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80-001113 SysLINK Administrator’s Guide Page 52

Lightweight Heartbeat Settings

The Lightweight Heartbeat (LWHB) feature is designed to provide a low overhead method

for units to check in more frequently than existing SOUP methods. This is particularly useful

when used with cellular data plans that provide only a few MB of data per month. Full

SOUP updates can be scheduled at most every day and have relatively high overhead (20-

30Kbytes per update). SOUP heartbeats can be scheduled more often but still relatively high

overhead (5-6K per heartbeat). The LWHB allows units to:

 Check in frequently - providing an "I'm up" indicator

 Check to see if there are further actions that should take place - like a full SOUP

update

The LWHB server can record the source IP address which, in the cellular world can change

multiple times a day

LWHB does not use SSL. It connects to a server using either UDP or TCP (configurable) on a

configurable port number. The local IP port can also be configured if necessary to receive

replies from the server through a firewall.

Using UDB, each LWHB takes about 60 bytes. Using TCP, each LWHB takes about 650 bytes.

You must also take into account periodic DNS lookups for the hostname.

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Secure Computing ADMINGUIDEREVA Handbuch Seite 54