ROS message sent but not received

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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?