SMS-GW3: a gateway for sending SMS messages from HWg devices

HWg-SMS-GW3 is a central text message (SMS) gateway that HWg devices and applications in the same network can use to dial numbers or send SMS alerts. Target phone numbers are specified in the sending device or the SensDesk Technology portal.


The central HWg-SMS-GW3 text message gateway significantly saves costs of external GSM modems as the entire installation only needs one SIM card. Neither additional software nor internet connectivity are needed.

  • Ethernet: 10/100 Mbit/s
  • Configuration: WEB interface
  • GSM antenna: External 3m cable, SMA
  • GSM standard: Quad-Band 850 / 900 / 1800 / 1900 MHz
  • Can be used to send SMS from: Poseidon2, HWg-WLD, HWg-PWR 3 / 12 / 25, IP WatchDog2, Poseidon 2250
  • Can be used to send SMS from the following software and services: Nagios monitoring software (Netways:, online service
  • M2M communication protocols: SNMP, XML, netGSM (http, SOAP)
  • Internal memory for outgoing SMS queue: 100 messages
  • Support for programmers: HWg-SDK
  • Mechanical: 76 x 93 x 28 mm, wall-mountable, fits on a DIN rail
Applications and usage: 


  • One SMS gateway for the entire network with web-based configuration.
  • No additional software is needed in order to send text messages.
  • SMS recipient's phone number is configured in the sending device.
  • Supports an “SMS + Ring” function.
  • Connection for an external antenna.
  • Quad-Band GSM.
  • Examples for programmers available in the HWg-SDK (Borland C++, MS Visual C, VB, C#, PHP, JAVA and more).



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>>Application note - How to send SMS via HWg-SMS-GW3


Sending SMS alerts from Poseidon units over the LAN                                               Sending SMS alerts from Poseidon units over the LAN                                                

  • Poseidon2 4002 sends an alarm message about a sensor value to Mr. Blue's phone number.
  • Using the Box-2-Box mode, it connects directly to the HWg GSM gateway (no software is needed).                                                                  
  • HWg-SMS-GW contains a SIM card and sends cell message alerts on behalf of all devices in the network.       
  • Message recipients' phone numbers (Mr. Blue, Mr. Green, ...) are configured in the sending device.
  • Together with the text message, it is also possible to call the recipient and let the phone ring for a short time (configured in the sending device).       


SensDesk Technology portal: Monitoring software with SMS alarms over SMS GW3                                                                                                                                                            

  • SensDesk Technology portal monitors the function of other products (Poseidon2 3266, HWg-STE Push, Damocles 1208, Poseidon 4002) over the LAN.
  • If a product is inaccessible or fails, a SMS alert is sent using HWg-SMS-GW3 in the same LAN.
  • Recipients' phone numbers (Mr. Purple, Mr. Green) are configured in SensDesk Technology portal.
  • HWg-SMS-GW contains a SIM card and sends text message alarms to different phone numbers.


Nagios SMS alerts

  • Nagios NMS monitors other devices using SNMP.                                             Nagios SMS alerts
  • In the Nagios system, a plugin enables SMS alerts over HWg-SMS-GW gateway.
  • The plugin configuration includes the phone numbers of text message alert recipients.
  • For details about obtaining and using the Nagios plugin, see the product manual.
  • The plugin was created in cooperation with Netways (MonitoringExchange:

>> Nagios (Third-party monitoring software) 


SMS alerts from the online portal

  • LAN and GSM sensors (HWg-STE Push and Ares 12) send data to the online portal. SMS alerts from the online portal
  • Your user account includes the IP address or DNS name of your HWg-SMS-GW (must be accessible at a public IP address).                                                                                                                                               
  • The configuration of each sensor in your SensDesk account can include a phone number for alarm messages.
  • Note:
    Ares 12 sends the alert to an out-of-range sensor value faster than the SensDesk portal; however, SensDesk allows to monitor and configure all alarms over the Web at a single place.
     In addition, SensDesk also monitors the network connectivity of Ares units, so it can for instance alert to an Ares unit's network connection failure.

>> SensDesk



Communication 2G LTE
Frequency bands Quad-Band
850/900/1800/1900 MHz
FDD LTE bands: B1/B3/B5/B7/B8/B20
WCDMA bands: B1/B5/B8
Sending SMS from the web Yes Yes
Open API - netGSM (SOAP - HTTP Post) Yes Yes
Open API - SNMP write Yes Yes
Poseidon2 SMS+ Calls SMS+ Calls
Damocles2 SMS+ Calls SMS+ Calls
WLD2 SMS+ Calls SMS+ Calls
STE2 SMS+ Calls SMS+ Calls
HWg-PWR SMS+ Calls SMS+ Calls
SMS + Call from
(Device on fixed IP required)
Yes Yes

Plugin for sending SMS from

  • Nagios
  • Wget
  • cURL
  • PRTG
Yes Yes

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