Sony Pixel Power calrec Sony

Incoming and Outgoing Data Socket Connection using a Siretta Modem

27/03/2025

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
LINK: https://www.siretta.com/2025/03/incoming-and-outgoing-data-socket-conn...
See more stories from sequoia

Most recent headlines

05/01/2027

Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be demoed at CES 2026

Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be ...

01/06/2026

Dolby Sets the New Standard for Premium Entertainment at CES 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...

01/05/2026

NBCUniversal's Peacock to Be First Streamer to Integrate Dolby's Full Suite of Premium Picture and Sound Innovations

January 5 2026, 18:30 (PST) NBCUniversal's Peacock to Be First Streamer to ...

01/04/2026

DOLBY AND DOUYIN EMPOWER THE NEXT GENERATON OF CREATORS WITH DOLBY VISION

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...

10/01/2026

Give Me the Backstory: Get to Know Cherien Dabis, the Filmmaker Behind All That's Left of You ( )

By Bailey Pennick One of the most exciting things about the Sundance Film Festi...

10/01/2026

Golden Week Nominees Night Celebrates a Podcasting Milestone

This year, podcasts are making their Golden Globes debut with a new category honoring the medium's leading shows and creators. To mark the occasion, Spotify...

10/01/2026

ESPN Reports Near-Record Viewing for Start of NBA Season

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

10/01/2026

Connection and Youth Defined: 'The Ramparts of Ice' Brings a Heartwarming Story of Friendship to Netflix this April

Back to All News Connection and Youth Defined: The Ramparts of Ice Brings a Hea...

09/01/2026

Rock-It Sports' Deron Brown & Laura Rowlands on Launching a New Brand, Supplying Logistical Needs for Events in 2026

Rock-It Sports' Deron Brown & Laura Rowlands on Launching a New Brand, Suppl...

09/01/2026

Warner Bros. Discovery's Chris Brown on the Broadcaster's First French Open, Advancing Remote Workflows at Techwood Facility

Warner Bros. Discovery's Chris Brown on the Broadcaster's First French O...

09/01/2026

NFL Playoffs 2026: CBS Sports Travels to Jacksonville With Packed Arsenal of Production Capabilities

NFL Playoffs 2026: CBS Sports Travels to Jacksonville With Packed Arsenal of Pro...

09/01/2026

NFL Playoffs 2026: NBC Sports Is Set To Roll Out New Scorebar, Insert Graphics This Weekend

NFL Playoffs 2026: NBC Sports Is Set To Roll Out New Scorebar, Insert Graphics T...

09/01/2026

NFL Playoffs 2026: Prime Video Production Team Caps Historic Season With Iconic Bears-Packers Primetime Matchup in Chicago

NFL Playoffs 2026: Prime Video Production Team Caps Historic Season With Iconic ...

09/01/2026

NFL Playoffs 2026: FOX Sports Kicks Off Postseason Slate With Two-Game Wild Card Coverage

NFL Playoffs 2026: FOX Sports Kicks Off Postseason Slate With Two-Game Wild Card...

09/01/2026

NFL Playoffs 2026: ESPN's Run Brings Monday Night Football' Flagship Operation Into January

NFL Playoffs 2026: ESPN's Run Brings Monday Night Football' Flagship Op...

09/01/2026

Carr: FCC Looking for Ways to Empower' Local Broadcasters

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

Panasonic to Introduce Projection, LED and Workflow Offerings at ISE 2026

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

SMPTE Announces 2026 Leadership

SMPTE , the home of media professionals, technologists, and engineers, today introduced the board officers and regional governors who will serve terms beginning...

09/01/2026

Globecast Appoints Chris Pulis as Group Chief Technology...

Globecast, the leading provider of broadcast, media and entertainment managed services, today announced the appointment of Chris Pulis as Group Chief Technology...

09/01/2026

Hollywood Professional Association Announces Updates to B...

The Hollywood Professional Association (HPA) today announced several updates to its board of directors. As part of HPA s annual governance cycle, new leadership...

09/01/2026

SDVI APPOINTS SIMON ELDRIDGE AS CHIEF OPERATING OFFICER

SDVI, the leading platform provider for cloud-native media supply chains, today announced that Simon Eldridge has been appointed chief operating officer. In thi...

09/01/2026

Cobalt Digital Returns to ISE with Comprehensive Lineup o...

Cobalt Digital, the leading designer and manufacturer of award-winning ST 2110 and SDI signal processing products, and a founding partner in the openGear initi...

09/01/2026

iWedia Strengthens Leadership in ATSC 3-0 with Market-Pro...

iWedia, a global leader in connected TV software solutions, announces that its market-proven ATSC 3.0 software stack is powering the broadcast functionality of ...

