ESP_mqtt

Supports all MQTT features including three QoS levels, authentication, will messages, and keep-alive pings, making it a fully functional client for robust IoT applications.

Allows simultaneous connections to multiple MQTT brokers, a feature not commonly found in ESP8266 libraries, enabling complex IoT architectures.

Built-in support for secure encrypted connections, essential for production-grade IoT devices that need safe internet communication.

Easy configuration of LWT messages to handle client disconnections gracefully, improving reliability in network failures as shown in the code examples.