Smart meters, EV chargers, inverters and batteries report readings and receive control commands. Publish/subscribe lets billing, monitoring and control systems consume the same data independently.
No card required
You build the applications, ConnectMQ moves the data. Meters, chargers and inverters publish once; monitoring, billing, grid analytics and your customer app each subscribe in parallel, and commands go back on dedicated topics.
energy/site-12/meter-03/readings
energy/site-12/charger-07/session
energy/site-12/charger-07/commandsA meter publishes its reading once. Monitoring, billing and analytics each subscribe on their own — none of them polls the meter, and adding a new consumer never touches the device. Commands to chargers travel back on their own topic, with their own permissions.
{"kWh":18452.6,"kW":7.4}energy/site-12/charger-07/commands{"maxKw":11}Dynamic load management, one of the most common MQTT setups in energy: the site meter publishes its load, the charging backend subscribes, and charger commands go back on their own topics. Site and backend both connect out to ConnectMQ over TLS.
18:04 Site meter
Publishes the site load every few seconds. Another car plugs in and the site reaches 38.5 kW.
energy/site-12/meter-03/readings → {"kW":38.5}18:04 Charging backend
Subscribed through ConnectMQ: it sees the 35 kW connection limit exceeded and lowers charger 07.
energy/site-12/charger-07/commands → {"maxKw":7}18:04 Charger 07
Reduces its power and reports the new session state.
energy/site-12/charger-07/session → {"kW":7}18:05 Site operator
Gets a notification: the site is back under its limit, and every car keeps charging.
Billing never misses a reading: it subscribes to energy/site-12/+/readings on its own, with its own credentials — load management and billing never get in each other’s way.
Machines, PLC gateways, OEE and quality data
Hubs, sensors and Home Assistant setups
Vehicle tracking, telematics and cold chain
Smart devices you ship to your own customers
Robot fleets talking to fleet managers and AI pipelines
Power, cooling and rack environment
Streetlights, parking, air and waste sensors
Soil probes, weather stations and irrigation
From first ESP32 to classroom labs
Start on the Free plan with no card. Basic covers up to 100 concurrent connections — enough for the meters, chargers and inverters of a pilot site. Move to Scale when you roll out.
