web端使用mqtt报错Connection lost: AMQJS0005E Internal error. Error Message: AMQJS0009E Malformed UTF data

现象：连接一次后数据显示然后连接丢失
Connection lost: AMQJS0005E Internal error. Error Message: AMQJS0009E Malformed UTF data

正确 ： console.log("Received message: " + message***.payloadBytes.*t**oString());
错误： console.log("Received message: " + message.payloadString);