serial port.

Response

Something like this: keepAlive 10

Usage Example

The client issues:

keepAlive 120\r

ka 120\r

Response

keepAlive 120\r\n

Possible Error Messages

\aOverflow\r\n

\aBadArgumentCount\r\n

\anotLoggedIn\r\n

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MediaMatrix nControl Betriebsanweisung Seite 31