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can2mqtt is a bridge between a CAN-Bus and a MQTT-Broker. In CAN you have so called CAN-Frames. Each CAN-Frame can contain up to eight bytes of payload and CAN-Frame has an ID. In the MQTT you have topics and messages. Each message has a specific topic. can2mqtt maps CAN-IDs to MQTT-Topics and their respective payloads to messages. It also works the other way around, as you can see in the video.