How to Correctly Read All Data from a Serial Port in Go with a While-Loop?

Reading from Serial Port Using a While-Loop

This question concerns a program written in Go to communicate with a sensor via a serial port. The program includes a while-loop to read incoming data, but it fails to function correctly.

Original Code:

<code class="go">buf := make([]byte, 40)
n := 0

for {
    n, _ = s.Read(buf)

    if n > 0 {
        break
    }
}

fmt.Println(string(buf[:n]))</code>

Problem Explanation:

The issue with this code is that Read() can return at any point in time with any amount of data available. This means that if a small amount of data is received, it will be overwritten in the next loop iteration.

Solution:

To correctly read all incoming data, we can use a bufio.Reader to read data until a specific delimiter is encountered. In this case, the delimiter is assumed to be 'x0a'.

Modified Code:

<code class="go">reader := bufio.NewReader(s)
reply, err := reader.ReadBytes('\x0a')
if err != nil {
    panic(err)
}
fmt.Println(reply)</code>

This code will continue reading data from the serial port until the 'x0a' delimiter is encountered. The result is then stored in the reply variable and printed.

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