/// <summary>
/// Constructor.
/// </summary>
public MqttSubscriber(
OnEnablementUpdatedCallback onEnablementUpdatedCallback,
OnLightLevelUpdated onLightLevelUpdatedCallback,
OnFluxStatusUpdatedCallback onFluxStatusUpdatedCallback)
{
if (null == onEnablementUpdatedCallback)
{
throw new ArgumentNullException(nameof(onEnablementUpdatedCallback));
}
if (null == onLightLevelUpdatedCallback)
{
throw new ArgumentNullException(nameof(onLightLevelUpdatedCallback));
}
MqttFactory = new MqttFactory();
MqttClient = MqttFactory.CreateMqttClient();
// Handle callbacks
MqttClient.UseApplicationMessageReceivedHandler(e =>
{
try
{
string utfString = Encoding.UTF8.GetString(e.ApplicationMessage.Payload, 0, e.ApplicationMessage.Payload.Length);
if (e.ApplicationMessage.Topic.Equals($"{MqttConfig.Topic}/set", StringComparison.OrdinalIgnoreCase))
{
bool enable = Convert.ToBoolean(utfString);
onEnablementUpdatedCallback(enable);
}
else if (e.ApplicationMessage.Topic.Equals($"{MqttConfig.Topic}/lightlevel", StringComparison.OrdinalIgnoreCase))
{
double lightLevel = Convert.ToDouble(utfString);
onLightLevelUpdatedCallback(lightLevel);
}
else if (e.ApplicationMessage.Topic.Equals($"{MqttConfig.Topic}/status", StringComparison.OrdinalIgnoreCase))
{
FluxStatus fluxStatus = JsonConvert.DeserializeObject <FluxStatus>(utfString);
onFluxStatusUpdatedCallback(fluxStatus.Brightness, fluxStatus.ColorTemperature);
}
}
catch (Exception)
{
}
});
// Handle subscription connection
MqttClient.UseConnectedHandler(async e =>
{
Log.Debug($"{nameof(MqttSubscriber)} is connected. Attempting to subscribe to topic '{MqttConfig.Topic}'.");
// Subscribe to the desired topic when connected
MqttClientSubscribeResult result = await MqttClient.SubscribeAsync(new TopicFilterBuilder()
.WithTopic($"{MqttConfig.Topic}/#")
.Build());
});
// Handle disconnects
MqttClient.UseDisconnectedHandler(async e =>
{
Log.Debug($"{nameof(MqttSubscriber)} is disconnected. Attempting to reconnect.");
// Allow time for network connectivy hiccups to be resolved before trying again.
await Task.Delay(TimeSpan.FromSeconds(1));
// Reconnect when disconnected
Connect();
});
}
/// <summary>
/// Publishes a FluxStatus payload.
/// </summary>
/// <param name="topic">Topic</param>
/// <param name="payload">Payload</param>
/// <param name="retain">Retain</param>
/// <returns></returns>
public async Task PublishFluxStatus(FluxStatus fluxStatus)
{
await Publish("status", JsonConvert.SerializeObject(fluxStatus), true);
}
