PX4-Autopilot/docs/en/msg_docs/UlogStream.md
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Signed-off-by: Ramon Roche <mrpollo@gmail.com>
Co-authored-by: Ramon Roche <mrpollo@gmail.com>
2025-03-13 16:08:27 +11:00

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Markdown

# UlogStream (UORB message)
Message to stream ULog data from the logger. Corresponds to the LOGGING_DATA
mavlink message
[source file](https://github.com/PX4/PX4-Autopilot/blob/main/msg/UlogStream.msg)
```c
# Message to stream ULog data from the logger. Corresponds to the LOGGING_DATA
# mavlink message
uint64 timestamp # time since system start (microseconds)
# flags bitmasks
uint8 FLAGS_NEED_ACK = 1 # if set, this message requires to be acked.
# Acked messages are published synchronous: a
# publisher waits for an ack before sending the
# next message
uint8 length # length of data
uint8 first_message_offset # offset into data where first message starts. This
# can be used for recovery, when a previous message got lost
uint16 msg_sequence # allows determine drops
uint8 flags # see FLAGS_*
uint8[249] data # ulog data
uint8 ORB_QUEUE_LENGTH = 16 # TODO: we might be able to reduce this if mavlink polled on the topic
```