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

HWg-SMS-GW3 is GSM (2G) central gateway that allows HWg devices, SensDesk portals, and third-party software/hardware to send text messages (SMS) and make voice calls alerts.

Its main use is when customers have multiple HWg devices for remote monitoring. They can all connect to a single SMS-GW to send alarm alerts (SMS / Voice calls) to different phone numbers. No extra software is needed, and it works over the local network using Box-2-Box (Peer-to-Peer) communication.

SensDesk portals can also use SMS-GW3 for alerting, as long as the gateway is accessible to the portal (either through a VPN or a public IP address).

For third-party users, the SMS-GW can be handy for alerting through the SNMP interface.

  • Connectivity: Ethernet (10/100 Mbit/s)
  • GSM (2G) antenna: External 3m cable, SMA
  • Internal memory for outgoing SMS queue: 100 messages
  • SMS/Calls GW for all HWg devices (RME)
  • SMS/Calls GW for any NAGIOS (plugin by NETWAYS)
  • Open API: SNMP, XML, netGSM (http, SOAP)
  • Supports the "SMS + Ring" function for combined SMS and ring notifications.
  • Mechanical: 76 x 93 x 28 mm, wall-mountable, fits on a DIN rail
Applications and usage: 
  • Single SMS gateway for the entire network with an easy-to-use web-based configuration.
  • Send text messages without the need for any additional software.
  • Configure the recipient's phone number directly in the sending device.



Horizontal menu

Sending SMS alerts from HWg devices over 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).       


Sending SMS alerts from Portal or HWg devices

  • Any Portal (based on SensDesk Technology) can use SMS-GW for sending alerts.
  • All HWg devices can send SMS alerts directly (to the SMS-GW) or via the Portal.
    Via Portal is there benefit of central alerts management & possibility of Device Invalid Alert (device is inaccessible or fails)
  • Recipients' phone numbers (Mr. Purple, Mr. Green) are configured in the sender (In the Portal or in the Device).
    One GW can be alerting to several telephone numbers.

>> SensDesk


3rd party usage of SMS-GW

  • Using netGSM (SOAP - HTTP POST)
  • Using HTTP GET
  • Using the SNMP Write function

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


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) 






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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