/// <summary>
/// Subscribes to the MQTT topics in SubscribedTopics.
/// </summary>
/// <param name="cancellationToken">Cancelation token.</param>
/// <returns>Awaitable <see cref="Task" />.</returns>
protected virtual async Task SubscribeAsync(CancellationToken cancellationToken = default(CancellationToken))
{
_serviceLog.LogInformation("MQTT subscribing to the following topics: " + string.Join(", ", SubscribedTopics));
await MqttClient.SubscribeAsync(SubscribedTopics
.Select(topic => new TopicFilterBuilder()
.WithTopic(topic)
.WithAtLeastOnceQoS()
.Build()))
.ConfigureAwait(false);
}
