MQTT is an application layer protocol. After the client and server establish a network connection (usually TCP/IP), the client sends a CONNECT message to the server to request the establishment of an MQTT connection, and the server replies with a CONNACK message to accept or reject the connection. The connection process is as follows: __CONNECT … Read more
In the previous issue, we introduced the publish and subscribe framework of MQTT: MQTT Publish and Subscribe Architecture The two most important roles are MQTT clients and MQTT brokers (intermediaries). Let’s quickly review these two core components: The publish/subscribe model decouples the client responsible for sending messages (the publisher) from the client responsible for receiving … Read more
Yuan Zheng has added two practical features during the diagnostic process: displaying the car voltage and allowing continued diagnostics after Bluetooth reconnection during the diagnostic process. Voltage Display in the Upper Right Corner of the Diagnostic Process During vehicle repairs, technicians often need to connect an external power source to charge the car, to prevent … Read more