add network feature for relay

internal/util/serial/serial.go

@@ -0,0 +1,50 @@
+package serial
+
+import (
+	"strconv"
+	"strings"
+
+	goserial "github.com/tarm/serial"
+)
+
+const (
+	DefaultPort     = "COM1"
+	DefaultBaudRate = 9600
+	DefaultParity   = "none"
+)
+
+// COM1,9600,odd
+func ParseConfigFromAddr(addr string) *goserial.Config {
+	cfg := &goserial.Config{
+		Name: DefaultPort,
+		Baud: DefaultBaudRate,
+	}
+	ss := strings.Split(addr, ",")
+	switch len(ss) {
+	case 1:
+		cfg.Name = ss[0]
+	case 2:
+		cfg.Name = ss[0]
+		cfg.Baud, _ = strconv.Atoi(ss[1])
+	case 3:
+		cfg.Name = ss[0]
+		cfg.Baud, _ = strconv.Atoi(ss[1])
+		cfg.Parity = parseParity(ss[2])
+	}
+	return cfg
+}
+
+func parseParity(s string) goserial.Parity {
+	switch strings.ToLower(s) {
+	case "o", "odd":
+		return goserial.ParityOdd
+	case "e", "even":
+		return goserial.ParityEven
+	case "m", "mark":
+		return goserial.ParityMark
+	case "s", "space":
+		return goserial.ParitySpace
+	default:
+		return goserial.ParityNone
+	}
+}