{"action":"created","issue":{"url":"https://api.github.com/repos/ros2/design/issues/57","labels_url":"https://api.github.com/repos/ros2/design/issues/57/labels{/name}","comments_url":"https://api.github.com/repos/ros2/design/issues/57/comments","events_url":"https://api.github.com/repos/ros2/design/issues/57/events","html_url":"https://github.com/ros2/design/issues/57","id":106389612,"number":57,"title":"Write parameters design document","user":{"login":"tfoote","id":447804,"avatar_url":"https://avatars.githubusercontent.com/u/447804?v=3","gravatar_id":"","url":"https://api.github.com/users/tfoote","html_url":"https://github.com/tfoote","followers_url":"https://api.github.com/users/tfoote/followers","following_url":"https://api.github.com/users/tfoote/following{/other_user}","gists_url":"https://api.github.com/users/tfoote/gists{/gist_id}","starred_url":"https://api.github.com/users/tfoote/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tfoote/subscriptions","organizations_url":"https://api.github.com/users/tfoote/orgs","repos_url":"https://api.github.com/users/tfoote/repos","events_url":"https://api.github.com/users/tfoote/events{/privacy}","received_events_url":"https://api.github.com/users/tfoote/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/ros2/design/labels/in%20review","name":"in review","color":"c7def8"}],"state":"open","locked":false,"assignee":{"login":"tfoote","id":447804,"avatar_url":"https://avatars.githubusercontent.com/u/447804?v=3","gravatar_id":"","url":"https://api.github.com/users/tfoote","html_url":"https://github.com/tfoote","followers_url":"https://api.github.com/users/tfoote/followers","following_url":"https://api.github.com/users/tfoote/following{/other_user}","gists_url":"https://api.github.com/users/tfoote/gists{/gist_id}","starred_url":"https://api.github.com/users/tfoote/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tfoote/subscriptions","organizations_url":"https://api.github.com/users/tfoote/orgs","repos_url":"https://api.github.com/users/tfoote/repos","events_url":"https://api.github.com/users/tfoote/events{/privacy}","received_events_url":"https://api.github.com/users/tfoote/received_events","type":"User","site_admin":false},"milestone":null,"comments":4,"created_at":"2015-09-14T17:23:01Z","updated_at":"2015-10-29T19:15:07Z","closed_at":null,"body":"Create a design document for the parameter system. "},"comment":{"url":"https://api.github.com/repos/ros2/design/issues/comments/152291462","html_url":"https://github.com/ros2/design/issues/57#issuecomment-152291462","issue_url":"https://api.github.com/repos/ros2/design/issues/57","id":152291462,"user":{"login":"tfoote","id":447804,"avatar_url":"https://avatars.githubusercontent.com/u/447804?v=3","gravatar_id":"","url":"https://api.github.com/users/tfoote","html_url":"https://github.com/tfoote","followers_url":"https://api.github.com/users/tfoote/followers","following_url":"https://api.github.com/users/tfoote/following{/other_user}","gists_url":"https://api.github.com/users/tfoote/gists{/gist_id}","starred_url":"https://api.github.com/users/tfoote/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tfoote/subscriptions","organizations_url":"https://api.github.com/users/tfoote/orgs","repos_url":"https://api.github.com/users/tfoote/repos","events_url":"https://api.github.com/users/tfoote/events{/privacy}","received_events_url":"https://api.github.com/users/tfoote/received_events","type":"User","site_admin":false},"created_at":"2015-10-29T19:15:07Z","updated_at":"2015-10-29T19:15:07Z","body":"@vooon Supporting setting the parameter on an external device as you mention would work fine. In your drawing though both the setting and getting from the main ROS system would go to the node cache, and it would talk to the device. I'd suggest considering it more of a proxy for the device, in the realm of a device driver rather than a peer. "}}