Vaisala Hydromet Data Collection Platform - Manual (Page 330)

User's Guide ______________________________________________________________________
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IP Service Connectivity with GSM
In GSM networks, IP connections from the Internet to the cellular
terminals are often blocked by operator firewall, and terminals may
even be provided with private IP addresses. These restrictions make the
terminal devices inaccessible from the Internet when, for example,
establishing an IP service connection to AWS site is impossible.
A "wakeup" SMS can be used to trigger the logger to establish an IP
service connection via GSM terminal to a PC running AWS Client
software.
0906-058 Figure 167 Using SMS to Establish IP Service Connection
By default, the logger does not process incoming SMS. For instructions
on how to enable SMS handling, see section
SMS Handler on page 289 .
NOTE Restrictions are operator-dependent. Operators provide additional
services, such as private APNs, with different access and addressing
schemes.
NOTE To use this feature, the PC running the AWS Client software needs a
GSM modem for sending the SMS and a public IP address, either static
or dynamic DNS -hosted, for accepting the incoming connection.
Also, it is required that a port in the user organization firewall be
opened for the incoming connection to pass to the destination PC.