I got a STM32 development board, the core plate is BC20, with NB module, I will own package development board: "the MQTT protocol to transmit data of temperature and humidity to ali cloud iot platform" burn into development board, realize the real-time display of temperature and humidity in the air, and then use a machine MQTT Client, want to show that temperature and humidity data, the current PC only display the prefix "temperature", behind the prefix value no specific temperature and humidity, but also real-time refresh, now think the problem may be in (1) : development board on the payload data sent to the cloud of the original is missing a part (2) ali cloud forwarding rules engine SQL statements written wrong (3) the QT side analytical data should be correct, seek advice, I appreciate!