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W&T Interfaces
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Application for Web-IO: Message Queue Telemetry Transport

MQTT: Industry 4.0 you can touch

MQTT: Simple construction

Terminal devices in the Internet of Things generally have no public IP address, but rather are connected over private networks. Cross-network connections can be opened only in the outgoing direction without a lot of additional effort. This eliminates peer-to-peer connections as a communication channel for the Internet of Things.

The solution is provided by the protocol MQTT: Terminal devices open a connection to a publically accessible messaging service, the broker. Here they can as publishers publish information and as subscribers subscribe to it.

MQTT is scalable and supports thousands of possible terminal devices. It works reliably, even in networks with low bandwidth or when there are occasional connection interruptions. Since its standardization in 2013 MQTT has taken on increasing importance as a communication protocol for the Internet of Things.

Web-IO with MQTT

mqtt digital io

Web-IO 4.0 Digital

W&T Web-IOs are equipped with digital in- and outputs which you can access over the network. Effective action management and numerous network services enable flexible use in a variety of application scenarios.

Possible applications

  • Monitoring digital outputs

    When the state of a digital input changes, the Web-IO responds with freely configurable actions. This can include sending emails, SNMP traps or MQTT messages.

  • Utility meters in the network

    Each digital input is linked to a counter which counts incoming pulses. This allows for example utililtymeters equipped with an S0 interface to be easily incorporated into the network.

  • Network remote switch

    Various network protocols offer access to the digital outputs. This allows them to switch connected peripherals - or building services and production equipment using coupling relays.

  • Other supported protocols and M2M interfaces

    • TCP and UDP sockets, client and server
    • SNMP including traps
    • SMTP e-mail sending
    • OPC server
    • Modbus/TCP
    • HTTP (Web interface and REST)

More information