SIRETTA ZETA-GEP-LTE4 Quick Start Manual

Applicable Products
Part number
ZETA-GEP-LTE4 (EU)
ZETA-G-GPRS
ZETA-N2-GPRS
ZETA-NEP-LTE4 (EU)
ZETA-NEP-LTEM (GL)
ZETA-NLP-LTE1 (EU)
ZETA-NLP-LTEM (GL)
ZETA-N-LTE (EU)
ZETA-NSP-LTE1 (EU)
Objective
To connect embedded systems together using the internet requires the use of data sockets to send information from one location to another.
This process has been around for a long time and there are methods available to communicate with servers and devices using sockets to
establish a bi-directional communication link between two endpoints.
In general, there is a listening device and a dialling device. Servers are generally setup as listening devices and remote modems as dialling
devices, but this is not always the case and there are many examples which differ from this generalisation.
There are certain requirements with both the listening devices and dialling devices which must be taken into consideration when setting up a
communication link between two endpoints. This application note will discuss these points in more detail.
Solution
Listening Device Requirements
The listening device must be accessible on the network and be able to accept incoming data socket requests from remote devices. This usually
means having a firewall with a few specific open ports to allow incoming requests to be accepted through the accessible ports. Devices on the
internet which have open ports are immediately susceptible to attack from hackers, spammers, viruses and bots which exploit specific
vulnerabilities in the listening device's operating system. As a result, many security measures have been developed to prevent unauthorised
access, but care must be taken to ensure that these measures are effectively managed.
For a device listening on the internet, it would usually have a fixed IP address which does not change over time. This IP address can then be
used by any remote device to communicate with the listening device in a comparable way to a phone number is used on a telephone.
This fixed IP address would be publicly available and any device legitimate or otherwise would be able to communicate with it. On a HTTP
webserver, the server would have a fixed IP address and would be listening for incoming data traffic on port 80. Mapped to this IP address
would be a domain name such as 'www.example.com'. When the user types in 'www.example.com' to their web browser, the web browser
looks up the IP address using DNS and it returns the IP address of the server. The web browser then contacts the server's IP address directly
on port 80 and the https webserver responds with the web page.
The exact same process can be applied to data socket connections using mobile devices.
The mobile device uses a fixed IP address SIM card.
The mobile device is setup to listen on a specific port i.e. 1024.
The mobile device opens its firewall to specific devices.
The mobile device waits for an incoming data socket connection.
The dialling device attempts to open a socket on the IP address of the fixed IP address SIM card on the listening port i.e. 1024
Dialling Device Requirements
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Incoming and Outgoing Data Socket Connection using
Description
Low Power LTE Cat 4 European Modem with GPIO and GNSS
Entry Level GPRS Modem with GNSS (GL)
Entry Level GPRS Modem (GL)
Low Power LTE Cat 4 European Modem with GPIO
Low Power Global LTE Cat M Modem with GPIO
Ultra Low Power European LTE Cat 1 Modem
Ultra Low Power Global LTE Cat M Modem
High Performance LTE Cat 4 Modem with GPIO
Low Power European LTE Cat 1 Modem
a Siretta Modem
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