
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 ...
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...
10/07/2026
In-venue and creative video staffers at the professional and collegiate level ha...
10/07/2026
FUJIFILM North America Corporation has announced the FUJINON GF19-35mmT3.5 PZ OIS WR, a cinema power zoom lens for the GFX System with native G Mount. The lens ...
10/07/2026
Dalet has announced a new Long-Term Supported (LTS) release of Dalet Flex, expanding AI capabilities, workflow automation, and integration with Dalia, Dalet'...
10/07/2026
Blackmagic Design has released Fairlight Live, a free software-based broadcast audio mixer for Mac and Windows, available for download now. Simultaneously, the ...
10/07/2026
FloSports and the USA South Athletic Conference have announced an exclusive medi...
10/07/2026
Daktronics has manufactured and installed an LED video display at Field of Dream...
10/07/2026
Registration is now open for NAB Show New York 2026, taking place October 21-22 ...
10/07/2026
Sphere Entertainment Co. and the Formula 1 Heineken Las Vegas Grand Prix have an...
10/07/2026
CBS Sports and the Asian Football Confederation (AFC) have announced a media rights partnership covering the AFC Asian Cup Saudi Arabia 2027 and the AFC U23 Asi...
10/07/2026
Sony Electronics has announced the RX10 V, the fifth generation of its RX10 all-in-one camera series. The camera will be available in August 2026 at a suggested...
10/07/2026
Chyron has announced PRIME 5.4, an update to its unified graphics, playout, and ...
10/07/2026
The nine-time Emmy Award-winning video engineer was a pioneer of NASCAR in-car cameras and a longtime fixture in FOX Sports' video-control operation...
10/07/2026
FuboTV Inc. has announced the appointment of Alisa Bowen as Chief Executive Officer, effective July 10. Bowen succeeds David Gandler, who co-founded the company...
10/07/2026
Every entry on Nielsen's Top 25 Live Sports Events Telecasts for the week of...
10/07/2026
The Braves opted to keep production in-house rather than hand it off to MLB...
10/07/2026
Drones, jibs, robos are part of the expanded camera complement for the Professional Bull Riders series
PBR Teams' 2026 season, with a 10-team field competi...
10/07/2026
(L-R) Michael Arndt, Paul Dano, Toni Collette, Valerie Faris, Abigail Breslin, Jonathan Dayton, and Greg Kinnear attend the Park City Legacy program screening o...
10/07/2026
Discounted rates available through 27 August 2026
The Audio Engineering Society (AES) have announced that Early Bird registration is now open for the AES Sh...
10/07/2026
New in-ear monitors to launch in August 2026
Sony have announced the upcoming launch of a new pair of in-ear monitors that promise to deliver a secure, stab...
10/07/2026
Why CRAS Upgraded to Symphony I/O MK II When an audio school runs studios all day, every day, gear doesn't just need to sound good , it needs to survive rea...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Hey Man, Cheech & Chong's Last Movie Rolls With SNS EVO
Melanie Ciotti July 10, 2026
0 Comments
Richard Cheech Marin and Tommy Chong have long b...
10/07/2026
Alex Zarfati's Fail Safe Shot with Blackmagic PYXIS 12K
Brie Clayton July 10, 2026
0 Comments
Camera's full frame sensor supports anamorphic s...
10/07/2026
Dalet, a leading technology and service provider for media-rich organizations, today announced the latest Long-Term Supported (LTS) release of Dalet Flex. Build...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
10/07/2026
New RT documentary explores Irish-led efforts to build bridges in divided Cyprus
More than a Game: From D1 to Pyla airs Monday 13 July
More Than a Game: Fro...
09/07/2026
With 50+ cameras, three trucks, 60+ EVS channels, RFID hole-card workflows, and ...
09/07/2026
A recent graduate from Westchester, NY, this experienced technician has already started her first gig in the industry, as a REMI A2 Comms Specialist at ESPN
In...
09/07/2026
Live sports production is a fast-paced industry with no signs of slowing down. W...
09/07/2026
From a rooftop studio in Manhattan, multiple Germany-based companies share respo...
09/07/2026
Overtime has announced a content partnership with FOX One to produce Race to Glo...
09/07/2026
Clear-Com has announced that Ross Production Services (RPS) has standardized on ...
09/07/2026
The NFL has announced that NetApp will return as Presenting Partner of the NFL Madrid Game, featuring the Atlanta Falcons against the Cincinnati Bengals at the ...
09/07/2026
The R&A and Cisco have announced a multi-year partnership making Cisco the Official Network Supplier of The R&A and its Championships. Cisco will deploy AI-read...
09/07/2026
Fox Television Stations, Extreme Reach (XR), and LTN have announced the completi...
09/07/2026
Kiswe has announced a partnership with Wynn Records to launch the Wynn Records Network streaming platform, debuting Saturday, July 11 with a Salita Promotions b...
09/07/2026
NEP Europe has announced a new multi-year agreement with Wimbledon Broadcast Ser...
09/07/2026
Thropic Games, a company offering casual mobile games tied to fan fundraising for sports programs, has announced a pre-seed funding round led by The Famous Grou...
09/07/2026
Game Creek Video has reached an agreement with Grass Valley to purchase 10 K-Frame production switchers as part of a two-year fleet expansion. Two systems have ...
09/07/2026
Gravity Media is delivering a three-hub remote production workflow for ITV's...
09/07/2026
A new report from Quickplay and Caretta Research, The Broadcaster Revolution Wi...
09/07/2026
DAZN, the world's leading sports entertainment platform, has announced a long-term strategic partnership with the Esports World Cup Foundation to serve as t...