Using Simulation.addMote(..) and Simulation.removeMote(..) but crashed.

[iPAS]

Dear,
I used your Realsim code to study how to imitate death and rebirth of node in Cooja plugin.
In my plugin, I try Simulation.removeMote(..) and Simulation.addMote(..)
as same as being used in Realsim.
But, the Cooja always crashed after Simulation.addMote(..) was called.
The "illegalArguementException: Jumping to a time that is further than possible in LPM max cycles..."
was thrown.
If you have any clue or suggestion please guild me.
Thank you.

[cmorty]

Yea, I remember having those issues, too, but I can't remember whether I worked around them or fixed the issue. I do remember adding some patches to Cooja to solve issues with adding nodes using plugins. Especially having a list of uninitialized nodes. Yet unless you have a old (>2y) version of Cooja those should be fixed. Did you try stopping the simulation before adding the nodes?

[iPAS]

Thanks @cmorty.
I have not tried to stop the simulation yet,
but already found the reason why crash occurred when adding a mote via Simulation.addMote()
after removing the mote.
It is because the logObserver is set to be null in the process of Simulation.removeMote().
So, I patched COOJA as the following code.

--- tools/cooja/java/org/contikios/cooja/interfaces/Mote2MoteRelations.java ---
index eb3a2f7..a28b27b 100644
@@ -135,7 +135,7 @@ public class Mote2MoteRelations extends MoteInterface {
         ((Log)mi).deleteObserver(logObserver);
       }
     }
-    logObserver = null;
+    //logObserver = null;  // [iPAS]: Why do we need to destroy it?
 
     /* Remove all relations to other motes */
     Mote[] relationsArr = relations.toArray(new Mote[0]);

----- tools/cooja/java/org/contikios/cooja/interfaces/MoteAttributes.java -----
index b2ff1b3..69c75d2 100644
@@ -114,7 +114,7 @@ public class MoteAttributes extends MoteInterface {
         ((Log)mi).deleteObserver(logObserver);
       }
     }
-    logObserver = null;
+    //logObserver = null;  // [iPAS]: Why do we need to destroy it? 
   }

The mote could be added correctly;
however, the other crash -- as I mentioned in my first post -- still occur.

java.lang.IllegalArgumentException: Jumping to a time that is further than possible in LPM maxCycles:231383624 cycles: 156073888 nextEventCycles: 156091473
	at se.sics.mspsim.core.MSP430.stepMicros(MSP430.java:236)
	at org.contikios.cooja.mspmote.MspMote.execute(MspMote.java:337)
	at org.contikios.cooja.mspmote.MspMoteTimeEvent.execute(MspMoteTimeEvent.java:53)
	at org.contikios.cooja.mspmote.interfaces.MspSerial$2.execute(MspSerial.java:82)
	at org.contikios.cooja.Simulation.run(Simulation.java:281)
	at java.lang.Thread.run(Thread.java:745)

Anyway, I will try stopping the simulation before removeMote() and addMote().
Thank you again, and hope you can share the patch of Real-Sim if it is not hard to find.

PS.
The Simulation.stopSimulation(...) and Simulation.startSimulation(...) functions don't help.

        /**
         * Rebirth of the node
         */
        } else if (wasDepleted) {  // Currently, it is not depleted. But it was.            
            String msg = "node " + nodeLabel + " was refilled!\n";
            senseh.showMessage(msg + " @" + simulation.getSimulationTime());            
            logger.debug(msg);
            
            wasDepleted = false;            

            simulation.stopSimulation(true);
            simulation.addMote(mote);
            simulation.startSimulation();