参考:https://answers.ros.org/question/261071/rviz-client-md5sum-error/
[ERROR] [1563347805.272316618]: Client [/rviz] wants topic /submap_list to have datatype/md5sum [cartographer_ros_msgs/SubmapList/5b078c8c78f691214539bd5c73670511], but our version has [cartographer_ros_msgs/SubmapList/6efe809c4a0e69266aa99b3bea531f2a]. Dropping connection.
找到从机cartographer里面的SubmapList.h文件
然后找到md5sum 如下图所示
将5b078c8c78f691214539bd5c73670511替换为 6efe809c4a0e69266aa99b3bea531f2a
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