cMT/HMI MQTT User Manual
■Designed to be light weight, open, and simple, MQTT is a subscriber/publisher messaging transport protocol that is considered a great solution for applications where a small code footprint is required and/or network bandwidth is scarce. It is particularly suitable for continuous monitoring of sensory data such as temperature, pressure, water level, energy monitoring...etc.
■Publisher, Subscriber, and Broker are three important roles in MQTT protocol. As shown in the following figure, when the Publisher publishes a message to the Broker, the Broker will deliver the message to the subscriber.
■HMIs and MQTT
▲The Advanced HMI and cMT products can function as publishers, subscribers, and/or brokers. The HMI processes data from PLCs and can publish messages to an external MQTT broker, which will handle message delivery to the subscribers. In this manner, message publishing is possible even when the HMI is positioned behind firewalls and access to the HMI is difficult.
▲Alternatively, an external broker is not necessary. MQTT messages can be published to a built-in internal MQTT broker, and an MQTT client can subscribe directly to the MQTT broker inside the HMI to receive message updates. This scheme can be realized even remotely as long as the MQTT client can connect directly to HMI, such as with VPN or EasyAccess 2.0.
▲MQTT support was introduced in EZwarePlus version 5.03.02.026. The current feature set described in this manual is based on EasyBuilder Pro (the next generation of EZwarePlus) version 6.01.01.117. Not all features may be present in earlier versions. MQTT support is available in the Advanced HMI Series and the cMT Series. Some advanced features are limited to the cMT Series and are described later in this manual.
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cMT Series 、 cMT 、 Advanced HMI Series 、 Advanced HMI 、 EBPro |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2018/6/19 |
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Rev. 00 |
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1010-1068 |
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3.9 MB |
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