Reinitialize serial buffer on every read to avoid concurrent rewrite

buffered_ch was being rewritten with data being read on a later Read()

Attention: this implementation "leaks" (ch will be garbage collected every time)
Please profile the memory usage before merging

Author: facchinm

serialport.go

@@ -95,12 +95,13 @@ type SpPortMessageRaw struct {
 func (p *serport) reader() {
 
 	//var buf bytes.Buffer
-	ch := make([]byte, 1024)
 	timeCheckOpen := time.Now()
 	var buffered_ch bytes.Buffer
 
 	for {
 
+		ch := make([]byte, 1024)
+
 		n, err := p.portIo.Read(ch)
 
 		//if we detect that port is closing, break out o this for{} loop.
@@ -127,12 +128,9 @@ func (p *serport) reader() {
 			for i, w := 0, 0; i < n; i += w {
 				runeValue, width := utf8.DecodeRune(ch[i:n])
 				if runeValue == utf8.RuneError {
-					buffered_ch.Write(append(ch[i:n]))
+					buffered_ch.Write(ch[i:n])
 					break
 				}
-				if i == n {
-					buffered_ch.Reset()
-				}
 				data += string(runeValue)
 				w = width
 			}