/usr/share/sensor_msgs/msg/LaserEcho.msg is in libsensor-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # This message is a submessage of MultiEchoLaserScan and is not intended
# to be used separately.
float32[] echoes # Multiple values of ranges or intensities.
# Each array represents data from the same angle increment.
|