Linux 终端rostopic pub消息

查询要发送的数据格式：

赋值发送：

rostopic pub -1 /cmd_vel geometry_msgs/Twist "
linear:
  x: 1.0
  y: 1.0
  z: 1.0
angular:
  x: 1.0
  y: 1.0
  z: 1.0"

 -1发一次，-r以帧率重复发送

rostopic pub -r 1 /cloud_point_ai std_msgs/UInt8MultiArray "
layout:
  dim: []
  data_offset: 0
data:  [120, 12, 37, 205, 166, 204, 216, 65, 24,0,1,21,0,1,229,92,157,62,109,8,97,0,109,8,104,255,103,9,104,255,103,9,97,0]
"