A major barrier in IIoT adoption and success is the communication between the OT/IT devices and systems. OPC Unified Architecture (OPC UA) solves this problem and is becoming integral to the success of IIoT. With several applications moving to the cloud, OPC UA ensures that the OT data makes it to the cloud systems seamlessly and securely. OPC UAcloud connectivity is a critical enabler for IIoT as also recommended in the Reference Architecture Model for Industry 4.0 (RAMI 4.0) specification.

When it comes to OPC UA cloud connectivity of industrial applications and systems, we are your perfect partners. Utthunga has the right skillset and domain knowledge for this. We have collaborated with several OEMs and end industries to help them connect their products to the cloud via OPC UA.

Why OPC UA Cloud Connectivity is required for industries?

The industrial process, in the context of IIoT, requires a constant flow of data from one device/system to another, both vertically and horizontally. As the data leaves its source, the semantic information of that data should also travel with it. This way the various heterogeneous consumers of the data can make sense of the data in a context-driven manner. OPC UA enables data sharing with context. Cloud and OT layers are two different worlds. OPC UA to AMQP ensures the data reaches the cloud seamlessly, securely, and without losing its context.

This remote OT data in the cloud means stakeholders can monitor and diagnose problems in their devices, prototypes or the processes. The cloud infrastructure can then be leveraged by the OEM or end-industry for various purpose.

opc ua cloud connectivity

OPC to Cloud Integration Services provided by Utthunga

Utthunga’s uOPC suite is a secure connectivity platform based on OPC UA technology that empowers factory automation. Our plug and play purpose-built platform gives you an end-to-end control over your IIoT world. You get a secure data integration for IIoT applications, OPC interface for SAP/ERP, and custom reporting. Not only this, uOPC suite provides an OPC enabled gateway so you can leverage the maximum benefits of OPC UA for your automation system.

We focus on providing industrial-grade OPC UA to AMQP and cloud integration functionalities to give control of everything through a unified platform. Some of our OPC to cloud integration services include

  • OPC UA to MQTT and OPC UA to AMQP integration
  • Simultaneous connections to multiple OPC UA servers and Azure IoT hubs
  • Tailor-made OPC based IIoT solutions
  • Easy integration of existing and new controllers into Industrie 4.0 solutions
  • Integration of automation devices via MQTT Publisher, REST API functionality into IoT cloud applications
  • Diverse proprietary protocols and uDTM integration

Our expert team is abreast of the latest developments in the OPC UA to MQTT world and implements them to suit your requirements. We combine our PubSub communication expertise with the new Ethernet extensions for Time-Sensitive Networks (TSN). It means that the TSN-enabled network components like switches can implement effective real-time communication between controllers from different vendors.

Why Utthunga for OPC Cloud Integration Services?

Are you looking for a trusted OPC UA cloud connectivitypartner who can scale your business to match the growing digital wave? We bring the following strengths to the table:

  • An agile and competent team to implement OPC to cloud integration solutions
  • More than 13 years of domain experience building simple to complex industrial systems
  • Professional experts in cloud-computing technologies
  • Active OPC Foundation member. We are also the OPC Foundation implementation contractor of the OPC PubSub module
  • Expert in various OPC UA to MQTT based companion specifications


In a OPC UA Pub/Sub architecture, consider below two scenarios.

  • No-Broker use case: Resulting in faster cycle times and within the network
  • Broker use case: Resulting in slower cycle times and outside of the network

However, OPC UA pub/sub by itself doesn’t cover the QoS policies. It maps to the QoS of the brokers. So, if the brokers have the QoS, the messages are handled as per that QoS policies.
For example, if MQTT is being used, both publisher to Broker and Broker to subscriber can be configured with different QoS and the message delivered is ensured as per that set of QoS policies.

Yes. In the OPC UA client server architecture, it is possible to have read/write control defined/ restrictions applied at the tag level at the server end.

The Pub/Sub model doesn’t place a limit on the number of maximum client connections. However, it depends on system configuration of your application.

To answer your question, being a publisher or a subscriber doesn’t necessarily mean that they are forced to be a client or a server. It depends on the datatype that they require at that particular moment.

Yes, it’s possible to use brokers for the OPC UA PubSub middleware module integration. However, brokers are not implemented for the providing security measures. They are used to transfer the load in the OPC UA Server.

This is a common question raised by all. Yes, it is possible to have edge devices to have both OPC Client and OPC server capabilities. Utthunga has already executed at least 3 projects with both client and server in single device.
Consider the scenario where you have 3 PLCs with OPC UA running on them and you have a separate edge gateway. In this case, the edge gateway will have OPC UA Client to connect to the PLCs gather data and expose the aggregated data again via OPC UA using a OPC UA server.

To answer your question, MQTT broker is the middleman between subscribers and publisher, i.e. it manages the channels where in messages are transmitted. OPC UA Pub-Sub does message exchange over MQTT protocol.

Please share the specific machine model and controller details and we shall get back to you.

All the open connectors have basic functionality that would be limited in terms of flexibility and maintenance. We provide interface software that is certified, flexible and provide support services.

In general, level 2 and above is recommenced but based on the specifics of the plant and operational requirements.

MQTT only handles the message exchange. Nothing more. The data harmonisation across different solutions that use MQTT is possible only if the data that is being exchanged, is harmonized to begin with. OPC Information Models and PubSub specification does that.

No, OPC UA does not work with unidirectional gateways (diodes). OPC UA communication supports a Client-Server and/or PubSub communication mode. The unidirectional feature of data diodes does not allow OPC UA to work.

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