Robust & High Performance
- Ensure reliable data delivery under high load
Industrial MQTT Broker for OT and IIoT Data
Move industrial data securely from field devices to the cloud and enterprise systems, unifying OT, IT and IIoT data over a single, standard-based MQTT stream, with Sparkplug B specification support.
- Eclipse Sparkplug B certified
- TLS/SSL encrypted
- QoS 0–2
- On-prem, cloud or hybrid
Overview
What is the MQTT Universal Broker?
- What it is
SIOTH® MQTT Universal Broker is the MQTT broker of the SIOTH® IT/OT integration platform, built specifically for industrial environments rather than adapted from a general-purpose broker. The MQTT Universal Broker is a configurable server within SIOTH® Data Flow.
- What it does
Via SIOTH® Data Flow, it converts data collected via legacy and modern industrial protocols, including OPC DA, OPC UA, Modbus, Siemens S7 and DNP3, into a secure, standard-based MQTT stream, so plant-floor data reaches SCADA, MES, cloud and enterprise systems without replacing existing field equipment.
- Who it's for
Designed for teams who need a single, secure gateway between field devices and the applications that consume their data:
- OT and IT teams
- Systems integrators
- Industrial software architects
One broker between your field devices and every application
Break Down Data Silos
Integrate IT & OT systems and IIoT devices seamlessly.
Edge to Cloud Data Flow
Reliable and secure data transfer.
Protocol Conversion
Collect operational data from OPC, OPC UA, Modbus, DNP3, S7… data sources via SIOTH® Data Flow and expose them into a unified MQTT broker.
Industrial MQTT Broker for OT & IIoT Data
MQTT Universal Broker vs. Standalone MQTT Brokers
Most MQTT brokers are built for general IoT or cloud workloads, with industrial connectivity added through separate gateways. SIOTH® MQTT Universal Broker is built for OT from the ground up, combining industrial protocol connectivity via SIOTH® Data Flow, visualization with SIOTH® Unified HMI and industrial-grade security in one platform.
Field devices
- PLCs
- RTUs
- DCS
- SCADA
- Extra toolProtocol gatewaySeparate product
- MQTT brokere.g. Mosquitto
- Extra toolVisualization toolSeparate product
- ApplicationsSCADA, MES, cloud
- Drawback: Separate protocol gateway
- Drawback: Separate dashboard tool
- Drawback: Self-managed, DIY integration
Field devices
- PLCs
- RTUs
- DCS
- SCADA
SIOTH® MQTT Universal Broker
- ConnectProtocol conversionVia SIOTH® Data Flow
- PublishMQTT brokerSparkplug B · TLS/SSL
- VisualizeSIOTH® Unified HMIDashboards
- SCADA
- MES
- Cloud
- Enterprise
- Included: OT protocol conversion via SIOTH® Data Flow
- Included: SIOTH® Unified HMI
- Included: Eclipse Sparkplug B certified · TLS/SSL
- Included: Wizard-based SIOTH® installation
One broker within one platform: SIOTH®. No separate gateway or visualization layer.
See the full capability comparison
| Capability | Standalone MQTT broker (e.g. Mosquitto) | SIOTH® MQTT Universal Broker |
|---|---|---|
| OT protocol conversion (OPC DA/UA, Modbus, S7, DNP3) | Not included: Not included. Requires a separate gateway | Via SIOTH® Data Flow |
| Dashboards and visualization | Not included: Not included. Requires a separate visualization tool | SIOTH® Unified HMISee visualization |
| OT security design: protocol break, DMZ support (Purdue Model), IEC 62443-aligned | Not included: Not typically OT-specific | Included |
| Deployment model | Varies: Self-managed, DIY integration | Purpose-built for IT/OT integration, with wizard-based SIOTH® installation |
Connectivity
Connect PLCs, SCADA and field devices to MQTT
Bridges PLCs, RTUs, DCS and SCADA systems into a single MQTT stream through native support for the protocols already running on the plant floor.
Step 1: Field layer
PLCs, RTUs, DCS, SCADA
Native support for the legacy and modern protocols already running on the plant floor.
- Classic OPC
- Open standards
- Industrial protocols
- IT sources
Modbus register
- device
- Pump P-101 PLC
- protocol
- Modbus TCP · unit 1
- register
- 40001 = 420
- scale
- ×0.01 bar
Step 2: Protocol conversion
Via SIOTH® Data Flow
Converts data from every connected protocol into one standard-based MQTT stream.
- OT to MQTT
- SIOTH® Rule and Workflow Engine
Normalized tag
- tag
- Discharge_
Pressure - value
- 4.20 bar
- quality
- Good
- time
- 08:42:15.120
Step 3: Secure publish
Encrypted, standard topics
Publishes over encrypted communication with the Sparkplug B topic namespace.
- TLS/SSL
- Sparkplug B
- QoS 0 · 1 · 2
- WebSockets
MQTT message
- topic
- spBv1.0/
Plant_ A/ DDATA/ Edge_ 01/ P-101 - qos
- 1
- seq
- 42
- port
- 8883 · TLS
Step 4: Consumption
Cloud, MES, dashboards
Plant-floor data reaches enterprise systems without replacing field equipment.
- SCADA
- MES
- Cloud
- Enterprise
- Dashboards
Dashboard
P-101 · Discharge pressure
4.20bar
Updated 08:42:15
- OPC DA
- OPC HDA
- OPC AE
- OPC UA
- MQTT Sparkplug B
- Modbus
- Siemens S7
- DNP3
- IEC 60870-5
- SNMP
- Databases
Broker onlineTLS/SSLSparkplug BLast message 08:42:15
Features
Key Features of the MQTT Universal Broker
Highly Scalable
- Connect simultaneously to multiple data sources
- Scales from a few to millions of data points
Edge, On-Premise, Cloud or Hybrid
- Support data flows from edge to cloud and on-premises
- Enable seamless hybrid deployments
Data and Event Processing
- Reason, compute and transform IoT data using the SIOTH® Rule and Workflow Engine
Generates
FAQ
Frequently Asked Questions
Integration, security, Sparkplug B, QoS and deployment options for the MQTT Universal Broker.
Yes. Through SIOTH® Data Flow, the MQTT Universal Broker supports a wide range of legacy and modern industrial protocols, including OPC DA, Modbus, Siemens S7, DNP3 and IEC 60870-5.
This allows you to modernize existing infrastructures without replacing legacy equipment.
The MQTT Universal Broker includes built-in industrial security mechanisms such as user authentication, TLS/SSL encrypted communication and secure data transmission across IT and OT networks.
SIOTH® is IEC 62443-aligned, with TLS/SSL encryption, user authentication, role-based access control (RBAC) and audit trails.
Yes. SIOTH® Unified HMI lets you monitor real-time and historical data, system performance and data flows.
This helps operators and engineers quickly understand system behavior.
Yes. MQTT Universal Broker is Eclipse Sparkplug B certified and supports MQTT Sparkplug B, using its standardized topic namespace and payload structure so subscribing systems can track real-time device state across the network.
It supports QoS levels 0 through 2 for reliable message delivery.
Yes. MQTT Universal Broker can be deployed on-premises, in the cloud or in a hybrid configuration to match your infrastructure and security requirements.