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You can use a really nice package called rospy_message_converter:

Converts between Python dictionaries and JSON to ROS messages.

from there:

https://github.com/uos/rospy_message_converter

The main author is also very active on ROS Answers! :)

You can use a really nice package called rospy_message_converter:

Converts between Python dictionaries and JSON to ROS messages.

from there:

https://github.com/uos/rospy_message_converter

From the documentation:

• Convert a dictionary to a ROS message

  from rospy_message_converter import message_converter from std_msgs.msg import String dictionary = { 'data': 'Howdy' } message = message_converter.convert_dictionary_to_ros_message('std_msgs/String', dictionary)

• Convert a ROS message to a dictionary

  from rospy_message_converter import message_converter from std_msgs.msg import String message = String(data = 'Howdy') dictionary = message_converter.convert_ros_message_to_dictionary(message)

P.S. The main author is also very active on ROS Answers! :) :)