Cannot use bufio.Scanner for conn

[sago35]

For now, conn.Read may return a length of 0, so bufio.NewScanner() cannot be used.
Similarly, fmt.Fscanf() cannot be used.

Similar to the following
tinygo-org/tinygo#2739

What works now is the following code.

	buf := [1024]byte{}
	for {
		n := int(0)
		for {
			n, err = conn.Read(buf[:])
			if err != nil {
				failMessage(err.Error())
			}
			if n > 0 {
				break
			}
			time.Sleep(5 * time.Millisecond)
		}
		fmt.Printf("recv: %q\r\n", string(buf[:n]))
	}

I would like the following to work also
Because I think that is Go-way code.
Of course, we can check for errors by using conn.Read.

	scanner := bufio.NewScanner(conn)
	for scanner.Scan() {
		fmt.Printf("recv: %q\r\n", scanner.Text())
	}