# Protocol Documentation
<a name="top"></a>

## Table of Contents

- [app.proto](#app-proto)
    - [AppData](#app-AppData)
    - [Error](#app-Error)
    - [Event](#app-Event)
    - [Subscription](#app-Subscription)
  
    - [Application](#app-Application)
  
- [Scalar Value Types](#scalar-value-types)



<a name="app-proto"></a>
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## app.proto



<a name="app-AppData"></a>

### AppData



| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| subscription | [Subscription](#app-Subscription) |  |  |
| heartbeat | [common.Empty](#common-Empty) |  |  |
| error | [Error](#app-Error) |  |  |






<a name="app-Error"></a>

### Error



| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| drone_id | [string](#string) |  |  |
| error | [common.Error](#common-Error) |  |  |






<a name="app-Event"></a>

### Event



| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| drone_id | [string](#string) |  |  |
| data | [bytes](#bytes) |  |  |






<a name="app-Subscription"></a>

### Subscription



| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| id | [string](#string) |  |  |
| name | [string](#string) |  |  |





 

 

 


<a name="app-Application"></a>

### Application


| Method Name | Request Type | Response Type | Description |
| ----------- | ------------ | ------------- | ------------|
| Subscribe | [AppData](#app-AppData) stream | [Event](#app-Event) stream |  |

 



## Scalar Value Types

| .proto Type | Notes | C++ | Java | Python | Go | C# | PHP | Ruby |
| ----------- | ----- | --- | ---- | ------ | -- | -- | --- | ---- |
| <a name="double" /> double |  | double | double | float | float64 | double | float | Float |
| <a name="float" /> float |  | float | float | float | float32 | float | float | Float |
| <a name="int32" /> int32 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead. | int32 | int | int | int32 | int | integer | Bignum or Fixnum (as required) |
| <a name="int64" /> int64 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead. | int64 | long | int/long | int64 | long | integer/string | Bignum |
| <a name="uint32" /> uint32 | Uses variable-length encoding. | uint32 | int | int/long | uint32 | uint | integer | Bignum or Fixnum (as required) |
| <a name="uint64" /> uint64 | Uses variable-length encoding. | uint64 | long | int/long | uint64 | ulong | integer/string | Bignum or Fixnum (as required) |
| <a name="sint32" /> sint32 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. | int32 | int | int | int32 | int | integer | Bignum or Fixnum (as required) |
| <a name="sint64" /> sint64 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. | int64 | long | int/long | int64 | long | integer/string | Bignum |
| <a name="fixed32" /> fixed32 | Always four bytes. More efficient than uint32 if values are often greater than 2^28. | uint32 | int | int | uint32 | uint | integer | Bignum or Fixnum (as required) |
| <a name="fixed64" /> fixed64 | Always eight bytes. More efficient than uint64 if values are often greater than 2^56. | uint64 | long | int/long | uint64 | ulong | integer/string | Bignum |
| <a name="sfixed32" /> sfixed32 | Always four bytes. | int32 | int | int | int32 | int | integer | Bignum or Fixnum (as required) |
| <a name="sfixed64" /> sfixed64 | Always eight bytes. | int64 | long | int/long | int64 | long | integer/string | Bignum |
| <a name="bool" /> bool |  | bool | boolean | boolean | bool | bool | boolean | TrueClass/FalseClass |
| <a name="string" /> string | A string must always contain UTF-8 encoded or 7-bit ASCII text. | string | String | str/unicode | string | string | string | String (UTF-8) |
| <a name="bytes" /> bytes | May contain any arbitrary sequence of bytes. | string | ByteString | str | []byte | ByteString | string | String (ASCII-8BIT) |