# EventV0 (UORB message)

this message is required here in the msg_old folder because other msg are depending on it
Events interface

[source file](https://github.com/PX4/PX4-Autopilot/blob/main/msg/px4_msgs_old/msg/EventV0.msg)

```c
# this message is required here in the msg_old folder because other msg are depending on it
# Events interface

uint32 MESSAGE_VERSION = 0

uint64 timestamp			# time since system start (microseconds)

uint32 id                   # Event ID
uint16 event_sequence       # Event sequence number
uint8[25] arguments         # (optional) arguments, depend on event id

uint8 log_levels            # Log levels: 4 bits MSB: internal, 4 bits LSB: external

uint8 ORB_QUEUE_LENGTH = 16

```