add new ip ping for udp device

add new function start and stop bus

cfg/cfg.go

@@ -1,7 +1,6 @@
 package cfg
 
 import (
-	"fmt"
 	"os"
 	"path"
 
@@ -51,7 +50,7 @@ func (c *Cfg) SaveCfg(data any) error {
 func (c *Cfg) LoadCfg(data any) error {
 	p := path.Join(c.Dir, c.Name) + ".cfg"
 	if _, err := os.Stat(p); err != nil {
-		return fmt.Errorf("no configuration file: '%s' found", p)
+		return nil
 	}
 
 	b, err := os.ReadFile(p)