fix 车辆报文推送到kafka

src/main/java/com/muyu/mqtt/MessageCallbackService.java

@@ -36,9 +36,9 @@ public class MessageCallbackService implements MqttCallback {
         String s = new String(mqttMessage.getPayload());
         MessageData main = ConversionUtil.main(s);
         String vin = main.getVin();
-        ProducerRecord<String, String> stringObjectProducerRecord = new ProducerRecord<>(vin,main.toString());
-        kafkaTemplate.send(stringObjectProducerRecord);
 
+        ProducerRecord<String, Object> stringObjectProducerRecord = new ProducerRecord<>("test",main);
+        kafkaTemplate.send(stringObjectProducerRecord);
 
     }