As an easy to learn higher language Delphi offers everything you need for programming TCP/IP applications. This also makes Delphi a favorite tool for creating applications that communicate with the Web-IO Digital. Additional drivers or DLLs are not required.
Visual C++ was until recently one of the most widely used development platforms for creating Windows applications. But in the meantime, more and more programmers are working with the .Net Framework and creating their applications in C#.Â
Visual C++ is one of the most used development platform for creating Windows applications.
As successors to MS Visual Basic and VB.Net there are now VB 2005 and 2008. They also offer everything needed for programming TCP/IP applications. This makes Visual Basic 2005 / 2008 a favorite tool for creating applications that communicate with the Web-IO Digital, especially since the Express version of VB 2008 was offered from Microsoft free for downloading. Additional drivers or DLLs are not needed.
As an easy to learn higher language Visual Basic offers everything you need for programming TCP/IP applications. This also makes Visual Basic a favorite tool for creating applications that communicate with the Web-IO Digital. Additional drivers or DLLs are not required.
The Internet browser is today part of every modern operating system and is valued as a versatile display instrument for surfing the Internet.
In this tutorial the JavaScript MQTT client from the Eclipse-Paho Project will be used to create an individual interface for the Web-IO 4.0 Digital.Â
Here the states of the Web-IO are buffer stored as a retained message with the broker and represented by the Web client in a simple HTML table.
When one of the outputs is clicked on, the Web client sends an MQTT Publish which instructs the Web-IO to switch the corresponding output.
This step-by-step manual explains the setup of Box-2-Box operation of the Web-IO 4.0 Digital via the Internet of Things.Â
In Box-2-Box mode you connect two Web-IOs together so that switching signals present on the inputs of the one device are transmitted via MQTT to the outputs on the other device. The broker is CloudMQTT, a commercial, free provider for smaller applications.
To familiarize yourself with MQTT we recommend the page "Communication in the Internet of Things."
Switching signals are often needed someplace other than where they originate. Connecting switching outputs with the components to be switched across locations
involves a lot of cabling effort - especially when multiple signals need to be sent.
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