# NONE

There are certain cases when the device you are simulating does not need to directly communicate with a server. It could be that you are just testing the functionality of the device, or it is an auxiliary device that connects to the server via a Gateway device. In these cases, you can use the NONE protocol which does not create a direct connection to any server.

![](https://1549501356-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LhKFvCh4dnxgthNTIuu%2Fuploads%2FvGzX3kKHfnGzqcs5XTTb%2FIFY_Protocol_NONE.png?alt=media\&token=85e1a436-8f1e-4c5e-94ca-ae2b170b5f17)

**Loopback**: The loopback setting allows you to receive whatever payload the Sender function sends into the Receiver function. This can be useful for testing the functionality of a device.