{"action":"created","issue":{"url":"https://api.github.com/repos/mavlink/mavros/issues/492","repository_url":"https://api.github.com/repos/mavlink/mavros","labels_url":"https://api.github.com/repos/mavlink/mavros/issues/492/labels{/name}","comments_url":"https://api.github.com/repos/mavlink/mavros/issues/492/comments","events_url":"https://api.github.com/repos/mavlink/mavros/issues/492/events","html_url":"https://github.com/mavlink/mavros/issues/492","id":131031428,"number":492,"title":"launching Gazebo with ROS wrappers -> No startup of px4 app","user":{"login":"gokoreas","id":5248102,"avatar_url":"https://avatars.githubusercontent.com/u/5248102?v=3","gravatar_id":"","url":"https://api.github.com/users/gokoreas","html_url":"https://github.com/gokoreas","followers_url":"https://api.github.com/users/gokoreas/followers","following_url":"https://api.github.com/users/gokoreas/following{/other_user}","gists_url":"https://api.github.com/users/gokoreas/gists{/gist_id}","starred_url":"https://api.github.com/users/gokoreas/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gokoreas/subscriptions","organizations_url":"https://api.github.com/users/gokoreas/orgs","repos_url":"https://api.github.com/users/gokoreas/repos","events_url":"https://api.github.com/users/gokoreas/events{/privacy}","received_events_url":"https://api.github.com/users/gokoreas/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/mavlink/mavros/labels/question","name":"question","color":"cc317c"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":16,"created_at":"2016-02-03T13:48:30Z","updated_at":"2016-02-06T01:47:16Z","closed_at":null,"body":"Following the [tutorials](http://dev.px4.io/simulation-ros-interface.html),\r\n\r\nAfter launching gazebo using\r\n` roslaunch gazebo_ros empty_world.launch `\r\n\r\n\r\nI have added the IRIS model. However, the PX4 sitl app doesn't seem to startup as MAVROS cannot connect to the fcu using\r\n\r\n`roslaunch mavros px4.launch fcu_url:=\"udp://:14540@127.0.0.1:14557\"`\r\n\r\nAm I doing something wrong?"},"comment":{"url":"https://api.github.com/repos/mavlink/mavros/issues/comments/180653984","html_url":"https://github.com/mavlink/mavros/issues/492#issuecomment-180653984","issue_url":"https://api.github.com/repos/mavlink/mavros/issues/492","id":180653984,"user":{"login":"gokoreas","id":5248102,"avatar_url":"https://avatars.githubusercontent.com/u/5248102?v=3","gravatar_id":"","url":"https://api.github.com/users/gokoreas","html_url":"https://github.com/gokoreas","followers_url":"https://api.github.com/users/gokoreas/followers","following_url":"https://api.github.com/users/gokoreas/following{/other_user}","gists_url":"https://api.github.com/users/gokoreas/gists{/gist_id}","starred_url":"https://api.github.com/users/gokoreas/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gokoreas/subscriptions","organizations_url":"https://api.github.com/users/gokoreas/orgs","repos_url":"https://api.github.com/users/gokoreas/repos","events_url":"https://api.github.com/users/gokoreas/events{/privacy}","received_events_url":"https://api.github.com/users/gokoreas/received_events","type":"User","site_admin":false},"created_at":"2016-02-06T01:47:16Z","updated_at":"2016-02-06T01:47:16Z","body":"@andre-nguyen  I have solved the problem\r\n\r\nI have found out that it should not be \r\n```\r\nnosim=1 make posix_sitl_default gazebo\r\n```\r\nbut\r\n\r\n```\r\nno_sim=1 make posix_sitl_default gazebo\r\n``` \r\n\r\nThis will be great help for me in my research! Thank you!"}}