Node-HIU Engineer

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The Node-HIU Engineer connects hydraulic interface units to the outside world, enabling two-way connectivity across 600+ mobile networks using MQTT over GSM. 3 years connectivity is provided as standard.

  • Remote commissioning
  • Fault diagnosis and alarm routing
  • Reporting of sensor readings, including temperatures, differential pressure & flow rates
  • Load shedding

It also connects to the end users household WiFi to provide a user interface and to interact with home automation systems, including Alexa. This allows central heating to be controlled by voice, using the command "turn the heating on."

  • User interface over PC or mobile devices
  • Voice and remote control of services via Alexa
  • Diversity reporting
  • Thermostat, with 7 day, 15 minute slot, self learning facility
  • Occupancy Sensing

And it can bridge between RS232/485 enabled heat meters and billing companies

  • Meter readings
  • Data forwarded over email, MQTT or custom API
  • Remote shut-off, or reduction in 'Quality Of Service'

Other than a 2-core wiring connection to the HIU, and power, no further wiring is required. This allows all services to be provided without any cabling infrastructure in the building, and makes the system both secure and resilient.


It uses a unique combination of technologies to provide a retro-fit wireless solution that will interface with existing control systems, will work on almost any phone network, and has a low cost data tariff.

  • Raspberry Pi computer with GSM modem
  • MQTT over GSM SIM card
  • Node-RED programming environment
  • Modbus


Thingstream’s platform enables devices to connect to the strongest GSM network available, almost anywhere in the world, and communicate using IoT Messaging – a unique combination of MQTT and USSD messaging protocols. Connectivity is available in over 190 countries across 600+ networks, including Vodafone, O2, EE, T-Mobile, Telenor, 3, KPN, AT&T, Rogers & Three UK.

  • A unique approach to enabling MQTT over GSM without the need for cellular data
  • Immediate global coverage, across 627 GSM networks across 190+ countries
  • No TCP-IP (internet) for an inherently more secure connection
  • Longer reach to base stations than cellular data, to better service remote locations
  • A scalable, low power and cost efficient way to connect devices, designed for constrained devices and low-bandwidth, high-latency or unreliable networks
  • Low power with: 93x faster throughput, 11.89x less battery to send, 170.9x less battery to receive, 1/2 as much power to keep connection open, 8x less network overhead