private IDisposable BindObserver(
IMqttMessageBus target,
TEntity entity,
TEntityDefinition entityDefinition,
MqttQualityOfServiceLevel?qualityOfServiceLevel,
bool retainMessages)
=> GetStateChangeDetector(entity)
.Subscribe(
state =>
{
var payload = GetStateMessagePayload(entityDefinition, entity);
var messageBuilder = new MqttApplicationMessageBuilder()
.WithTopic(entityDefinition.StateTopic)
.WithPayload(payload)
.WithRetainFlag(retainMessages);
if (qualityOfServiceLevel.HasValue)
{
messageBuilder = messageBuilder.WithQualityOfServiceLevel(qualityOfServiceLevel.Value);
}
var message = messageBuilder.Build();
if (message.Payload != null)
{
target.PublishMessage(message);
}
}
);
public virtual void Bind(IMqttMessageBus messageBus, bool sendDiscovery = true)
{
if (MessageBus != null)
{
throw new InvalidOperationException($"{nameof(Bind)} can only be called once");
}
MessageBus = messageBus ?? throw new ArgumentNullException(nameof(messageBus));
if (sendDiscovery)
{
MessageBus.PublishMessage(EntityConfiguration.DiscoveryMessage);
}
}