MQTT stands for MQ Telemetry Transport. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks. The design principles are to minimize network bandwidth and device resource requirements whilst also attempting to ensure reliability and some degree of assurance of delivery. These principles also turn out to make the protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of Things” world of connected devices, and for mobile applications where bandwidth and battery power are at a premium.



Multi-Protocol MasterOPC includes a MQTT client which supports bi-directional communication between MQTT devices and SCADA systems.

Feature highlights:

  • Transfer values of any server tags together with timestamps and quality tags.
  • Receive values from other MQTT devices and write them to tags.
  • Intuitive flexible configuration of MQTT telegrams with receipt acknowledgement, as well as flexible configuration of message format.
  • Track  MQTT broker connection state  with optional automatic reconnection on failure.

How to purchase MQTT-Client?

You can purchase Multi-Protocol MasterOPC on the website on favorable terms. To place an order, add the item to the cart, and fill in your contact information so that we could get back to you. There is no need to buy MQTT-Client separately, as it is already included in the package.

You can also download the demo version and test the software. It is optimized for multiple input and output points, but you can only use it for a limited period of time. Do you have any questions about how MQTT-Client operates? Call the number in the "Contacts" section, and the manager will provide you with full details on the product.

359* 0* 0* € * 330*
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* without VAT
  • A dongle
  • A software key
  • -
A software key is generated for launching the respective OPC server on one computer only. If such a protection mechanism is used, an OPC server cannot be transferred onto other computer. When launching an OPC server for the first time, the code is generated. You should send that code to the sales department. Next, you receive a software key (an unlock code). You should input that key. After that, your OPC server starts, and, in future, never demands that you input the key.
This version has no restrictions on functionality and number of tags during the trial period of 1 month.
A dongle is a small device that plugs into a USB port of a computer and provides the use of the OPC server on the computer. If required, such an OPC server can be transferred onto any other computer: simply plug the USB dongle and install the product, using the delivered distributive. A dongle is sent by mail, and postage is paid by the buyer.
This version supports 32 tags at the most. The version is not trial, it is provided for use in small projects. * without VAT
Demo version The demo version supports unlimited number of tags but an operation time of that version in the run-time mode is limited. In addition, the demo version has some other functional restrictions. 1. 1 hour in the run-time mode. After 1 hour the server goes to the design-time mode, and the run-time mode can be launched again.
2. The server cannot be launched as a Windows service.
3. When connecting a client the server does not start automatically. You should launch the server, using the respective button. After that clients can be connected to the server.
Free version This version supports 32 tags at the most. The version is not trial, it is provided for use in small projects.
Free version does not support redundancy, MQTT, ODBC, IEC 60870-5-104