I have used the sample code for Sub a topic in python but however I am trying to subscribe a topic which gives out a the coordinates, image and etc in single data stream from rtabmap/graph topic. However doing this is just doesn't print out any msg at all. Do i need to convert the data into str or something cause all i need is the raw data in text?
#!/usr/bin/env python
import rospy
from std_msgs.msg import String
def callback(data):
rospy.loginfo(rospy.get_caller_id() + "I heard %s", data.data)
def listener():
# In ROS, nodes are uniquely named. If two nodes with the same
# node are launched, the previous one is kicked off. The
# anonymous=True flag means that rospy will choose a unique
# name for our 'listener' node so that multiple listeners can
# run simultaneously.
rospy.init_node('listener', anonymous=True)
rospy.Subscriber("rtabmap/graph", String, callback)
# spin() simply keeps python from exiting until this node is stopped
rospy.spin()
if __name__ == '__main__':
listener()
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