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# Ping (UORB message)

**TOPICS:** ping

## Fields

| Name            | Type      | Unit [Frame] | Range/Enum | Description                            |
| --------------- | --------- | ------------ | ---------- | -------------------------------------- |
| timestamp       | `uint64`  |              |            | time since system start (microseconds) |
| ping_time       | `uint64`  |              |            | Timestamp of the ping packet           |
| ping_sequence   | `uint32`  |              |            | Sequence number of the ping packet     |
| dropped_packets | `uint32`  |              |            | Number of dropped ping packets         |
| rtt_ms          | `float32` |              |            | Round trip time (in ms)                |
| system_id       | `uint8`   |              |            | System ID of the remote system         |
| component_id    | `uint8`   |              |            | Component ID of the remote system      |

## Source Message

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

::: details Click here to see original file

```c
uint64 timestamp			# time since system start (microseconds)
uint64 ping_time			# Timestamp of the ping packet
uint32 ping_sequence		# Sequence number of the ping packet
uint32 dropped_packets		# Number of dropped ping packets
float32 rtt_ms				# Round trip time (in ms)
uint8 system_id				# System ID of the remote system
uint8 component_id			# Component ID of the remote system
```

:::