px4-firmware/msg/tune_control.msg

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# This message is used to control the tunes, when the tune_id is set to CUSTOM
# then the frequency, duration are used otherwise those values are ignored.
uint64 timestamp # time since system start (microseconds)
uint8 tune_id # tune_id corresponding to TuneID::* from the tune_defaults.h in the tunes library
uint8 tune_override # if set to 1 the tune which is playing will be stopped and the new started
uint16 frequency # in Hz
uint32 duration # in us
uint32 silence # in us
uint8 volume # value between 0-100 if supported by backend
uint8 VOLUME_LEVEL_MIN = 0
uint8 VOLUME_LEVEL_DEFAULT = 40
uint8 VOLUME_LEVEL_MAX = 100
uint8 ORB_QUEUE_LENGTH = 3