Convert UTF-8 Go strings to ASCII bytes.

string_to_ascii.go

package main

import (
	"unicode/utf8"
)

// Fake converting UTF-8 internal string representation to standard
// ASCII bytes for serial connections.
func StringToAsciiBytes(s string) []byte {
	t := make([]byte, utf8.RuneCountInString(s))
	i := 0
	for _, r := range s {
		t[i] = byte(r)
		i++
	}
	return t
}

Thanks for the correction, @quite ❤️