# Ack a previously sent ulog_stream message that had # the NEED_ACK flag set uint64 timestamp # time since system start (microseconds) int32 ACK_TIMEOUT = 50 # timeout waiting for an ack until we retry to send the message [ms] int32 ACK_MAX_TRIES = 50 # maximum amount of tries to (re-)send a message, each time waiting ACK_TIMEOUT ms uint16 msg_sequence