Blazor and Web Serial Api

Question

When will Blazor support Web Serial Api for use on the client side with WebAssembly? I have a need to communicate with a Com Port from the end users browser. I thought that since I had enabled the permission through chrome://flags/#enable-experimental-web-platform-features that I could use System.IO.Ports and then call SerialPort.GetPortName() to get a list of available Com Ports. When I make the call GetPortName() I get an exception. How can I get this to work with C# code / WebAssembly?

Answer 1

Webassembly is a sandbox and has no access to the dom, network, files or browser apis. You need to send a message to JavaScript (blazor interop) to perform this.

Answer 2

In JavaScript: https://dev.to/unjavascripter/the-amazing-powers-of-the-web-web-serial-api-3ilc
Maybe it is possible to workaround using JavaScript functions in Blazor.
Or find an colleague who can do it in JavaScript directly.

Answer 3

If you're developing your app for your customer you can:

1. develop windows-service that accepts http requests
2. Share the serial somehow on the ethernet so that the server can connect to the KNOWN ip address

Answer 4

Hi, @Ashley Davy

As far as I know, it's unable to access SerialPort via Blazor WebAssembly. And I already post answer with same thread here. Please check.