fix bug

services/devicemanager/manager.go

@@ -31,7 +31,6 @@ func (dm *DeviceManager) GenerateDeviceAccessToken(args rpcs.ArgsGenerateDeviceA
 }
 
 func (dm *DeviceManager) ValidateDeviceAccessToken(args rpcs.ArgsValidateDeviceAccessToken, reply *rpcs.ReplyValidateDeviceAccessToken) error {
-	dm.onlineManager.SetHeartbeat(args.Id)
 	return dm.tokenHelper.ValidateToken(args.Id, args.AccessToken)
 }