
Applicable Products Part number Description
ZETA-GEP-LTE4 (EU) Low Power LTE Cat 4 European Modem with GPIO and GNSS
ZETA-G-GPRS Entry Level GPRS Modem with GNSS (GL)
ZETA-N2-GPRS Entry Level GPRS Modem (GL)
ZETA-NEP-LTE4 (EU) Low Power LTE Cat 4 European Modem with GPIO
ZETA-NEP-LTEM (GL) Low Power Global LTE Cat M Modem with GPIO
ZETA-NLP-LTE1 (EU) Ultra Low Power European LTE Cat 1 Modem
ZETA-NLP-LTEM (GL) Ultra Low Power Global LTE Cat M Modem
ZETA-N-LTE (EU) High Performance LTE Cat 4 Modem with GPIO
ZETA-NSP-LTE1 (EU) Low Power European LTE Cat 1 Modem
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 The dialling device can use any standard SIM card and does not require a specific setup or fixed IP address SIM card. As the dialling device is dialling out to the server it is not listening for incoming data connections and therefore does not need to be as concerned about security as the listening device.
Demonstration of Solution Resources:
PC with an installed Terminal Emulator' program: A Windows 10 laptop installed with Tera Term was used for the purpose of this guide.
Siretta Part Number: 61057 -ZETA-GEP-LTE4 (EU) Starter Kit (any ZETA starter Kit is suitable for this application)
Insert SIM card to the modem
Power on the modem
Connect the supplied serial port cable to the PC
Connect the antenna
As described in the Starter Kit Quick Start Guide
Open Hyperterminal on the PC (or your preferred terminal emulator: PuTTY, TeraTerm).
Select new connection. Name the new connection for reference in the future.
Name your port.
Choose the correct COM port. From the drop-down list, select the correct COM port your modem is connected to.
Configure the port with the following settings (These settings are standard for all of the ZETA Siretta modems):
Bits per second: 115200
Data bits: 8
Parity: None
Stop bits: 1
Flow control: Hardware
Note: The above procedure is set out in Initial Modem Set Up application note
GPRS Connection COM3 - Tera Term VT
File Edit Setup Control Window Help
//Set extended error messages
AT CMEE=2
//Set GPRS APN Name
AT CGDCONT=1, IP , APN Name
Outgoing Connection COM3 - Tera Term VT
File Edit Setup Control Window Help
//Set packet size and timeouts on context 1-6
AT#SCFG=1,1,300,90,600,50
//Open GPRS context 1-6 with GPRS Username and GPRS Password. (This will return your ISP assigned IP address)
AT#SGACT=1,1, username , password
//Open Socket on Port Number at IP Address
AT#SD=1,0, Port Number, IP Address ,255,0
// Close GPRS context 1-6
AT#SGACT=1,0
AT CGDCONT=1, IP , APN Name
AT#SGACT=1,1, username , password
AT#SD=1,0,1024, 080.080.080.081 ,255,0
Incoming Connection COM3 - Tera Term VT
File Edit Setup Control Window Help
//Open GPRS context 1-6 with GPRS Username and GPRS Password
AT#SGACT=1,1, username , password
//Setup Firewall
AT#FRWL=1, IP Address , Subnet Mask
Most recent headlines
05/01/2027
Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be ...
07/10/2026
Dalet, a leading technology and service provider for media-rich organizations, today announced the latest Long-Term Supported (LTS) release of Dalet Flex. Build...
06/09/2026
June 9 2026, 23:00 (PDT) Dolby and MagentaTV Bring Fans Closer to the FIFA Worl...
04/08/2026
Dalet, a leading technology and service provider for media-rich organizations, t...
23/07/2026
Staines-upon-Thames, UK, 23rd, JULY, 2026 - Yospace, the trusted leader in Dynamic Ad Insertion (DAI), stitched 11.57 billion one-to-one addressable advertisem...
23/07/2026
This Spring 2026 graduate from Honolulu found a home at SoonerVision as a live-production star and is ready to enter the industry as a replay op on Prime Video&...
23/07/2026
As the AUSL postseason begins tonight, listening in to players during games enhances fan engagement for the young organization
Ballplayers chatting with announ...
23/07/2026
Snap Inc. and the Esports Foundation have announced Snap's activations at the Esports World Cup 2026 in Paris, running July 6 through August 23. For the fir...
23/07/2026
Sony has announced the FX5, a full-frame Cinema Line camera built around a newly developed fully stacked Exmor RS CMOS image sensor and BIONZ XR2 image processi...
23/07/2026
TNDV (a division of Live Media Group) provided technical production support for the Pickleball Slam 4 live broadcast from Seminole Hard Rock Live in Hollywood, ...
