MvvmCross ILocationWatcher Success Action not firing - Android - geolocation

Question

I'm trying to integrate the MvxGeolocation plugin for android and I'm having issues getting the watcher to fire the success event. It just does not fire.
I've followed the documentation from MvvmCross (https://github.com/MvvmCross/MvvmCross/wiki/MvvmCross-plugins#location).
As per the documentation I've created a separate Service that publishes messages to the ViewModel, rather than have the IMvxLocationWatcher hooked directly up to the ViewModel.
public class GeoLocationService: IGeoLocationService
{
private readonly IMvxLocationWatcher _watcher;
private readonly IMvxMessenger _messenger;
public GeoLocationService(IMvxLocationWatcher watcher, IMvxMessenger messenger)
{
_watcher = watcher;
_messenger = messenger;
_watcher.Start(new MvxLocationOptions(), OnLocation, OnError);
}
public void OnLocation(MvxGeoLocation location)
{
var message = new LocationMessage(this, location.Coordinates.Latitude, location.Coordinates.Longitude);
_messenger.Publish(message);
}
public void OnError(MvxLocationError error)
{
Mvx.Error("Seen location error {0}", error.Code);
}
}
The OnLocation(MvxGeoLocation location) method is meant to publish a message that my ViewModel subscribes too as you can see below:-
public class MainViewModel : MvxViewModel
{
private readonly MvxSubscriptionToken _token;
public MainViewModel(IMvxMessenger messenger)
{
_token = messenger.SubscribeOnMainThread<LocationMessage>(OnLocationMessage);
}
private void OnLocationMessage(LocationMessage locationMessage)
{
Lat = locationMessage.Lat;
Lng = locationMessage.Lng;
}
double _latitude;
public double Lat
{
get
{
return _latitude;
}
set
{
_latitude = value;
RaisePropertyChanged(() => Lat);
}
}
double _longitude;
public double Lng
{
get
{
return _longitude;
}
set
{
_longitude = value;
RaisePropertyChanged(() => Lng);
}
}
string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
RaisePropertyChanged(() => Name);
}
}
}
I've added Bootstrapper classes to the android application that resolve both the Messenger and LocationWatcher plugins. Ive also registered the GeoLocationService in the App class in my core library like this :-
public class App : MvxApplication
{
public App()
{
Mvx.ConstructAndRegisterSingleton<IGeoLocationService, GeoLocationService>();
Mvx.RegisterSingleton<IMvxAppStart>(new MvxAppStart<MainViewModel>());
}
}
I've also edited the AndroidManifest.Xml and added the following user permissions :-
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
Im debugging this against a plugged in Device (Samsung S6 Edge).
Ive tested my view.xaml to ensure that binding is working by passing it some default values.. and everything is as expected.
The issue is that The Action in the Watcher class for Success or Error are never called.