Additionally, there is also client support for MQTT-SN (Sensor Network) This implementation provides support for MQTT v5.0 and is based on MQTT v3.1.1. It supports all Packet Types, all Quality of Service (QoS) levels 0-2 and supports SSL/TLS using the wolfSSL library. wolfMQTT was built from the ground up to be multi-platform, space conscience and extensible. From this, it can provide the security that the MQTT protocol lacks. It supports SSL/TLS via the wolfSSL library. The wolfMQTT library is a client implementation of the MQTT written in C for embedded use. Constrained devices can benefit from using TLS session resumption to reduce the reconnection cost.
The MQTT specification recommends TLS as a transport option to secure the protocol using port 8883 (secure-mqtt), as the MQTT protocol does not provide security on its own. The protocol efficiently packs messages to minimize overhead. MQTT is based on the Pub/Sub messaging principle of publishing messages and subscribing to topics. MQTT (Message Queuing Telemetry Transport) is a lightweight open messaging protocol that was developed for constrained environments such as M2M (Machine to Machine) and IoT (Internet of Things), where a small code footprint is required.
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