23/07/2026
LTN has announced it has completed satellite-to-IP migrations for more than 3,00...
23/07/2026
Daktronics has announced the winners of the 2026 DakClassroom Student Showcase, a national competition recognizing student work in media production, storytellin...
23/07/2026
The French Tennis Federation (FFT) and beIN Media Group have announced a five-ye...
23/07/2026
Clear-Com provided the communications infrastructure for the Fryderyk Awards Gal...
23/07/2026
The 2026 FIFA World Cup is, on paper, an unparalleled financial success. Total t...
23/07/2026
Standing inside HQ3 at MediaCity Studios during the FIFA World Cup 2026, it quic...
23/07/2026
Having attracted upwards of 17 billion views throughout the tourney, the broadca...
23/07/2026
Quickly creates reverse reverb effects
Low End Candy have recently released a new plug-in that offers a quick and simple way to create reverse reverb effect...
23/07/2026
New engines, resonators, effects & more
Expressive E's versatile soft synth has just been treated to an update that greatly expands its sonic range. Noi...
23/07/2026
SGL Carbon has further expanded its photovoltaic capacity at its Ort im Innkreis site in Austria. With the commissioning of new PV carports, the sites solar sys...
23/07/2026
NITV launches new By Mob For Mob series in partnership with NRMA Insurance
23 July, 2026
Media releases
National Indigenous Television (NITV) has launched ...
23/07/2026
Rohde & Schwarz presents new software for three-phase power analysis on MXO seri...
23/07/2026
In our latest blog, Laura Rognoni explores how the launch of Play Snooker reflects a wider shift in sports economics - from monetising peak broadcast audiences ...
23/07/2026
Download Now!
To receive a short case study showcasing Vivid Broadcast's audio setup, please enter the following details:
--
First Name* First Name ...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
Witbe brings its AI-native testing and monitoring infrastructure to Amsterdam: demonstrations on real devices, a peer-reviewed technical paper in the conference...
23/07/2026
Quickplay, Caretta Research, Evergent, and Yospace have announced that the renowned IBC Pride Happy Hour will once again bring the vibe and fun back to IBC on F...
23/07/2026
At IBC2026, Interra Systems will present this year's focus: operational AI at scale for QC, monitoring, and captioning workflows. The industry has moved pas...
23/07/2026
Illusionfx is finally coming!
Alex Perea July 23, 2026
0 Comments
The new website is now live to mark the occasion.
Since the last update, feedback h...
23/07/2026
Evergent (5.A86) will showcase its Agentic Revenue Orchestration Platform for streaming services, sports leagues, pay-TV operators at IBC2026 (RAI Amsterdam, 11...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
23/07/2026
David Dvir, 2D founder (left), Sundeep Reddy (center), and Jean-Marc Bouchut (right), both of Zeiss...
23/07/2026
Screen Australia announces new national documentary accelerator program 23 July 2026
Screen Australia has today announced the Above the Line Documentary Accel...
23/07/2026
X-Rite Pantone and Fashion Institute of Technology (FIT) Partner to Advance Digi...
23/07/2026
Thursday 23 July 2026
New Samsung Galaxy Foldable range available now to pre-order on Sky Mobile
Sky Mobile, the award-winning network voted this year by Expe...
23/07/2026
Thursday 23 July 2026
Jason Statham leads Sky Original action thriller MUTINY in explosive new trailerTurn on cookies to view this content. Go to Privacy optio...
23/07/2026
Wuppertal July 23, 2026
Riedel Implements RefCam and Easy5G for the First Time...
23/07/2026
RT Commercial has today announced Centra as the official food partner once again of The Traitors Ireland, coming to RT One and RT Player later this year.
Ce...
23/07/2026
RT Commercial today announced Honda as sponsor of Today with David McCullagh RT Radio 1, weekdays 9am 11am.
Broadcasting directly after Morning Ireland in ...
23/07/2026
RT News is pleased to announce Barry Gallagher has been assigned as the new journalist covering news from Cork, Kerry and the wider Southern region
Working al...
23/07/2026
Lock in and load up the cloud. GFN Thursday brings fresh updates and new adventu...
22/07/2026
Among other tweaks to coverage, the broadcaster added announce positions in the ...
22/07/2026
The Australian Sports Technologies Network (ASTN) has reported a sharp acceleration in Australia's sportstech sector, with revenue growth rising from 10% in...
22/07/2026
From a retrofitted broadcast bus to packed Match Day Live! events, Bennett detai...
22/07/2026
TMRW Sports has named Brendan Donohue as President, Flag Football, where he will lead the company's professional flag football business in partnership with ...
22/07/2026
Stephen Arnold Music (SAM) designed and produced soundtracks for nine projection...