Remote particle counters, differential pressure transmitters and temperature and humidity probes in pharma, food and semiconductor cleanrooms publish over MQTT. Your validated EMS records and alarms; QA, production and facilities see the same values live.
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PUBLISH ems/plant-2/fill-finish/room-b204/pc-03/particles
{"ts":"2026-10-22T09:12:00Z","grade":"B","state":"in_operation","um0_5_m3":1180,"um5_0_m3":0,"flow_lpm":28.3,"sample_s":60}QoS 1 · TLS 8883 · PUBACK
Environmental monitoring often runs as a closed system: counters and transmitters wired to vendor hardware, data visible only on the EMS console. Production wants live room status at the line, facilities needs the same pressures as the BMS, and adding a room or a new counter brand becomes a vendor project. The EMS has to stay independent and validated, so every new consumer turns into a long discussion.
Remote particle counters (0.5 and 5.0 µm), differential pressure transmitters, temperature/humidity probes and airflow sensors report over Modbus TCP, 4–20 mA or their own network interface.
An edge gateway or PLC turns readings into topics per site, area, room and sensor — with the room’s grade and operating state — and publishes them over TLS with QoS 1.
Your validated EMS subscribes and stays the system of record: storage, audit trail, alarm acknowledgement and reports remain there. Dashboards and the MES subscribe to the same topics, read-only.
Alongside the EMS, ConnectMQ threshold rules can give facilities an informal heads-up on a falling pressure cascade or rising humidity. Formal alarms, delays and acknowledgement stay in your EMS.
QoS 1 from gateway to broker and on to the EMS, persistent sessions so readings are queued while a subscriber restarts, and a retained status for every sensor.
Per-client credentials and topic ACLs: each gateway publishes only its own rooms, dashboards and MES only read, and no one but the gateway writes to a sensor topic. TLS on every connection.
Last Will marks a gateway or counter offline as soon as its connection drops, so a silent sensor is never mistaken for a clean room.
The ISA-95 workspace maps site, area, room and sensor, and the 3D Digital Twin can show live values per room on a layout of the facility.
ems/plant-2/fill-finish/room-b204/pc-03/particles
ems/plant-2/fill-finish/room-b204/dp-01/pressure
ems/plant-2/fill-finish/room-b204/th-02/climate
ems/plant-2/fill-finish/room-b204/pc-03/status (retained)MQTT can be the transport inside a monitoring solution you validate: sensors and gateways publish, and your EMS subscribes and handles records, audit trail and alarms. ConnectMQ provides the broker, TLS, per-client permissions and QoS delivery; validating the overall system, including data integrity, is up to you.
Most remote particle counters offer Modbus TCP or a 4–20 mA output. An edge gateway or PLC reads them, adds sample volume and room context, and publishes to ConnectMQ; your EMS — or a connector in front of it — subscribes to the room topics.
Many sites keep the EMS independent of the BMS that controls HVAC, so monitoring isn’t affected by control changes. MQTT respects that split: the EMS and the BMS each subscribe with their own credentials to the topics they need, and neither can write to the other’s data.
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