
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
Europe Stories
05/01/2027
Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be ...
01/06/2026
January 6 2026, 05:30 (PST) Dolby Sets the New Standard for Premium Entertainment at CES 2026
Throughout the week, Dolby brings to life the latest innovatio...
02/05/2026
Dalet, a leading technology and service provider for media-rich organizations, t...
01/05/2026
January 5 2026, 18:30 (PST) NBCUniversal's Peacock to Be First Streamer to ...
01/04/2026
January 4 2026, 18:00 (PST) DOLBY AND DOUYIN EMPOWER THE NEXT GENERATON OF CREATORS WITH DOLBY VISION
Douyin Users Can Now Create And Share Videos With Stun...
11/02/2026
Video moves fast can your DAM keep up?
Join Blue Lucy in LA for the West Coast's leading Digital Asset Management event as we explore, celebrate, and acc...
11/02/2026
Wednesday 11 February 2026
Sky brings together Netflix, Disney , HBO Max and Ha...
11/02/2026
At the end of January, ICG headed off to the Portuguese capital, Lisbon, for our annual conference.
An early flight gave us plenty of time to start exploring s...
11/02/2026
The intergalactic children's show starring Adam King will premiere on 14 February on RT 2, RT KIDSjr and RT Player
The Late Late Toy Show star Adam King...
10/02/2026
With a new film adaptation of Wuthering Heights arriving just in time for Valent...
10/02/2026
Today, we announced our fourth quarter 2025 earnings, marking a strong finish to the year with exceptional user growth and continued momentum across the busines...
10/02/2026
I dag redovisar vi v rt resultat f r fj rde kvartalet 2025, vilket markerar ett starkt avslut p ret med robust anv ndartillv xt och fortsatt momentum i hela v...
10/02/2026
eds3_5_jq(document).ready(function($) { $(#eds_sliderM519).chameleonSlider_2_1({ content_source:......
10/02/2026
10 Feb 2026
VEON's Kyivstar Expands Digital Healthcare Services in Ukraine ...
10/02/2026
The new TV campaign is set to air on Sky from 10th February - 6th April inviting...
10/02/2026
Red Seat Ventures Acquires Leading Podcast Subscription Platform Supercast Los Angeles, CA, February 10, 2026 - Red Seat Ventures, a division of Fox Corporati...
10/02/2026
Arvato Systems celebrates a decade of innovation and customer success in the dig...
09/02/2026
Book a meeting or demonstration at ISE 2026! Please enter the following details. (Tick the relevant box for a meeting or demo):
--
Meeting / Demo*
Meeting...
09/02/2026
From Green Day using 2028s, Charlie Puth's rendition of The Star-Spangled Banner with a d:facto (as well as 4099s on many of the instruments) and Bad Bunny...
09/02/2026
RT Investigates rapid rise in waiting list for the Central Mental Hospital
am...
08/02/2026
08 Feb 2026
VEON and JazzWorld Launch Invest in Pakistan, NOW! Inviting Inter...
06/02/2026
Music fans know the feeling: A song stops you in your tracks, and you immediately want to know more. What inspired it, and what's the meaning behind it? We ...
06/02/2026
Calrec Wins Best of Show at ISE 2026 for Orchestrating Distributed IP Production
Calrec is delighted to announce that its IP Ecosystem Powered by True Control...
06/02/2026
TV Highlights: Saturday February 7th - Friday February 13th
What can I watch on TV in the UK this week? What can I watch on U&GOLD? What can I stream on U thi...
06/02/2026
The Winter Olympics 2026 in Milano Cortina officially get underway this evening (Friday 6 February) with the Opening Ceremony live on RT Player and RT News ch...
05/02/2026
Since bringing audiobooks to Spotify in 2022, we've helped listeners discove...
05/02/2026
Today, Spotify announced two new updates to give book lovers a more personalized...
05/02/2026
AI should balance automation (replacing tasks) and augmentation (empowering humans). Automate the mundane and augment the creative by applying the right AI type...
05/02/2026
BBC Studios and UKTV have appointed Karin Marelle to lead their Global Acquisitions team, overseeing the sourcing of content across BBC Studios' global chan...
05/02/2026
Thursday 5 February 2026
The Miniature Wife, A Sky Exclusive comedy drama starr...
05/02/2026
Thursday 5 February 2026
Trailer Revealed for Sky Original Film FUZE starring A...
05/02/2026
Rohde & Schwarz at MWC Barcelona 2026: Enabling connections, empowering innovati...
04/02/2026
Lyrics are one of Spotify's most popular features, giving fans a richer way to experience the music and artists they love. They're viewed hundreds of mi...
04/02/2026
Wednesday 4 February 2026
Full cast announced for Saturday Night Live UK, comin...
04/02/2026
Wednesday 4 February 2026
Fear of running out of mobile data (FORO) is a real i...
04/02/2026
Rohde & Schwarz powers next generation television in Brazil with DTV technology...
04/02/2026
Fox Corporation Reports Second Quarter Fiscal 2026 Financial Results NEW YORK, NY, February 4, 2026 - Fox Corporation (Nasdaq: FOXA, FOX; FOX or the Compan...
04/02/2026
Lucas P. Arag n Joins FOX Advertising as Senior Vice President, Creative New York, NY - February 4, 2026 - Accomplished Creative Executive Lucas P. Arag n has...
04/02/2026
Following the passing of our friend and colleague Hugh Wallace, and with the full support of his family, RT will proceed with the broadcast of the new series o...
03/02/2026
Spotify's annual Best New Artist celebration returned to Los Angeles last ni...
03/02/2026
FoMa Antares: Redefining Camera Stabilization for Modern ProductionsIn high-end broadcast and cinematic environments, precision, reliability, and flexibility ar...
03/02/2026
03 Feb 2026
VEON Welcomes Expanded Kyivstar Free Float After the Successful Kyi...
03/02/2026
Mel Giedroyc fronts brand new comedy entertainment format
3rd February 2026, London: U and U&Dave is set to launch brand-new escape room comedy entertainment s...
03/02/2026
Tuesday 3 February 2026
Iconic TV channel Sky One is coming back as the new hom...
03/02/2026
Wuppertal February 3, 2026
Riedel Connects Live Surgery and Medical Professionals at VISAR 2025Turnkey Managed Technology Solution Featuring Riedel MediorNet,...
02/02/2026
February 2 2026, 20:30 (PST) Mahindra launches XUV 7XO as Indias first vehicle ...
02/02/2026
Ahead of the hotly anticipated return of Bergerac to U and U&DRAMA in the Spring, a teaser has been released to give viewers a glimpse at what's in store in...
02/02/2026
Rohde & Schwarz reshapes mid-range market with new 44 GHz FPL spectrum analyzer ...
02/02/2026
In addition to DPA Microphones, the company will also be acquiring Wisycom and Austrian Audio. The acquisition is now being filed for regulatory approval and sh...
02/02/2026
Arvato Systems launches a flexible and standardized billing solution
New SAP S/4HANA Utilities master system combines standardization, economies of scale, and...