How to solve "Couldn't find an AF_INET address for " problem

edit

The only solution that worked for me was to list the ip address of each computer along with its hostname to the /etc/hosts file.

Or just set on every computer in you network (so you don't have to thing about addresses):

export ROS_IP=`hostname -I`

Or even, sometimes better, solution is to add this line in your .bashrc file.

I found a way, change your /etc/hosts Such as:

vim /etc/hosts

then add your ip:

192.168.3.5   my_hostname

I would say the best answer... worked 100% for my robot and local computers. have a look... http://www.umiacs.umd.edu/~cteo/umd-e...

If this is coming from a gazebo plugin -- it may be because gazebo is beignn run standalone rather than launched from ros as required.

MultipleMachines

I had same problem while ı am trying the upper link. I resolved, resolve is here.

open the .bashrc files and add this code.

You'll see those things like that:

export ROS_MASTER_URI=http://localhost (or something like that which is not your ip):11311
export ROS_HOSTNAME=(your machine name)

and you must change it like that:

export ROS_MASTER_URI=http://30.10.21.46:11311
export ROS_HOSTNAME=30.10.21.46

change your ip adress.

Deluxe Version for Bash with multiple interfaces

function set_rosip
{
  RED="$(tput setb 4)"
  GREEN="$(tput setaf 0)$(tput setb 2)"
  BOLD=$(tput bold)
  NOCOLOR=$(tput sgr0)

  {
  ifconfig $1
  } &> /dev/null


  if [ $? -ne 0 ]; then
    echo -e "${RED}Interface ${BOLD}$1${NOCOLOR}${RED} not found! ${BOLD}ROS_IP not set!${NOCOLOR}"
    return 1
  fi

  ip_addr=`ifconfig $1 | grep 'inet addr:' | cut -d: -f2 | awk '{print $1}'`

  if [ -z "$ip_addr" ]; then
    if [ "$3" == "1" ]; then
      echo -e "${RED}Interface ${BOLD}$1${NOCOLOR}${RED} not connected, ${BOLD}ROS_IP not set!${NOCOLOR}"
    fi
    return 1
  fi

  if [ "$2" == "1" ]; then
    echo ${GREEN}ROS_IP set to $1 with IP $ip_addr${NOCOLOR}
  fi


  export ROS_IP=$ip_addr
}
#Tries to get setup ROS_IP in the specified order and stops on the first success ... 
set_rosip wlan0 1 0 || set_rosip eth0 1 1 \
# ||  set_rosip ${anotherinterface} ${printonsuccess} ${printonfail}

If you want only be notified if the last one fails:

set_rosip wlan0 0 0 || set_rosip eth0 0 1