Removed the serial_no parameter as argument to the launch file.

launch/realsense.launch

@@ -6,14 +6,12 @@
   <arg name="tf_prefix" default=""/>
   <arg name="output" default="log"/>
   <arg name="launch_prefix" default=""/>
-  <arg name="serial_no" default=""/>
   <arg name="manager" default="$(arg camera_name)_manager"/>
 
   <group ns="$(arg camera_name)">
     <node pkg="nodelet" type="nodelet" name="$(arg manager)" args="manager" output="$(arg output)" launch-prefix="$(arg launch_prefix)"/>
     <node pkg="nodelet" type="nodelet" name="realsense2_camera" args="load realsense2_camera/RealSenseNodeFactory $(arg manager)">
       <rosparam file="$(arg config_file)" command="load" />
-      <param name="serial_no"                type="str"  value="$(arg serial_no)"/>
       <param name="base_frame_id"            type="str"  value="$(arg tf_prefix)/$(arg camera_name)_link"/>
       <param name="depth_frame_id"           type="str"  value="$(arg tf_prefix)/$(arg camera_name)_depth_frame"/>
       <param name="infra1_frame_id"          type="str"  value="$(arg tf_prefix)/$(arg camera_name)_infra1_frame"/>