Main meters, sub-meters, power analysers and BMS controllers publish to ConnectMQ. Your energy management system, dashboards and production tools subscribe, so you see kWh, peak demand, gas and compressed air per site, line and asset — while you can still do something about it.
No card required
PUBLISH energy/dallas/line-1/main-meter/power
{"ts":"2026-10-22T10:15:00Z","kw":412.6,"kwh_total":1849213.4,"pf":0.94,"v_l1":231.2}QoS 1 · TLS 8883 · PUBACK
Energy cost arrives as one monthly invoice per site. Sub-meters exist, but they are read by different gateways, stored in a BMS or a vendor portal and never put next to production data. Peak-demand charges are discovered after the fact, and energy per part or per square metre remains a guess.
Power analysers, sub-meters and pulse counters on lines, compressors, HVAC and chillers are read over Modbus, M-Bus or BACnet by a site gateway or the BMS.
The gateway publishes kW, kWh, power factor, gas and compressed-air flow to topics per site, building, line or asset over TLS.
Your EMS, historian or dashboard subscribes and puts consumption next to production counts or occupancy to calculate energy per part, shift or square metre.
Threshold rules alert when demand approaches the contracted peak, and your control logic can publish a command to shed or shift non-critical loads.
Factories, stores, offices and warehouses publish to one private broker with a consistent topic tree and separate credentials per site.
The same reading feeds the EMS, sustainability reporting, the plant dashboard and the 3D Digital Twin without reading the meter twice.
Threshold rules on kW or consumption notify facility and plant managers before a peak turns into an invoice line.
Load-shedding and setpoint commands use QoS 1 on dedicated command topics, and retained state shows what each load is currently set to.
energy/dallas/line-1/main-meter/power
energy/dallas/utilities/compressor-02/power
energy/dallas/site/demand (retained)
energy/dallas/hvac/ahu-03/setMany modern meters and power analysers publish MQTT natively. For Modbus, M-Bus or BACnet devices, a gateway — an industrial IoT gateway, a PLC or Node-RED on an edge PC — reads the registers and publishes the values to a topic per meter over TLS.
MQTT can carry the measured data your energy management system uses for energy reviews, baselines and energy performance indicators. ConnectMQ delivers that data; the analysis, reporting and any certification stay with your EMS and your organisation.
They solve different problems. BACnet runs the building automation inside a site; MQTT moves data out of many sites to central applications. Most portfolios keep BACnet in the building and publish selected points to an MQTT broker for central energy monitoring.
Start on the Free plan — no card required — connect your first devices today and upgrade when you go live.
