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As you are spawning the robots successfully, i think you can define namespace of each bot in the launch file separately. Having done this you should publish the cmd_vel to each bot with separate topics which get created according to their namespace in launch file. Below is example of launch file i used.

<launch>    
    <group ns="Robot">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.7"/>
        </node>
    </group>
    <group ns="Obstacle2">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.6"/>
        </node>
    </group>
</launch>

And publishers as below

robot_vel_pub = n.advertise<geometry_msgs::Twist>("Robot/rosaria/cmd_vel", 1000);
obs1_vel_pub = n.advertise<<geometry_msgs::Twist>("Obstacle1/rosaria/cmd_vel", 1000);

As you are spawning the robots successfully, i think you can define namespace of each bot in the launch file separately. Having done this you should publish the cmd_vel to each bot with separate topics which get created according to their namespace in launch file. Below is example of launch file i used.

<launch>    
    <group ns="Robot">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.7"/>
        </node>
    </group>
    <group ns="Obstacle2">
ns="Obstacle1">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.6"/>
        </node>
    </group>
</launch>

And publishers as below

robot_vel_pub = n.advertise<geometry_msgs::Twist>("Robot/rosaria/cmd_vel", 1000);
obs1_vel_pub = n.advertise<<geometry_msgs::Twist>("Obstacle1/rosaria/cmd_vel", 1000);

As you are spawning the robots successfully, i think you can define namespace of each bot in the launch file separately. Having done this you should publish the cmd_vel to each bot with separate topics which get created according to their namespace in launch file. Below is example of launch file i used.

<launch>    
    <group ns="Robot">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.7"/>
        </node>
    </group>
    <group ns="Obstacle1">
        <node pkg="velocity_obstacle" name="rosaria" type="robot_node" output="screen">
        <param name="port" value="10.2.36.6"/>
        </node>
    </group>
</launch>

And publishers as below

robot_vel_pub = n.advertise<geometry_msgs::Twist>("Robot/rosaria/cmd_vel", 1000);
obs1_vel_pub = n.advertise<<geometry_msgs::Twist>("Obstacle1/rosaria/cmd_vel", 1000);

<group ns="XXX">
      <param xxxxxxxxxxxxxxxxx /> #param closed here
      <node xxxxxxxxxxxxxxxxxx /> #node closed here
      <node xxxxxxxxxxxxxxxxxx /> #node closed here
</group> #group closed here

<group ns="XXX>
      <node xxxxxxxxxxxxxxxxxx> #node not closed here
      <param xxxxxxxxxxxxxxxxx /> #param closed here but still in node which is not closed
      </node> #node closed here
</group> #group closed here