{"action":"opened","issue":{"url":"https://api.github.com/repos/ros/ros_comm/issues/638","labels_url":"https://api.github.com/repos/ros/ros_comm/issues/638/labels{/name}","comments_url":"https://api.github.com/repos/ros/ros_comm/issues/638/comments","events_url":"https://api.github.com/repos/ros/ros_comm/issues/638/events","html_url":"https://github.com/ros/ros_comm/issues/638","id":95195133,"number":638,"title":"More customization allowable relay command line tool","user":{"login":"wkentaro","id":4310419,"avatar_url":"https://avatars.githubusercontent.com/u/4310419?v=3","gravatar_id":"","url":"https://api.github.com/users/wkentaro","html_url":"https://github.com/wkentaro","followers_url":"https://api.github.com/users/wkentaro/followers","following_url":"https://api.github.com/users/wkentaro/following{/other_user}","gists_url":"https://api.github.com/users/wkentaro/gists{/gist_id}","starred_url":"https://api.github.com/users/wkentaro/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wkentaro/subscriptions","organizations_url":"https://api.github.com/users/wkentaro/orgs","repos_url":"https://api.github.com/users/wkentaro/repos","events_url":"https://api.github.com/users/wkentaro/events{/privacy}","received_events_url":"https://api.github.com/users/wkentaro/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-07-15T13:31:10Z","updated_at":"2015-07-15T13:31:10Z","closed_at":null,"body":"I'd like to relay topics with changes of msg type like below.\r\n```\r\n$ rosrun rospy_tutorials talker\r\n\r\n# THIS IS MAIN >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\r\n$ rosrun topic_tools relay_field /chatter /image sensor_msgs/Image \"header:\r\n  seq: 0\r\n  stamp: {secs: 0, nsecs: 0}\r\n  frame_id: 'm.data'\r\nheight: 0\r\nwidth: 0\r\nencoding: ''\r\nis_bigendian: 0\r\nstep: 0\r\ndata: ''\"\r\n# THIS IS MAIN <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\r\n\r\n$ rostopic echo /image\r\n header:\r\n  seq: 0\r\n  stamp: {secs: 0, nsecs: 0}\r\n  frame_id: 'hello world 1436966790.72'\r\nheight: 0\r\nwidth: 0\r\nencoding: ''\r\nis_bigendian: 0\r\nstep: 0\r\ndata: ''\r\n...\r\n```\r\nIs this kind of feature already implemented in topic_tools of ros_comm?\r\nOr should I implement this as new tool?"}}