Request Time from the Network using GPRS

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

Demonstration of Solution Resources used for this application note are as follows:

ZETA-NEP-LTE4 (EU) modem (Low Power Modem with RS232 and USB serial): https://www.siretta.com/products/industrial-modems/lte-cat-4-mobile-network/enhanced-lte-cat-4-european-modem-with-gpio/

Modem Starter Kit Quick Start Guide: ZETA-xxP Quick Start Guide

Initial Modem Setup Guide Application Note: Initial Modem Setup Guide App Note - LP (siretta.com)

Data enabled SIM card.

A PC with an installed Terminal Emulator' program: Window 11 Laptop installed with Tera Term used for the purpose of this guide.

AT command reference manual: ZETA-xxP-LTE1 / ZETA-xxP-LTE4 AT Command https://pages.services/pages.siretta.com/zeta-xxp-lte1-zeta-xxp-lte4-at-command-reference-manual/?ts=1658149511127

Setup GPRS Connection Parameters 1. Set extended error messages by using at command below.

COM3 - Tera Term VT

File Edit Setup Control Window Help

AT CMEE=2

OK

2. Set GPRS APN Name by using at command below.

Outgoing Connection (Old Commands - No longer supported). 3. If the sim card requires username and password use below at commands otherwise continue with step 4.

COM3 - Tera Term VT

File Edit Setup Control Window Help

//Set GPRS Username

AT#USERID= APN username

//Set GPRS Password

AT#PASSW= APN password

4. Open GPRS context 1 by using below command.

Note: This will return your ISP assigned IP address as seen below.

COM3 - Tera Term VT

File Edit Setup Control Window Help

AT#GPRS=1

IP: 10.49.78.129

OK

5. Open Socket on Port Number at IP Address (Or URL) using below at command.

COM3 - Tera Term VT

File Edit Setup Control Window Help

AT#SKTD=0,80, www.siretta.com ,0,0

CONNECT

6. If successful, this will return CONNECT.

7. Set protocol using below command.

COM3 - Tera Term VT

File Edit Setup Control Window Help

GET /time.php HTTP/1.1

Host: www.siretta.com

HTTP/1.1 200 OK

Date: Tue, 20 Feb 2024 12:57:53 GMT

Content-Type: text/html; charset=UTF-8

Transfer-Encoding: chunked

Connection: keep-alive

Vary: Accept-Encoding

CF-Cache-Status: DYNAMIC

Report-To: { endpoints :[{ url : https:\/\/a.nel.cloudflare.com\/report\/v3?s=fL WGA3KZQXP%2BeD1hmWShzeGB0leN8w= }], group : cf-nel , max_age :604800}

NEL: { success_fraction :0, report_to : cf-nel , max_age :604800}

Server: cloudflare

CF-RAY: 8586eafdfb086627-AMS

alt-svc: h3= :443 ; ma=86400

18

#NITZ: 24/02/20,12:57:53

Outgoing Connection (New Commands) 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

OK

COM3 - Tera Term VT

File Edit Setup Control Window Help

//Open GPRS context 1-6 with APN username and APN password

AT#SGACT=1,1, APN Name , APN Password

//This will return your ISP assigned IP address

#SGACT: 10.188.232.13

OK

//Open Socket on Port Number at IP Address

AT#SD=1,0,80, www.siretta.com ,0,0

//If successful this will return CONNECT

CONNECT

//Set protocol

GET /time.php HTTP/1.1

//Request and query time script

Host: www.siretta.com

//If successful this will return #NITZ command as described in the AT manual

#NITZ: yy/mm/dd,hh:mm:ss

HTTP/1.1 200 OK

Date: Tue, 20 Feb 2024 15:08:36 GMT

Content-Type: text/html; charset=UTF-8

Transfer-Encoding: chunked

Connection: keep-alive

Vary: Accept-Encoding

CF-Cache-Status: DYNAMIC

Report-To: { endpoints :[{ url : https:\/\/a.nel.cloudflare.com\/report\/v3?s=eE0BEOvB06KrA6

PjmhJPt4xSMv3fCW2Ab2WfsEJrsMEU0Cj4741M1hIW0wGOVHZRqjOfJRKzNHQAJyL2A2ECkIAD

70HPWdUbl4m1AYxrbQg3bFMWVHxE9aK7YH6xOP9V0Kg= }], group : cf-nel , max_age :604800}

NEL: { success_fraction :0, report_to : cf-nel , max_age :604800}

Server: cloudflare

CF-RAY: 8587aa7888906f0b-CDG

alt-svc: h3= :443 ; ma=86400

18

#NITZ: 24/02/20,15:08:36

0

NO CARRIER

//After timeout or ' will return NO CARRIER

// Close GPRS context 1-6

AT#SGACT=1,0

Note: Please note that this script and service provided by Siretta is for test purposes only. Siretta will not guarantee that this service will remain in operation indefinitely into the future. For applications which rely on using this service it is recommended that you maintain and run the script on your own server using the example script provided below.

Example PHP Script

Additional Reading Description Author

Modem Starter Kit- Quick Start Guide: ZETA-xxP Quick Start Guide Siretta

AT command manual

Telit

Initial Modem Setup Guide

Siretta

Link to download Tera Term

https://osdn.net/projects/ttssh2/downloads/68252/teraterm-4.96.exe/

OSDN

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LINK:	https://www.siretta.com/2025/03/request-time-from-the-network-using-gp...
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