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 ...

09/10/2026

Dolby Expands Dolby OptiView Platform with New Capabilities at IBC 2026

September 10 2026, 06:00 (PDT) Dolby Expands Dolby OptiView Platform with New Capabilities at IBC 2026 New Sports Intelligence helps providers better unders...

07/10/2026

Dalet Flex LTS Delivers Smarter Media Operations from Ingest to Distribution

Dalet, a leading technology and service provider for media-rich organizations, today announced the latest Long-Term Supported (LTS) release of Dalet Flex. Build...

29/09/2026

Fubo TV Launches My Local Sports'

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

ARRI Targets Content Creators with New HONOR Smartphone

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

Asian News International Enhances Workflow with Grass Valley AMPP, FramelightX

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

SABC Chooses Ikegami UHK-X600 Cameras to Support IP Studio Transition

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

SABC Upgrades to IP-Based Production with Ikegami UHK-X60...

Ikegami announces that the South African Broadcasting Corporation, SABC, has chosen Ikegami UHK-X600 camera systems as part of an advance to IP-based operation ...

29/09/2026

Blendkit Offers 20% Discount to Celebrate Crossing 150K Asset Milestone

Blendkit Offers 20% Discount to Celebrate Crossing 150K Asset Milestone Brie Clayton September 29, 2026 0 Comments Blendkit, the largest 3D asset libr...

29/09/2026

Ease Live Reports over 75 Million Interactive Sessions Du...

Interactive streaming specialist Ease Live supported more than 76.5 million fan sessions across three major European media operators during this summers FIFA Wo...

29/09/2026

Ease Live to monetise key moments in live sports

Ease Live has added support for VAST (Video Ad Serving Template) to its graphical overlay technology, opening up new ways for broadcasters, streamers and rights...

29/09/2026

Rise AV launches awards celebrating the women advocates a...

Rise AV has announced the launch of the inaugural Rise AV Awards, a new global awards programme celebrating the women, advocates and organisations across the AV...

29/09/2026

Netflix Deploys Advanced Sony PTZ Cameras For Wonka's The Golden Ticket' Production

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

Massachusetts Broadcasters Association Names Gene Lavanchy 2026 Broadcaster of the Year

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

ESPN Reports Its Most-Watched WNBA Regular Season

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

Scripps Taps Digital News Veteran Sean McGarvy to Lead News Strategy

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

Gray Raises Political Ad Revenue Estimates

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

Edward Czarnecki Uses Game Theory to Assess ATSC 3.0 Transition Policies

Share Copy link Facebook X Linkedin Bluesky Email...

29/09/2026

First Baptist Nashville Drastically Upgrades Production C...

Clear-Com announced that First Baptist Nashville has upgraded its production communications with a Clear-Com intercom solution as part of a comprehensive sanct...

29/09/2026

Blackmagic Cinema Camera 6K Captured Action Shots for Sketch

Blackmagic Cinema Camera 6K Captured Action Shots for Sketch Brie Clayton September 28, 2026 0 Comments Camera's portable design and dynamic range...

29/09/2026

Kean Production Services Deploys AJA ColorBox to Deliver Consistent, Accurate Color Across In-venue Displays at Live Events

Kean Production Services Deploys AJA ColorBox to Deliver Consistent, Accurate Co...

29/09/2026

Berklee Alumni and Faculty Nominated for the 2026 Latin Grammy Awards

Berklee Alumni and Faculty Nominated for the 2026 Latin Grammy Awards A total of 28 Berklee alumni and faculty earned nominations across 20 categories this ye...

29/09/2026

Berklee's K-Pop & Beyond Explores Connections Between K-Pop and Hip-Hop

Berklee's K-Pop & Beyond Explores Connections Between K-Pop and Hip-Hop Now in its fifth year, the series brings together artists, industry leaders, and s...

29/09/2026

RT lyric fm launch the hunt for Choirs for Christmas

RT lyric fm is proud to announce the annual Choirs for Christmas competition callout. Warm up those vocal chords and join us on RT lyric fm for a celebration ...

28/09/2026

NHL Names Adobe as an Official Creative, Marketing and AI Partner

The NHL has announced Adobe as an Official Creative, Marketing and AI Partner beginning with the 2026-27 season. The partnership will provide the league and its...

28/09/2026

MultiDyne to Showcase Expanded Portfolio Including MRMC Robotics at CABSAT 2026

MultiDyne will exhibit at CABSAT 2026 (October 5-7, Dubai Exhibition Centre), showcasing an expanded technology portfolio following its June 2026 acquisition of...

28/09/2026

ARRI and HONOR Launch Co-Branded HONOR Magic9 Pro Max

ARRI and HONOR have announced the HONOR Magic9 Pro Max, a flagship smartphone carrying ARRI branding on the device and packaging as the first product-level expr...

