help with events on stop playmode - send OSC message on stop

Hi

My session has some interaction with an external service via OSC.

I have it working well:

• initiating the OSC client on Awake()

• using Start() and Update() in scripts on Game Objects to send OSC events

but I'm struggling to find a solution to send a final OSC message when the game stops - user clicks playmode to stop - using OnApplicationQuit()

The OSC client appears to get destroyed before I can send the OSC messages, however that is intermittent - some times the code runs before the client is destroyed.

So I know I need to send these OSC messages slightly earlier but I can't see where - I've read the manual for Execution Order http://docs.unity3d.com/Manual/ExecutionOrder.html and couldn't work anything out for myself.

I'm not sure how I can better handle this end of lifecycle event. If Anyone has any suggestions I'd be grateful for any hints.

Here's my code:

 public class initOSC : MonoBehaviour {
     
     // when the world is awake, get the OSC ready
     void Awake()
     {
         OSCHandler.Instance.Init();
     }
 
     // called when the game is stopping   --- OnApplicationQuit
     void OnApplicationQuit()
     {
         Debug.Log("stopping");
 
         // get external sources 'parent' object
         var externalSrcs = GameObject.Find("External Sources");
 
         // for each child sound source, 
         foreach (Transform child in externalSrcs.transform)
         {
             var client = "target",
                    address= "/" + child.name + "_player" + "/" + ""
                    data = 0; //stop
             OSCHandler.Instance.SendMessageToClient(client, address, data);
         }
     }
 }