How to Efficiently Read Data from a Serial Port in Go Using Delimiters?

Waiting for Input with Serial Ports in Go

You're attempting to communicate with a sensor via a serial port using Go. Your current implementation includes a call to time.Sleep to delay after writing to the port before attempting to read. This method is not optimal, and you're seeking an alternative using a while-loop for continuous data reading.

The Problem with Your Loop

The issue with the while-loop you've provided is that Read returns any available data, even if it's incomplete. Consequently, buf is likely overwritten during each loop iteration.

Solution: Using a Delimiter-Based Approach

Instead of relying on a delay, you can read data until you encounter a specific delimiter indicating the end of the message. In your case, it appears that x0a may serve as the delimiter.

For this purpose, you can utilize a bufio.Reader as follows:

<code class="go">package main

import (
    "fmt"
    "github.com/tarm/goserial"
    "bufio"
)

func main() {
    // Establish serial port connection
    c := &serial.Config{Name: "/dev/ttyUSB0", Baud: 9600}
    s, err := serial.OpenPort(c)

    if err != nil {
        fmt.Println(err)
    }

    // Write to the port
    _, err = s.Write([]byte("\x16\x02N0C0 G A\x03\x0d\x0a"))

    if err != nil {
        fmt.Println(err)
    }

    // Create a bufio.Reader for delimited reading
    reader := bufio.NewReader(s)

    // Read data until the delimiter is encountered
    reply, err := reader.ReadBytes('\x0a')
    if err != nil {
        panic(err)
    }

    // Print the received message
    fmt.Println(reply)
    
    s.Close()
}</code>

This approach will continuously read data from the serial port until it encounters the delimiter, providing a more efficient and reliable way of retrieving incoming messages.

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