I'm using ROS in my project and I need to send one message from time to time. I have this function:
void RosNetwork::sendMessage(string msg, string channel) {
_mtx.lock();
ros::Publisher chatter_pub = _n.advertise<std_msgs::String>(channel.c_str(),10);
ros::Rate loop_rate(10);
std_msgs::String msgToSend;
msgToSend.data = msg.c_str();
chatter_pub.publish(msgToSend);
loop_rate.sleep();
cout << "Message Sent" << endl;
_mtx.unlock();
}
And I have this in python:
def callbackFirst(data):
#rospy.loginfo(rospy.get_caller_id() + "I heard %s", data.data)
print("Received message from first filter")
def callbackSecond(data):
#rospy.loginfo(rospy.get_caller_id() + "I heard %s", data.data)
print("Received message from second filter")
def listener():
rospy.Subscriber("FirstTaskFilter", String, callbackFirst)
print("subscribed to FirstTaskFilter")
rospy.Subscriber("SecondTaskFilter", String, callbackSecond)
print("subscribed to SecondTaskFilter")
rospy.spin()
The listener is a thread in python.
I get to the function sendMessage (I see in the terminal "Message Sent" a lot of times) but I don't see that the python script receives the message.
Update: I tested the python callback with rostopic pub /FirstTaskFilter std_msgs/String "test" and this works perfectly.
Any thought?
Originally posted by jdorfsman on ROS Answers with karma: 13 on 2015-08-04
Post score: 0
Original comments
Comment by mgruhler on 2015-08-04:
Well, what is the topic of the Publisher?
Check with rosnode info <YOUR_PUBLISHER_NODE> which topics it sends. I guess this is a simple remapping issue...
You can also visualize this with rosrun rqt_graph rqt_graph.