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MQTT – LWAT, Last Will and Testament

MQTT protocol often used in network, where bandwith or signal is limited between the clients and the broker. These limitations can cause unexpected disconnections of clients from the network and the broker. It can cause trouble if we rely on the messages in our application and can not tell if the client is disconnected. There …

MQTT QoS, Quality of Service

In MQTT protocol, with QoS (Quality of Service) we define an agreement between the client and the broker about the message delivery level. This level is defined at two point. When the client is Subscribed to a topic (path) and when the client is publish a message.There are 3 levels of QoS: level 0: The …