A system includes a messaging system server to interface with Internet of Thing (IoT) devices operating with different messaging protocols. The IoT devices include a first IoT device operating with a first messaging protocol and a second IoT device operating with a second messaging protocol that is different from the first messaging protocol. The second IoT device is subscribed to receive messages from the first IoT device. The messaging system server includes a Quality of Service (QoS) database providing at least one guaranteed message delivery option for a message being delivered from the first IoT device to the second IoT device. A device cooperates with the messaging system server to generate commands for controlling the first and second IoT devices, and to associate the at least one guaranteed message delivery option in the QoS database to the message being delivered from the first IoT device to the second IoT device.