rospy_message_converter json2ros

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Hi,

I'm trying to send a string msg after it will be converter by the library rospy_message_converter from JSON to ros. I need to send the message over the std_msgs/String type but with some sub-values in it. Like: under the data struct it will be:

        "name" : "Ben" 
         "age" : 15
         "weight": 50

I couldn't find any example of something like that. Again, I need to send this value by std_msgs/String and not with a custom msg.

This is what I tried:

from rospy_message_converter import json_message_converter
from std_msgs.msg import String
import rospy, json

if __name__ == "__main__":
rospy.init_node('api_test', anonymous=True)
name = 'Ben'
age = '15'

# json_str = '{"data": {}'.format('{"Engaged": {}}'.format(engaged))
json_str = '{"data": {"name": {0}}}'.format(name)

message = json_message_converter.convert_json_to_ros_message('std_msgs/String', json_str)
pub = rospy.Publisher("/pub",String, queue_size=1)
while not rospy.is_shutdown():
    pub.publish(message)
    rospy.sleep(0.5)

Thanks a lot, Aviad