diff --git a/ebike-gather/src/main/java/org/cdzy/gather/mqtt/MqttHandler.java b/ebike-gather/src/main/java/org/cdzy/gather/mqtt/MqttHandler.java
index 368e0ab..8f3fbf7 100644
--- a/ebike-gather/src/main/java/org/cdzy/gather/mqtt/MqttHandler.java
+++ b/ebike-gather/src/main/java/org/cdzy/gather/mqtt/MqttHandler.java
@@ -94,7 +94,7 @@ public class MqttHandler extends ChannelInboundHandlerAdapter {
             processReceivedMessage(topic, content);
         } catch (Exception e) {
             log.error("处理MQTT消息异常，主题: {}", topic, e);
-        }finally {
+        } finally {
             payload.release();
         }
     }
@@ -134,6 +134,19 @@ public class MqttHandler extends ChannelInboundHandlerAdapter {
             } else if (topic.startsWith("control/")) {
                 handleControlCommand(topic, content);
             }
+            if (topic.startsWith("$SYS/brokers/")) {
+                boolean isOnline = isConnectedEvent(topic);
+                String clientId = objectMapper.readValue(content, ObjectNode.class).get("clientid").asText();
+                if (isOnline) {
+                    log.info("设备上线: {}", clientId);
+                } else {
+                    log.info("设备下线: {}", clientId);
+                }
+                ObjectNode jsonNode = objectMapper.createObjectNode();
+                jsonNode.put("deviceId", clientId);
+                jsonNode.put("isOnline", isOnline);
+                kafkaProducer.send("device_online", objectMapper.writeValueAsString(jsonNode));
+            }
         } catch (Exception e) {
             log.error("处理MQTT消息业务逻辑异常", e);
         }
@@ -196,4 +209,23 @@ public class MqttHandler extends ChannelInboundHandlerAdapter {
             throw new RuntimeException("Failed to process JSON", e);
         }
     }
+
+    /**
+     * 判断MQTT主题是否为上线事件
+     *
+     * @param topic 主题字符串
+     * @return true: 上线事件, false: 下线事件（若主题无法识别则返回false）
+     */
+    private boolean isConnectedEvent(String topic) {
+        if (topic == null) return false;
+        if (topic.endsWith("/connected")) {
+            return true;
+        } else if (topic.endsWith("/disconnected")) {
+            return false;
+        } else {
+            // 既不是connected也不是disconnected，可根据需要处理（例如抛异常或记录警告）
+            log.warn("未知的上下线主题格式: {}", topic);
+            return false; // 默认返回false（下线）或根据业务决定
+        }
+    }
 }
\ No newline at end of file
diff --git a/ebike-gather/src/main/resources/application-prod.yml b/ebike-gather/src/main/resources/application-prod.yml
index fb5774b..97dff05 100644
--- a/ebike-gather/src/main/resources/application-prod.yml
+++ b/ebike-gather/src/main/resources/application-prod.yml
@@ -29,7 +29,7 @@ mqtt:
   port: 1883
   username: admin
   password: admin970529
-  auto-subscribe-topics: ecu/rpt/#,ecu/rsp/#
+  auto-subscribe-topics: ecu/rpt/#,ecu/rsp/#,$SYS/brokers/+/clients/+/connected,$SYS/brokers/+/clients/+/disconnected
   timeout: 10               # 减少超时时间以便更快失败
   clean-session: true
   keep-alive: 60