private static void OnConnected(object param, MqttClientConnectedEventArgs args)
{
Console.WriteLine("### CLIENT CONNECTING ###");
SystemEvent systemEvent = new SystemEvent(SystemEventTypesEnum.DeviceOnline, null, null, args.ClientId);
var jsonMessage = JsonConvert.SerializeObject(systemEvent, new JsonSerializerSettings {
NullValueHandling = NullValueHandling.Ignore
});
producer.ProduceMessage(Literals.KAFKA_TOPIC_DEVICESTATUS, jsonMessage);
Console.WriteLine("### CLIENT CONNECTED ###");
}