SendMessage

//our Service.js code.
//In regular usage move this code to a separate Service.js file
var servicejs = `
//Init variables.
var count = 0;
var diff = 1;

//Called when service is started.
function OnStart()
{
    app.ShowPopup( "Hello from Service!" );

    //Start a timer to do some regular work.
    setInterval( DoWork, 500 );
}

//Called when we get a message from main app.
function OnMessage( msg )
{
    app.Debug( msg );

    //Handle commands from main App.
    if( msg == "change" ) diff = (diff > 0 ? -1 : 1);
}

//This is where we do some regular background task
//(here we just modify a counter and send it back to the app, if its running).
function DoWork()
{
    count += diff;
    app.SendMessage( count );
}`

function OnStart()
{
    //Create the Service.js file
    //(In regular usage create the file yourself)
    app.WriteFile("Service.js", servicejs );

    //Create a layout.
    lay = app.CreateLayout( "linear", "VCenter,FillXY" );

    //Create text control to display data from the service.
    txt = app.CreateText( "", 0.4 );
    txt.SetTextSize( 22 );
    lay.AddChild( txt );

    //Create an 'Send Message' button.
    btn = app.CreateButton( "Send Message to Service", 0.6, 0.1 );
    lay.AddChild( btn );
    btn.SetOnTouch( function(){ svc.SendMessage("change"); } );

    //Create a 'Stop Service' button.
    btn = app.CreateButton( "Stop Service", 0.6, 0.1 );
    lay.AddChild( btn );
    btn.SetOnTouch( function(){ svc.Stop(); } );

    //Add layout to app.
    app.AddLayout( lay );

    //Start/connect to our service.
    svc = app.CreateService( "this", "this", OnServiceReady );
    svc.SetOnMessage( OnServiceMessage );

    //This will cause your service to start at boot.
    //(Set it to "none" if you need to stop it starting)
    //app.SetAutoBoot( "Service" );
}

//Called after our service has started.
function OnServiceReady()
{
    app.Debug( "Service Ready" );
}

//Called when messages comes from our service.
function OnServiceMessage( msg )
{
    txt.SetText( "Count: " + msg );
}

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