public async Task<IEnumerable<Light>> GetLightsAsync()
{
var lights = new List<Light>();
HttpResponseMessage response = await HttpGetAsync("lights");
string json = await response.Content.ReadAsStringAsync();
JObject jObject = JObject.Parse(json);
foreach (JProperty property in jObject.Properties())
{
Light light = JsonConvert.DeserializeObject<Light>(property.Value.ToString());
light.Id = property.Name;
light._bridge = this;
light.State._light = light;
if (light.State.Reachable)
{
lights.Add(light);
}
}
return lights;
}
/// <summary>
/// The entry point of a background task.
/// </summary>
public async void Run(IBackgroundTaskInstance taskInstance)
{
backgroundTaskInstance = taskInstance;
var details = taskInstance.TriggerDetails as BluetoothLEAdvertisementWatcherTriggerDetails;
if (details != null)
{
_deferral = backgroundTaskInstance.GetDeferral();
taskInstance.Canceled += (s, e) => _deferral.Complete();
var localStorage = ApplicationData.Current.LocalSettings.Values;
_bridge = new Bridge(localStorage["bridgeIp"].ToString(), localStorage["userId"].ToString());
try
{
_lights = await _bridge.GetLightsAsync();
}
catch (Exception)
{
_deferral.Complete();
return;
}
foreach(var item in details.Advertisements)
{
Debug.WriteLine(item.RawSignalStrengthInDBm);
}
// -127 is a BTLE magic number that indicates out of range. If we hit this,
// turn off the lights. Send the command regardless if they are on/off
// just to be safe, since it will only be sent once.
if (details.Advertisements.Any(x => x.RawSignalStrengthInDBm == -127))
{
foreach (Light light in _lights)
{
light.State.On = false;
await Task.Delay(250);
}
}
// If there is no magic number, we are in range. Toggle any lights reporting
// as off to on. Do not spam the command to lights arleady on.
else
{
foreach (Light light in _lights.Where(x => !x.State.On))
{
light.State.On = true;
await Task.Delay(250);
}
}
// Wait 1 second before exiting to ensure all HTTP requests have sent.
await Task.Delay(1000);
_deferral.Complete();
}
}
