/usr/share/visualization_msgs/msg/InteractiveMarkerInit.msg is in libvisualization-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 6 7 8 9 10 11 12 13 14 | # Identifying string. Must be unique in the topic namespace
# that this server works on.
string server_id
# Sequence number.
# The client will use this to detect if it has missed a subsequent
# update. Every update message will have the same sequence number as
# an init message. Clients will likely want to unsubscribe from the
# init topic after a successful initialization to avoid receiving
# duplicate data.
uint64 seq_num
# All markers.
InteractiveMarker[] markers
|