Displaying sensor data and weather alerts on a Wasm page

Our goal is to develop a small application that displays weather alerts and our sensor data that is being published to an MQTT broker, so we will need some very basic HTML and JavaScript skills in order to achieve this. We start by developing a small server that serves the Wasm app to a client.

Serving the application

As Wasm is served to a browser, we need an HTTP endpoint that serves all files we might need. We start by creating a new folder named wasm-server inside the Chapter07 folder, and inside this folder we create a new main.go file with an empty main function. Now, follow these steps to implement the server:

1. Define the directory where the FileServer should look for files, as follows:

   const dir = "Chapter07/html"

2. Now, inside the main function, create a new FileServer and pass the directory as a parameter, as follows:

   fs := http.FileServer(http.Dir(dir))

3. Start an HTTP server that listens...