Short Description:

MQTT client for Unreal - connect, publish and subscribe with QoS levels, retained messages and Blueprint + C++ APIs.

Long Description:

MqttLink brings the industry-standard MQTT protocol to Unreal Engine. Publish telemetry, subscribe to topics and drive gameplay from broker messages - perfect for IoT, dashboards and companion apps.

Connect to any MQTT broker, subscribe to topic filters with + and # wildcards, publish with the QoS level each message deserves, and receive everything as game-thread Blueprint events. Retained messages, clean-session control and the topic-matching helper cover the protocol's practical corners, and demo content shows the full flow end to end.

MQTT is the lingua franca of IoT and messaging infrastructure. MqttLink turns Unreal into a live participant: digital twins reacting to factory sensors, smart-building visualizations, companion-app control channels, robotics dashboards, and cross-service game messaging through brokers like Mosquitto, EMQX or HiveMQ.

MqttLink is part of the Alpha XP networking collection for Unreal Engine 4.27-5.0+. Every feature is exposed to both Blueprints and C++, ships with styled HTML documentation, and follows one consistent API style across the whole collection. The plugin is compiled and verified against a clean UE 4.27 project, comes with a utility node pack (hashing, GUIDs, timestamps, tokens, validation), and is maintained under the Alpha XP brand with documentation hosted online.

Key Features:

- MQTT connect/publish/subscribe/unsubscribe

- QoS 0/1/2 and retained messages

- Game-thread Blueprint events

- Topic wildcard matching helper (+/#)

- Demo content included

- Utility node pack: CRC32/MD5/SHA-1 hashing, GUIDs, timestamps, random tokens and hostname validation

Full documentation: https://demo.alphaxp.net/FabStore/Network/MqttLink/

Support: https://alphaxp.net/