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You have a few options:

• You can use the ROS parameter server with the rosbridge according to this. The parameter server is more for setting parameters that do not change during the operation of the nodes.
• If you need the parameters to constantly change throughout operation then publishing a custom message with all your parameters in it should work. Or publishing multiple primitive types (ints, floats) to various subtopics such as /image_params/width and /image_params/height could work if the rosbridge doesn't allow custom messages.
• I would suggest dynamic reconfigure, but I'm not sure if rosbridge supports it