# GroundLinkMessageType

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Reference](https://developer.m-files.com/APIs/gRPC-API/Reference/index.md) > [Enums](https://developer.m-files.com/APIs/gRPC-API/Reference/Enums/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/Enums/MFiles.GroundLinkMessageType/

Types of .NET remoting messages.

- **Full name:** `MFiles.GroundLinkMessageType`
- **Proto file:** [`mfiles/IRPCGroundLink.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/IRPCGroundLink.proto)

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## Values

| Name | Number | Description |
|---|---|---|
| <a id="v-REQUEST"></a>`REQUEST` | 0 | For method calls. |
| <a id="v-RESPONSE"></a>`RESPONSE` | 1 | For method returns. |

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## Used by methods

- [IRPCGroundLink.OpenGroundLinkChannel](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCGroundLink/OpenGroundLinkChannel/index.md): Opens a bi-directional Ground Link channel between the client and server.

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## Used in fields

- [`GroundLinkMessage.type`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCGroundLink/OpenGroundLinkChannel/index.md#request): Whether the message is a call (`REQUEST`) or the return of a call (`RESPONSE`).