`fix `

ruoyi-system/src/main/java/com/ruoyi/data/service/impl/MqttServiceImpl.java

@@ -82,7 +82,7 @@ public class MqttServiceImpl implements MqttService {
         if(saveAndForward) {
 
             JSONObject jsonObject = new JSONObject(mqttStr);
-            Long sensorId = Long.valueOf((String) jsonObject.get("sensorId"));
+            Long sensorId = jsonObject.getLong("sensorId");
             TblSensor tblSensor = tblSensorMapper.selectById(sensorId);
             Long deviceId = tblSensor.getDeviceId();
             SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");