BLE failure to connect; pairDevice returns object but see no exception or onConnectedStateChange

I am scanning for a peripheral with a custom profile; this is found. But I am failing to connect with the device.

My function for connecting is.....

   function scanListener( ScanResult ){
    	Ble.setScanState( Ble.SCAN_STATE_OFF );
    	System.println( "AvailableConnectionCount is "+ Ble.getAvailableConnectionCount() );
    	try{
    		myDevice = Ble.pairDevice( ScanResult );
    		System.println( "paired device " + myDevice );
    		if( myDevice instanceof Ble.Device ){
    			System.println( "paired IS A DEVICE " + myDevice.getName() );
    			System.println( "AvailableConnectionCount is "+ Ble.getAvailableConnectionCount() );
    		}
    		if( myDevice.isConnected() ){
    			System.println( "reports Connected" );
    		}
    	}catch( exception ){
    		System.println( exception.getErrorMessage() );
    	}
    	
    }

My console output being....

initialising view
got scan result NOVA_31
AvailableConnectionCount is 3
paired device Obj: 164
paired IS A DEVICE null
AvailableConnectionCount is 3
profile registered 3F4E1400-D5C9-46C3-A2A5-090606023D85

I see no exception thrown; I see no calls of onConnectedStateChange(); the pairDevice() returns an object which is apparently a Ble.Device yet myDevice.Getname() returns null and myDevice.isConnected() returns false.



In my peripheral which is nordic based I see some debug output which kind of hints that a connection is made; but then dropped.

<info> app: systemProcessEvent SYSTEM_BLE_CONNECTED_EVT
<debug> nrf_ble_gatt: ATT MTU updated to 23 bytes on connection 0x0 (response).
<info> app: Data len is set to 0x14(20)
<debug> app: ATT MTU exchange completed. central 0xF7 peripheral 0xF7
<info> app: BLE event received. Event type = 58

<info> app: BLE event received. Event type = 18

<debug> app: Battery ADC event number: 12
<debug> app: Battery voltage: 4002
<debug> app: Battery percentage: 77%
<debug> app: Battery ADC event number: 13
<debug> app: Battery voltage: 4002
<debug> app: Battery percentage: 77%
<debug> app: Battery ADC event number: 14
<debug> app: Battery voltage: 4006
<debug> app: Battery percentage: 78%
<info> app: systemProcessEvent SYSTEM_BATTERY_DRAINING_EVT
<info> app: BLE event received. Event type = 18

<info> app: BLE_ADV_EVT_FAST event
<info> app: BLE event received. Event type = 17

<info> app: Disconnected

Going to have to get another Nordic dev kit to use as a BLE sniffer?
Is there anything else I can do?

This is my first attempt at programming using Monkey C; so I may be making some more basic mistakes. I tried to register a listener on the class that did the scan.
This passes the first ScanResult via the listener back to another class that does the connect.

class NovaApp extends Application.AppBase {

	var nble = new NovaBle();
	var myDevice = null;

    function initialize() {
        AppBase.initialize();
        
        Ble.setDelegate( nble );
        
        nble.registerProfiles();
        nble.registerScanResultListener( self );
        
        Ble.setScanState( Ble.SCAN_STATE_SCANNING );
        
    }
    
    function scanListener( ScanResult ){
    	Ble.setScanState( Ble.SCAN_STATE_OFF );
    	System.println( "AvailableConnectionCount is "+ Ble.getAvailableConnectionCount() );
    	try{
    		myDevice = Ble.pairDevice( ScanResult );
    		System.println( "paired device " + myDevice );
    		if( myDevice instanceof Ble.Device ){
    			System.println( "paired IS A DEVICE " + myDevice.getName() );
    			System.println( "AvailableConnectionCount is "+ Ble.getAvailableConnectionCount() );
    		}
    		if( myDevice.isConnected() ){
    			System.println( "reports Connected" );
    		}
    	}catch( exception ){
    		System.println( exception.getErrorMessage() );
    	}
    	
    }

class NovaBle extends Ble.BleDelegate {
  
    var listener = null;
  
    function initialize() {
        BleDelegate.initialize();
    }
    
    function registerScanResultListener( novaApp ){
    	listener = novaApp;
    }
    
    
    
    function onProfileRegister( uuid, status ) {
    	System.println( "profile registered " + uuid.toString() );
    }
    
    function onScanResults( scanResults ){
    	var item = scanResults.next();
    	while( item ){
    		if( item instanceof Ble.ScanResult ){
    			System.println( "got scan result " + item.getDeviceName() );
    			listener.scanListener( item );
    			break;
    		}
    		item = scanResults.next();
    	}
    }
    
    function onConnectedStateChange( device, state ){
    	System.println( device.getName() + " state " + state );
    }
    

Have hit a wall. So hopefully one of you has some ideas.

Regards,
Owain