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112
CHAPTER 3
Configuring the Gateway
Notification Sending
Secondary Server
Figure 109. SSH Tunnel - Secondary Server
A secondary SSH server can be used as alternative SSH tunnel, e.g.
if no connection to the primary SSH service can be established. An
alternative SSH service with identical or different host name can be
used for the secondary SSH server.
Note: In principle, a secondary SSH server is not necessary for a
SSH tunneling.
A notification is an event that is either created by a sensor of an
RTU changing its value (digital ports) or reaching a configured
threshold (analog ports), an RTU itself (depending on data delay
and radio error rates) or the Gateway (for some internal events like
rebooting, configuration changes, dialling into an ISP). These noti-
fications are queued and sent to the notification server.
The A850 supports sending notifications to servers using HTTP,
SMS and SMTP (E-Mail) over a primary and a secondary server for
each of these methods. The primary server is tried first, the sec-
ondary only when the primary server couldn't be contacted.
Note: To send notifications as SMS messages, an external GSM
modem must be connected to the A850!
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