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# TimesyncStatus (UORB message)

**TOPICS:** timesync_status

## Fields

| Name             | Type     | Unit [Frame] | Range/Enum | Description                                                                |
| ---------------- | -------- | ------------ | ---------- | -------------------------------------------------------------------------- |
| timestamp        | `uint64` |              |            | time since system start (microseconds)                                     |
| source_protocol  | `uint8`  |              |            | timesync source                                                            |
| remote_timestamp | `uint64` |              |            | remote system timestamp (microseconds)                                     |
| observed_offset  | `int64`  |              |            | raw time offset directly observed from this timesync packet (microseconds) |
| estimated_offset | `int64`  |              |            | smoothed time offset between companion system and PX4 (microseconds)       |
| round_trip_time  | `uint32` |              |            | round trip time of this timesync packet (microseconds)                     |

## Constants

| Name                                                          | Type    | Value | Description |
| ------------------------------------------------------------- | ------- | ----- | ----------- |
| <a id="#SOURCE_PROTOCOL_UNKNOWN"></a> SOURCE_PROTOCOL_UNKNOWN | `uint8` | 0     |
| <a id="#SOURCE_PROTOCOL_MAVLINK"></a> SOURCE_PROTOCOL_MAVLINK | `uint8` | 1     |
| <a id="#SOURCE_PROTOCOL_DDS"></a> SOURCE_PROTOCOL_DDS         | `uint8` | 2     |

## Source Message

[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/TimesyncStatus.msg)

::: details Click here to see original file

```c
uint64 timestamp			# time since system start (microseconds)

uint8 SOURCE_PROTOCOL_UNKNOWN = 0
uint8 SOURCE_PROTOCOL_MAVLINK = 1
uint8 SOURCE_PROTOCOL_DDS     = 2
uint8 source_protocol			# timesync source

uint64 remote_timestamp			# remote system timestamp (microseconds)
int64 observed_offset			# raw time offset directly observed from this timesync packet (microseconds)
int64 estimated_offset			# smoothed time offset between companion system and PX4 (microseconds)
uint32 round_trip_time			# round trip time of this timesync packet (microseconds)
```

:::