28/09/2026

Net Insight Adds Nimbra 1020G to Pan-Asian Live Media Trial Network

Net Insight has added the Nimbra 1020G to its pan-Asian live media trial network, giving customers and partners in the region a way to evaluate ST 2110 and JPEG...

28/09/2026

Vindral Named Recipient of 2026 Technology and Engineering Emmy Award

Vindral has been named a recipient of a 2026 Technology and Engineering Emmy Award by the National Academy of Television Arts and Sciences in the category of We...

28/09/2026

Interra Systems to Demonstrate QC and Monitoring Portfolio at CABSAT 2026

Interra Systems will exhibit at CABSAT 2026 (Stand B2-37, Dubai Exhibition Centre, October 5-7), demonstrating its BATON QC platform, ORION monitoring solutions...

28/09/2026

PGA TOUR's Michael Raimondo on Agentic Production, ShotLink Automation, and the Evolution of PGA TOUR Studios

Two years into its new production facility, the TOUR is expanding centralized wo...

28/09/2026

Game Creek Videos Epic Building Run Continues With ESPNs Countdown Unit, Upgrades to Four Others

In addition to rolling out a new mobile unit for ESPN's Monday Night Countd...

28/09/2026

Bleacher Report and WWE Reach Multi-Year Global Content Partnership

Bleacher Report and WWE have announced a multi-year content partnership giving Bleacher Report global highlight rights across WWE's programming slate, inclu...

28/09/2026

Behind The Mic: NBC Sports Shares MLB Wild Card Series Announcing Booth; ESPN Reveals NHL 26-27 Season Talent

Behind The Mic provides a roundup of recent news regarding on-air talent, includ...

28/09/2026

Fubo Adds Four NHL Regional Sports Networks for 2026-27 Season

FuboTV has announced a multi-year distribution agreement with the NHL to carry four regional sports networks covering the Carolina Hurricanes, Columbus Blue Jac...

28/09/2026

Program Productions Names Alan Ostfield President and CEO

Program Productions (PPI) has announced the appointment of Alan Ostfield as President and Chief Executive Officer, effective September 28, 2026. Ostfield succee...

28/09/2026

Ha-chan, Shake Your Booty! Encourages Us to Keep Dancing

Director Josef Kubota Wladyka attends the premiere of Ha-Chan, Shake Your Booty! with the film's cast and crew at Eccles Theatre on January 22, 2026, in P...

28/09/2026

Scaler Music introduce Scaler EQ Pro

EQ plug-in can now be played via MIDI Scaler Music have recently released a new and improved version of their patented musical EQ plug-in, kitting it out wi...

28/09/2026

The Asura from Animal Factory Amps

New synth developed in collaboration with philterSoup Boutique effects pedal and Eurorack manufacturer Animal Factory Amps have announced that the new compa...

28/09/2026

Rohde & Schwarz adds an integrated multi-channel pulse analysis option to its FSWX signal and spectrum analyzer

Rohde & Schwarz adds an integrated multi-channel pulse analysis option to its FS...

28/09/2026

SBE Announces 2026 Ennes Scholarship Recipients

Share Copy link Facebook X Linkedin Bluesky Email...

28/09/2026

Spectrum to Demo AI Computing at the Network's Edge at SCTE TechExpo 26

Share Copy link Facebook X Linkedin Bluesky Email...

28/09/2026

Autoscript launches new Voice Controller prompting soluti...

Autoscript, the leading global provider of professional teleprompting solutions, today announced Voice Controller for WinPlus-IP, a new voice-controlled prompti...

28/09/2026

IBC 2026 Technical Conference Highlights

IBC 2026 Technical Conference Highlights David Kirk September 28, 2026 0 Comments Hero image courtesy Deposit Photos David Kirk reports from the 11-1...

28/09/2026

First Baptist Nashville Taps Clear-Com for Production Coms

Share Copy link Facebook X Linkedin Bluesky Email...

28/09/2026

IEEE Announces Award for Leadership in Developing HEVC/H.265

Share Copy link Facebook X Linkedin Bluesky Email...

28/09/2026

Nakadi Introduces Live to Theater Service Powered by Pate...

Nakadi, a global streaming technology innovator dedicated to engineering a new era of digital media delivery, today announced its Live to Theater service based ...

28/09/2026

Sky launches Full Fibre 1.6 Gbps for millions of homes

Monday 28 September 2026 Sky launches Full Fibre 1.6 Gbps for millions of homes Sky has launched a new Full Fibre 1.6 Gbps product, rolling out from today, gi...

28/09/2026

Arvato Systems Highlights Its Role for Automakers and Suppliers

Arvato Systems Highlights It's Role for Automotive Manufacturers and Suppliers TISAX Arvato Systems has successfully completed the TISAX Level 3 assess...

28/09/2026

Crimecall returns for a brand-new series

Crimecall, presented by Carla O'Brien, returns tonight for a brand new series at 9.35pm on RT One and RT Player. In tonight's episode, alongside appe...