func readFreesizedSerialPortLoop(port *serial.Port, readpipe chan []byte) error {
readBuf := make([]byte, 256)
var sumBuf = []byte{}
readPointer := 0
defer port.Close()
for {
num, err := port.Read(readBuf)
if err == io.EOF {
// No more data comes
if readPointer > 0 {
log.Debugf("read data to send: %v", sumBuf)
readpipe <- sumBuf
readPointer = 0
sumBuf = []byte{}
log.Debugf("sumBuf cleared: %v", sumBuf)
}
continue
}
if err != nil {
return fmt.Errorf("cannnot open serial port: serialPort: %v, Error: %v", port, err)
}
if num > 0 {
readPointer += num
for index := range readBuf[:num] {
sumBuf = append(sumBuf, readBuf[index])
}
log.Debugf("read partial data: %v to sumBuf: %v", readBuf, sumBuf)
continue
}
}
}
// DisconnectRTU closes the underlying Serial Device connection
func DisconnectRTU(ctx *serial.Port) {
rtsDownChan <- cloasing
ctx.Close()
}