...The MQTT protocol is widely utilised for communication in various real-world scenarios, primarily serving as a reliable communication protocol for data transfer to and from IoT devices. While the MQTT protocol itself is relatively straightforward, integrating it into an application can be complex, especially due to the challenging implementation of message retransmission after a disconnect/reconnect sequence. The aim of Async.MQTT5 is to provide a very simple asynchronous C++ interface for application developers. The internal Client's implementation manages network and MQTT protocol details.