Use unique hex strings for new task IDs (#205)

Signed-off-by: Aaron Chong <[email protected]>
Signed-off-by: Charly Wu <[email protected]>

rmf_demos/launch/common.launch.xml

@@ -10,6 +10,7 @@
   <arg name="headless" default="false" description="do not launch rviz; launch gazebo in headless mode"/>
   <arg name="bidding_time_window" description="Time window in seconds for task bidding process" default="2.0"/>
   <arg name="use_rmf_panel" default="true" description="launch web and api server for rmf_demos_panel"/>
+  <arg name="use_unique_hex_string_with_task_id" default="true" description="Appends a unique hex string to the task ID"/>
 
   <!-- Traffic Schedule  -->
   <node pkg="rmf_traffic_ros2" exec="rmf_traffic_schedule" output="both" name="rmf_traffic_schedule_primary">
@@ -57,6 +58,7 @@
     <node pkg="rmf_task_ros2" exec="rmf_task_dispatcher"  output="screen">
       <param name="use_sim_time" value="$(var use_sim_time)"/>
       <param name="bidding_time_window" value="$(var bidding_time_window)"/>
+      <param name="use_unique_hex_string_with_task_id" value="$(var use_unique_hex_string_with_task_id)"/>
     </node>
   </group>