add

mqtt信息发送

nb-core/src/main/java/com/nb/core/config/MqttConfig.java

@@ -27,6 +27,9 @@ public class MqttConfig {
     @Bean
     @ConditionalOnBean(MqttProperties.class)
     public MqttPahoClientFactory mqttClientFactory(MqttProperties mqttProperties) {
+        if(mqttProperties==null||mqttProperties.getBroker()==null){
+            return null;
+        }
         DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
         MqttConnectOptions options = new MqttConnectOptions();
         options.setServerURIs(new String[]{mqttProperties.getBroker().getUrl()});