After building a GEM Host in TransSECS you can register to receive the current status of the connection:

    host.addConnectionStatusListener(new ConnectionStatusListener() {
 
      @Override
      public void connectionStatusChanged(int connectionStatus, String comment) {
         System.out.println ("Current Connection Status " + connectionStatus + " Status String \"" + comment + "\"");        
      }
    });

For this code snippet to work correctly, host must not be null. This can happen if this code is run in an initialization process, such as in a StartupTrigger script, because the StartupTrigger code could be (and probably will be) run before the normal TransSECS/MIStudio startup sequence which starts the host controller. See the Thread code example below Threaded Example to solve this issue.

This code example is run from a StartupTrigger script in TransSECS (or a script triggered by the StartupTrigger in MIStudio) to set up the ConnetionStatusListener. For MIStudio, this script pushes data to two BroadcastServers (StatusListenerCommand and StatusListenerValue) whenever there is a connection status change.

 //sets up a listener to handle connection status changes
 var TransSecsController = Java.type("com.ergotech.transsecs.secs.TransSecsController");
 var ConnectionStatusListener = Java.type("com.ergotech.transsecs.secs.host.ConnectionStatusListener");
 
 
 var statusListener  = new ConnectionStatusListener() {
    connectionStatusChanged : function(connectionStatus,comment) {
      print ("Current Connection Status " + connectionStatus + " Status String \"" + comment + "\"");    
      StatusListenerComment->setStringValue(comment);
      StatusListenerValue->setIntValue(connectionStatus);    
     }
  }
 
 host=TransSecsController.findController("GEMHost");     //use  your GEM Host name 
 host.addConnectionStatusListener(statusListener);

In the code below, which is run from a StartupTrigger script in TransSECS (or a script triggered by the StartupTrigger in MIStudio), a Thread is started which waits for the host not to be null and then sets up the ConnectionStatusListener.

 //sets up a listener to handle connection status changes
 var TransSecsController = Java.type("com.ergotech.transsecs.secs.TransSecsController");
 var ConnectionStatusListener = Java.type("com.ergotech.transsecs.secs.host.ConnectionStatusListener");
 var Thread = Java.type("java.lang.Thread");
 
function waitForHost() {  
    print("wait for host THREAD started"); 
    host=TransSecsController.findController("GEMHost"); //use your host name here
    while (host==null) { 
        //print("host is still null");  
        Thread.sleep(50); //wait 50 ms
        host=TransSecsController.findController("GEMHost");
    } 
    host=TransSecsController.findController("GEMHost");
   // print("host is not null, setting up connection status listener");  
    var connectionStatusListener = new ConnectionStatusListener() {
 
    connectionStatusChanged : function (connectionStatus, comment) {
       updateToolStatus(connectionStatus,comment);
       //below is for MIStudio projects, two BroadcastServers are written to with the connection status values
      StatusListenerComment->setStringValue(comment);
      StatusListenerValue->setIntValue(connectionStatus);    
       print ("Current Connection Status " + connectionStatus + " Status String \"" + comment + "\"");        
     }
  };
   // add this listener to the host  
   host.addConnectionStatusListener(connectionStatusListener);
   print("Connection Status Trigger Registered");
 }//end of function to wait for host
 
/// START OF MAIN JAVASCRIPT CODE ///
print("Startup Trigger");
 
 var r = new java.lang.Runnable() {
     run: function() { waitForHost(); }
 }
 
 new Thread(r).start();