How to get robot_state_publisher to take the information from my /joint_states topic.

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I have a very simple problem which is to set the joint positions of my URDF hand by code, see the figure bellow. First I have been trying to do this via the terminal but without any success.

What have have done in code is to publish the joint positions to the topic /joint_states and not used the default joint_state_publisher node. But I have not been successful.

Here us my launch file:

<?xml version="1.0"?>
<launch>

   <arg name="gui" default="False" />
   <param name="robot_description" command="...'" />
   <param name="use_gui" value="$(arg gui)"/>

   <node name="robot_state_publisher" pkg="robot_state_publisher" type="state_publisher"/>

   <!-- hand model -->
   <node name="hand_model" pkg="sensor_models" type="hand_node" />
   <node name="rviz" pkg="rviz" type="rviz"  required="true" />

</launch>

My hand node publishes the joint states on the topic /joint_states

$ rostopic info /joint_states 
Type: sensor_msgs/JointState

Publishers: 
 * /hand_model (http://128.178.145.74:39519/)

Subscribers: 
 * /robot_state_publisher (http://128.178.145.74:36845/)

When I check the messages being published rostopic echo /joint_states:

 seq: 23721
  stamp: 
    secs: 0
    nsecs: 0
  frame_id: ''
name: ['index_dof0_joint', 'index_dof1_joint', 'index_dof2_joint', 'index_dof3_joint', 'middle_dof0_joint', 'middle_dof1_joint', 'middle_dof2_joint', 'middle_dof3_joint', 'ring_dof0_joint', 'ring_dof1_joint', 'ring_dof2_joint', 'ring_dof3_joint', 'pinky_dof0_joint', 'pinky_dof1_joint', 'pinky_dof2_joint', 'pinky_dof3_joint', 'thumb_dof0_joint', 'thumb_dof1_joint', 'thumb_dof2_joint']
position: [0.47, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
velocity: []
effort: []

I have exactly the same information if I used:

 <node name="joint_state_publisher" pkg="joint_state_publisher" type="joint_state_publisher">

instead of publishing it from my hand_model node. This is what I get:

I am unsure how to get robot_state_publisher to take the information from the /joint_states topic. Any ideas ?