Added basic multidevice support

config.go

@@ -19,13 +19,16 @@ type Config struct {
 		LogDir   string
 	}
 
-	Device struct {
-		Address  string
-		Port     int
-		Username string
-		Password string
-		Timeout  int
-	}
+	Devices []Device
+}
+
+type Device struct {
+	Name     string
+	Address  string
+	Port     int
+	Username string
+	Password string
+	Timeout  int
 }
 
 func readConfig() (config Config, err error) {