Background : Crossing the firewall.

With a background you have the every 5 minute max.

But since background code is available to the main app, I actually call the comm part from the main app.  I have a class called "MyComm" for example.

(:backround)

Class MyComm {

function makeRequest(...) {

}

function handleResponse(...)  {

}

}

You can use it in both the background and foreground.  I do this on widgets for devices that don't even allow backgrounding.

That's pretty much what I was trying, but I am clearly doing something wrong and / or different.

You aren't extending ServiceDelegate for MyComm, is that correct? EG: Are you calling "MyComm" from the ServiceDelegate?

Specifically, the problems I'm seeing right now are like this:

// IN APP BASE INITIALISE, DECLARE A SERVICE DELEGATE
(:background)
class WF_ServicesApp extends Application.AppBase {
    var svcDel;
    function initialize() {
        AppBase.initialize();
        svcDel = new ServiceManagerDelegate();
        
// RETURNING SAME IN getServiceDelegate()
    function getServiceDelegate() {
    	return [svcDel];
    }
    
// INSIDE SERVICE DELEGATE
var nextUrl;
	var nextPayload;
	var nextOptionsPost;
	var nextRequestIdentifier;
	function getJSON(identifier,url,payload,isPost) {
		nextRequestIdentifier = identifier;
		nextUrl = url;
		nextPayload = payload;
		nextOptionsPost = isPost;
		Toybox.System.println("REGISTERED POST "+nextRequestIdentifier+" WITH\n"+nextUrl+"\n"+nextPayload+"\n"+(nextOptionsPost?"post":"get"));
		startTemporal();
	}
	function onTemporalEvent() { //A callback method that is triggered in the background when time-based events occur.
		var options =  {
		   :method => nextOptionsPost ? Communications.HTTP_REQUEST_METHOD_POST : Communications.HTTP_REQUEST_METHOD_GET,
		   :responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON
		};
		Toybox.System.println("REQUST IS \n"+nextUrl+"\n"+nextPayload+"\n"+options+"\n"+method(:responseCallback));
		Communications.makeWebRequest(nextUrl, nextPayload, options, method(:responseCallback));
	}

From console logs, I then see:

REGISTERED POST kpay WITH
https://testurl.url/api/
{accounttoken=>"STUFF"}
get
Background: init
Background: onStart
Background: CALLING GET SERVICE DELEGATE 
Background: REQUST IS 
null
null
{symbol (8388786)=>1, symbol (8389844)=>0}
Obj: 148

Error: Unhandled Exception
Exception: UnexpectedTypeException: Expected String, given null
Stack: 
  - makeWebRequest() at T:\mbsimulator\submodules\technology\monkeybrains\virtual-machine\api\Communications.mb:385 0x30000e1f 
  - onTemporalEvent() at E:\gdcsoft\SVN_GARMIN\WF_Services\source\WF_ServicesApp.mc:122 0x100005d4 

EG: The values that I have passed to svcDel are clearly set (and verified in console) but are not available (null) when I actually do the Comms request.

I mean... I could be doing something daft here, but I can't see where or what.

Stripped down version of what I do:

	(:background)
class WuServiceDelegate extends Sys.ServiceDelegate {
	var Wub;	
...
	function onTemporalEvent() {    
	    Wub=new WComm();
	    //get location					    
	    if(loc!=null) {	    	
	    	Wub.doRequest(loc,method(:receiveW));
	    }
	}

	function receiveW(responseCode, data) {			
	    if(responseCode==200) {		
		Background.exit(data);			
	    } else {	
		Background.exit(responseCode);
	    }
	} 
}

(:background)
class WuComm {
	var callback;
	
	function initialize() {
	}
	
	function doRequest(loc,cb) {
	    callback=cb;
	    //do the makeWebRequest, with method(:receiveStation) as the call back;
	}

	function receiveWeather(responseCode, data) {
	    callback.invoke(responseCode,data);
	    callback=null;
	}
}

So when the background runs, I see the results by way of onBackgroundData()

But the main app can also call

Wub2.doRequest(loc,method(:receiveW2));

(Wub2 is like Wub, but done in initialize in the main app)

and see the response in receiveW2()

The problem was actually more basic than that!

I was stuck at:

// get location

But I see from some sample projects people were using app.getProperty() to pass data about. Looks a bit weird to need that, but it works.

And cannot use symbols in the response data! 0_0

I generally return the dictionary I get back from the makeWebRequest.

In the code I posted, another trick is if there is an error (non 200), I return that instead of the response for onBackgroundData() so the main app can act on the specific error.