HD67B19-G43-B2 – Industrial OPC UA Client to MQTT Converter with LAN, LTE SIM and eSIM

HD67B19-G43-B2 Converter – advanced OPC UA Client to MQTT gateway with dual Ethernet and LTE connectivity.

The HD67B19-G43-B2 is an industrial-grade OPC UA Client to MQTT converter designed to seamlessly integrate automation systems, OPC UA servers and IoT infrastructures. Built in a robust Housing type B enclosure with DIN rail mounting and terminal block connectors, it ensures reliable communication even in demanding industrial environments. This model enables efficient bidirectional data exchange between OPC UA ecosystems and MQTT-based cloud platforms, edge applications and telemetry systems.

Compared to the standard HD67B19-B2 version, the G43 variant introduces advanced communication redundancy with both a LTE SIM slot and an integrated eSIM. This makes the device ideally suited for remote installations, mobile infrastructure, temporary systems, and applications where Ethernet connectivity is limited or unstable. With dual Ethernet ports supporting OPC UA Client and MQTT services independently, the converter offers maximum flexibility in IT/OT integration.

The device is compatible with a wide range of industrial applications, cloud environments and analytics platforms. It supports structured OPC UA communication with multiple servers and maps acquired data to MQTT topics, enabling real-time monitoring, reporting and process optimisation.

OPC UA Client functionality for industrial interoperability

Operating as an OPC UA Client, the HD67B19-G43-B2 can connect to multiple OPC UA servers simultaneously, read and write variables, and manage hierarchical data structures. It supports secure communication and is capable of handling diagnostic variables, process values and event-driven information. This makes it an excellent tool for connecting machines, PLCs, sensor networks and supervisory systems to IoT and IIoT platforms.

• Real-time reading and writing of OPC UA variables
• Support for multiple OPC UA servers
• Configurable polling intervals
• Secure communication options (TLS)
• Full compatibility with SCADA, MES and industrial analytics systems

MQTT communication for cloud and edge applications

The converter supports MQTT publish and subscribe operations, enabling full integration with popular cloud and IoT platforms such as AWS IoT, Azure IoT Hub, Mosquitto, EMQX, HiveMQ and Google Cloud IoT. It can publish OPC UA data as structured MQTT messages and subscribe to topics to forward commands back to the OPC UA ecosystem.

• Support for MQTT QoS 0/1/2
• Configurable topics for publishing and subscribing
• Support for retained messages and persistent sessions
• Mapping OPC UA variables to JSON/MQTT structures

Dual Ethernet + LTE SIM + eSIM – communication redundancy and flexibility

One of the key strengths of the HD67B19-G43-B2 is its triple connectivity layer:

• Ethernet port 1 (RJ45): MQTT communication
• Ethernet port 2 (RJ45): OPC UA Client communication
• LTE SIM slot for standard mobile connectivity
• Integrated eSIM for fully embedded cellular communication

This design enables:

• operation in remote or isolated installations,
• failover communication during Ethernet outages,
• multi-operator deployments using eSIM,
• deployment in mobile or temporary systems.

Industrial Housing type B enclosure

The compact Housing type B enclosure allows easy DIN rail installation (36 × 60 × 95 mm). Terminal block connectors provide secure wiring suitable for environments with vibration or electromagnetic interference. The wide temperature range of -40°C to +85°C ensures reliable operation in energy systems, outdoor applications, distributed automation and harsh industrial conditions.

Power supply flexibility (8–24 V AC or 12–35 V DC) makes the converter compatible with various cabinet power architectures.

Typical applications

• Integration of OPC UA servers into MQTT-based cloud architectures
• Edge computing and distributed analytics
• Remote monitoring and industrial telemetry
• Connection of machines and production lines with IIoT platforms
• Smart infrastructure and building automation
• Systems requiring LTE redundancy (SIM + eSIM)

Technical specifications

• Ports: 2× Ethernet (RJ45), LTE SIM slot, integrated eSIM
• MQTT: 10/100 Base-T Autosensing
• OPC UA Client: 10/100 Base-T Autosensing
• Power supply: 8–24 V AC or 12–35 V DC
• Power connector: 2-pin 5 mm terminal block
• Operating temperature: -40°C to +85°C
• Dimensions: 36 × 60 × 95 mm
• Weight: approx. 200 g
• Software: SW67B19
• Order code: HD67B19-G43-B2

The SW67B19 configuration software for the HD67B19-G43-B2 can be downloaded here: DOWNLOAD

If you need help selecting the right OPC UA Client to MQTT converter or want to verify compatibility with your industrial system, our engineering team is ready to assist you.