I made a simple sub node with roscpp using ros kinetic on ubuntu 16.04. I have 2 computers on my network :

192.168.1.234 : Raspberry PI

ROS net config :

export ROS_IP=192.168.1.234

Result of ifconfig :

can0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00

          UP RUNNING NOARP  MTU:16  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

enxb827eb71bd25 Link encap:Ethernet  HWaddr b8:27:eb:71:bd:25  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:345 errors:0 dropped:0 overruns:0 frame:0
          TX packets:345 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:23349 (23.3 KB)  TX bytes:23349 (23.3 KB)

wlan0     Link encap:Ethernet  HWaddr b8:27:eb:24:e8:70  
          inet addr:192.168.1.234  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ee4b:a2a1:2c41:573b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:197 errors:0 dropped:38 overruns:0 frame:0
          TX packets:173 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:27509 (27.5 KB)  TX bytes:24228 (24.2 KB)

_Running node : _

roscore &
rosrun ros-ws Test

192.168.1.102 : Laptop

_ROS net config : _

export ROS_IP=192.168.1.102
export ROS_MASTER_URI="http://192.168.1.234:11311"

_Result of ifconfig : _

eno1      Link encap:Ethernet  HWaddr 3c:52:82:62:c9:0f  
          inet adr:192.168.1.102  Bcast:192.168.1.255  Masque:255.255.255.0
          adr inet6: fe80::303c:5b78:aff2:99b0/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:289050 erreurs:0 :9 overruns:0 frame:0
          TX packets:595541 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:80850321 (80.8 MB) Octets transmis:671744125 (671.7 MB)
          Interruption:20 Mémoire:f3100000-f3120000 

lo        Link encap:Boucle locale  
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          Packets reçus:441028 erreurs:0 :0 overruns:0 frame:0
          TX packets:441028 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:255498349 (255.4 MB) Octets transmis:255498349 (255.4 MB)

_Running node : _

rqt

---

The node run on the raspberry Pi and is launched through ssh by the laptop. I use RQT to debug this node. After building and launching, it's impossible for this node to receive messages from rqt.
I got the following warning at runtime on both terminals (PC and PI):

Couldn't find an AF_INET address for [my_hostname]

Just after launch I can send messages from the terminal on the Pi using rostopic pub and the node receive it.

But if I try to execute rqt and send messages on the same topic, the error appears. After that, messages from rostopic or rqt never reach the node. However rqt graph still show my node connected to the topic.

Here is my c++ sub code:

#include "ros/ros.h"
#include "std_msgs/String.h"

class Test
{
    public:
    Test(){
        test_subscriber = node.subscribe("/testSub", 1, &Test::testFunction, this);
    }

    void testFunction(const std_msgs::String::ConstPtr& msg) {
            ROS_INFO("test");
    }

    private:
    // Node
    ros::NodeHandle node;
    // Subscriber
    ros::Subscriber test_subscriber;
    // Internal variables
    std_msgs::String testMsgPub;
    int i;
};

int main(int argc, char **argv)
{
    // Node initialization
    ros::init(argc, argv, "test_node");
    // Balancing class Initialization
    Test testClass;
    // infinite loop starting
    ros::spin();
    return 0;
}

My CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.3)
project(test_pkg)

find_package(catkin REQUIRED
  std_msgs
  roscpp
)

catkin_package(
  CATKIN_DEPENDS roscpp
)

include_directories(
  include
  ${catkin_INCLUDE_DIRS}
  /lib:/usr/lib
  /usr/local/lib
)

add_executable(Test src/test.cpp)

## Specify libraries to link a library or executable target against
target_link_libraries(Test
${catkin_LIBRARIES}
)

and my package.xml:

<?xml version="1.0"?>
<package format="2">
  <name>test_pkg</name>
  <version>0.0.0</version>
  <description>The test_pkg package</description>

  <maintainer email="body@todo.todo">body</maintainer>

  <license>TODO</license>

  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>roscpp</build_depend>
  <build_depend>roslaunch</build_depend>
  <build_depend>std_msgs</build_depend>
  <build_export_depend>roscpp</build_export_depend>
  <build_export_depend>std_msgs</build_export_depend>
  <exec_depend>roscpp</exec_depend>
  <exec_depend>std_msgs</exec_depend>

  <export>

  </export>
</package>