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

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

1) Device-to-GW
Customers with HWg monitoring devices are using one SMS-GW for alerting. Several HWg devices (LAN Thermometer / Energy monitoring) can 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.

2) Portal-to-GW
Any installation of SensDesk portal can use the SMS-GW for alerting. The gateway have to be accessible from the portal (either through a VPN or a public IP address).

3) 3th party SW to GW
For third-party (non HWg products) users, the SMS-GW can be usefule gateway for alerting through several Open API.

  • netGSM (SOAP documented protocol)
  • General SNMP (Write)


  • Connectivity: Ethernet (10/100 Mbit/s), LTE
  • LTE 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 SNMP software
  • 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.


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Device-to-GW: Sending SMS alerts from HWg devices over LAN

Customers with HWg monitoring devices are using one SMS-GW for alerting. No additional software or service is needed, just monitonig device + SMS GW. It's working over the local network using Box-2-Box (Peer-to-Peer) communication

  • Poseidon2 4002 & SMS-GW are on the same LAN
  • Telephone number of Mr. Blue is defined in the web gui of Poseidon2 4002 (same as SMS-GW IP address).
  • Poseidon2 4002 sends an alarm message about a sensor value to Mr. Blue's phone number via SMS-GW over the LAN. 
    Alerting use the Device-2-GW mode, no software or portal service is needed. It's part of RME (Remote Monitoring Ecosystem)
  • SMS-GW3 LTE contains a SIM card and sends cell message alerts (Ring + SMS) on behalf of all devices in the network.
  • One SMS-GW device can be used by several device on the LAN, each device can alert to different recipients (Mt. Green or Blue).
  • Message recipients' phone numbers (Mr. Blue, Mr. Green, ...) are configured in the sending device.
  • Together with the text message, it is also possible to Ring (Voice call) the recipient and let the phone ring for a short time (configured in the sending device). 




Portal-to-GW: Sending SMS alerts from the Portal

Any installation of SensDesk portal (SaaS / On-premise) can use the SMS-GW for alerting. The gateway have to be accessible from the portal (either through a VPN or a public IP address).

  • Any Portal (based on SensDesk Technology) can use the SMS-GW device for sending alerts (Ring + SMS).
  • The SMS-GW have to be accessible from the Portal (same LAN / Public IP / VPN)
  • One SMS-GW (SIM card / phone number) can be alerting to several recipients (telephone numbers) from several Teams (company accounts) in the Portal.
  • All HWg devices are connected to the Portal, based on conditions defined on the Portal are send alert via the SMS-GW.
  • Alerting via Portal is more reliable due possibility of Device Invalid Alert (device is disconnected from the Portal cca 60 min)
  • Recipients' phone numbers (Mr. Purple, Mr. Green) are configured in the Portal.

>> SensDesk Technology


3th party SW to 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.                                            
  • In the Nagios system, a plugin enables SMS alerts over SMS-GW3 LTE gateway.
  • The plugin configuration includes the phone numbers of text message alert recipients.
  • The NAGIOS 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
 HWg devices: Poseidon2 SMS+ Calls SMS+ Calls
 HWg devices: Damocles2 SMS+ Calls SMS+ Calls
 HWg devices: WLD2 SMS+ Calls SMS+ Calls
 HWg devices: STE2 family SMS+ Calls SMS+ Calls
 HWg devices: 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

HWg Video Flyer about SMS-GW3 LTE device

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