// serial read, we run this in a goroutine so we can block on read
// on data read send through the channel
func serialRead(p *serial.Port, ch chan []byte) {
buf := make([]byte, 256)
for {
n, err := p.Read(buf)
if err != nil && err != io.EOF {
log.Fatal(err)
}
if n > 0 {
ch <- buf[:n]
}
}
}
