px4-firmware/msg/ulog_stream.msg

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# 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 = 14 # TODO: we might be able to reduce this if mavlink polled on the topic