09/01/2026

Amino and Xibo Partner to Deliver Next Generation 4K Digi...

Amino, a global leader in enterprise video and digital signage technology, today announced a strategic partnership with Xibo, a leading global digital signage s...

09/01/2026

FIFA Strikes Content Deal with TikTok for 2026 World Cup

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

HPA Elects New Officers, Board Members for 2026

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

NFL's 2025-26 Regular Season Is Second-Most-Watched Ever

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

FCC Sets Tentative Agenda for Jan. 29 Open Meeting

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

Carr: FCC Looking for Ways to 'Empower' Local Broadcasters

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

09/01/2026

RT delivers another record year in 2025, bringing Ireland together with national moments

RT Player has 157 million streams, up 10% year-on-year An increase on 2024, RT...

09/01/2026

2FM announces line-up of Rising Artists for 2026

RT 2FM has today announced the highly anticipated list of 2FM Rising Artists for 2026, kicking off 2FM Rising week for the eighth year on The Tracy Clifford Sh...

09/01/2026

RT to Host the 2026 RTS Ireland Awards

RT to Host the 2026 RTS Ireland Awards Thursday, 16 April 2026 | Dublin Royal Convention Centre The RTS Ireland Television Awards 2026 | Gradaim RTS 2026 | R...

09/01/2026

NVIDIA Unveils Multi-Agent Intelligent Warehouse and Catalog Enrichment AI Blueprints to Power the Retail Pipeline

Every that was easy shopping moment is made possible by teams working to hit s...

08/01/2026

How disinformation is shaping Sudan's conflict: a new report

An evidence-based analysis on disinformation and information manipulation in Sudan's ongoing conflict is published today. (January 8th 2026). Thomson Found...

08/01/2026

At CFP Semifinals, ESPN Again Flexes Its Operational Muscle With 20+ MegaCast Viewing Options

At CFP Semifinals, ESPN Again Flexes Its Operational Muscle With 20+ MegaCast Vi...

08/01/2026

SVG Students To Watch: Sophie Fowler, University of Oregon

SVG Students To Watch: Sophie Fowler, University of OregonThe Portland product has honed her skills as a producer, director, and TD at Quack VideoBy Brandon Cos...

08/01/2026

Follow the Money, Episode 3: Inside the Sports-Media Biz With Sam McCleery and Ken Aagaard

Follow the Money, Episode 3: Inside the Sports-Media Biz With Sam McCleery and K...

08/01/2026

SVG New Sponsor Spotlight: Qualstar's Jeff Sengpiehl on the Enduring Power and Value of LTO Tape for Video Archiving

SVG New Sponsor Spotlight: Qualstar's Jeff Sengpiehl on the Enduring Power a...

08/01/2026

Legendary February: Production Leaders at NBC Sports Pull Back the Curtain on Olympics, Super Bowl, NBA All-Star Plans

Legendary February: Production Leaders at NBC Sports Pull Back the Curtain on Ol...

08/01/2026

One Year In: How Creators Are Growing Their Shows and Connecting With Audiences Through the Spotify Partner Program

In 2025 we launched the Spotify Partner Program to give creators more ways to tu...

08/01/2026

Spotify Toasts to the Future of Podcasting With Creators at Our New Sycamore Studios

On Wednesday in Los Angeles, Spotify welcomed creators and press to a brunch cel...

08/01/2026

Hollywood Professional Association (HPA) Announces Updates to Board of Directors

The Hollywood Professional Association (HPA) today announced several updates to its Board of Directors. As part of HPA's annual governance cycle, new leader...

08/01/2026

Chyron Releases Virtual Placement 8.0

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

08/01/2026

SMPTE Names Board Officers, Governors for 2026

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

08/01/2026

FCC to Vote on Proposals Expanding Unlicensed Use of 6 GHz Band

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

08/01/2026

RTVE selects Alfalite Neopix for its first broadcast depl...

Spain's national public broadcaster, RTVE, has upgraded one of its main television production facilities in Madrid with the installation of two Alfalite NEO...

08/01/2026

Richard E. Wiley to Step Down as Media Institute's Chairman

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

08/01/2026

Cineverse Acquires Giant Worldwide

Share Share by: Copy link Facebook X Whatsapp Pinterest Flipboard...

08/01/2026

Maxon Introduces Cinebench 2026

Maxon's new release of Cinebench features performance enhancements and adds support for the latest Nvidia and AMD GPUs as well as Apple Silicon. Maxon is t...

08/01/2026

Zixi Accelerates Global Growth with Appointment of Heathe...

Zixi, the industry leader in IP-based video transport and orchestration, today announced the appointment of Heather Mellish as Vice President, Global Sales. In...