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I am currently working on a task that involves constant intercommunication between a web browser (using roslibjs) and the ROS system through the rosbridge server. Is there a way to send JSON-formatted data from the browser to a ROS node? I realize there is no JSON among the ROS system's standard data types.
(follow up to my comment)
If you want to send JSON encoded data as part of a message to a ROS node, then I don't believe there are any special provisions for that.
Most straightforward would probably be to define a new message that stores the JSON string in a field. Any receiving node will have to know it's JSON though.
Thanks, I found a way out. I was expecting JSON to be one of ROS's standard message types. Not the case. I simply wrote a JSON-format data, stringified it, and sent it as std_msgs type.
This will certainly work. However it's not recommended since you're completely avoiding the message datatype checks and all the introspection tools are unable to help you. As @gvdhoorn suggests the recommended way to do this would be to define a custom message to hold your data.
but what if you want that stringified data into json form in c++ side.
@AhteshamAziz Then you need the C++ equivalent of Javascript's JSON.parse() utility, which can construct JSON object from a JSON-formatted String.
Asked: 2017-11-05 13:10:20 -0600
Seen: 5,013 times
Last updated: Nov 21 '17
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I'm confused: if you are already using
roslibjsandrosbridge_suite, you are sending (and receiving) JSON data to (and from) ROS.Can you clarify what it is you actually want to do?