[AI Generated]: refactor(*): 保活定时器与连接清理逻辑收口至 app.js，修复 null 安全与注释错误

- 新增 app.startKeepAlive/stopKeepAlive/cleanupConnection，bus 监听自动控制保活与断联清理
- Blue.stop() 收入 cleanupConnection，页面 onHide/onUnload 统一调用
- 修复 replaceNetwork.js seviceList 可能为 undefined 导致崩溃
- 修复 configureDevice_2.js device.mac 为 null 时崩溃
- 修复 replaceNetwork_1.js activeProtocol 无 null 检查及 wifiList 容错
- 修正 configureDevice_4.js 超时注释（3分钟→30秒）

pages/configureDevice/configureDevice.js

@@ -49,7 +49,6 @@ Page({
 						ppScale.device.name = this.data.device.name;
 						ppScale.device.connection = this.data.device;
 						wx.hideLoading();
-						this._startKeepAlive();
 						if (currentStep === 2) {
 							const comp = this.selectComponent('#configureDevice3');
 							if (comp) comp.reInitWifi();
@@ -64,7 +63,6 @@ Page({
 					ppScale.activeProtocol.codeSyncTime((codeSyncTime) => {
 						console.log("===》codeSyncTime", codeSyncTime);
 						wx.hideLoading();
-						this._startKeepAlive();
 						ppScale.device.name = this.data.device.name;
 						ppScale.device.connection = this.data.device;
 						const nameArr = this.data.device.name.split("-");
@@ -148,8 +146,7 @@ Page({
 	},
 
 	setConfigSuccessful() {
-		this._stopKeepAlive();
-		ppScale.plugin.Blue.stop();
+		app.cleanupConnection();
 		wx.switchTab({
 			url: "/pages/home/home"
 		})
@@ -186,25 +183,6 @@ Page({
 		}
 	},
 
-	// 启动保活定时器，每10秒发送一次保活指令
-	_keepAliveTimer: null,
-	_startKeepAlive() {
-		this._stopKeepAlive();
-		this._keepAliveTimer = setInterval(() => {
-			if (ppScale.activeProtocol) {
-				ppScale.activeProtocol.sendKeepAliveCode();
-			}
-		}, 15000);
-	},
-
-	// 清除保活定时器
-	_stopKeepAlive() {
-		if (this._keepAliveTimer) {
-			clearInterval(this._keepAliveTimer);
-			this._keepAliveTimer = null;
-		}
-	},
-
 	checkBluetoothPermissionAndInit() {
 		wx.getSetting({
 			success: (res) => {
@@ -263,7 +241,7 @@ Page({
 
 	onHide() {
 		console.log("configureDevice onHide");
-		this._stopKeepAlive();
+		app.cleanupConnection();
 		// 配网步骤：立即清空 WiFi 列表（stop 后数据已失效）
 		if (this.data.progress.index === 2) {
 			const comp = this.selectComponent('#configureDevice3');
@@ -271,22 +249,16 @@ Page({
 				comp.setData({ progress: 0, wifiList: [], selectWifi: null, selectWifiPWD: "" });
 			}
 		}
-		app.resetReconnectCount();
-		app.setGlobalData('ppScale.device.connectState', null);
 		this._connectReady = false;
 		this._macReady = false;
 		this._stopTime = Date.now();
-		ppScale.plugin.Blue.stop();
 	},
 
 	onUnload() {
 		console.log("configureDevice onUnload");
-		this._stopKeepAlive();
-		app.resetReconnectCount();
-		app.setGlobalData('ppScale.device.connectState', null);
+		app.cleanupConnection();
 		this._connectReady = false;
 		this._macReady = false;
 		this._stopTime = Date.now();
-		ppScale.plugin.Blue.stop();
 	}
 })

pages/replaceNetwork/replaceNetwork.js

@@ -59,7 +59,6 @@ Page({
                     const nameArr = this.data.device.name.split("-");
                     app.globalData.ppScale.version = nameArr.length === 5 ? "domain2" : "domain1";
                     wx.hideLoading();
-                    this._startKeepAlive();
                     if (this.data.progress === 0) {
                         const comp = this.selectComponent('#replaceNetwork1Component');
                         if (comp) comp.getWiFiList();
@@ -193,6 +192,11 @@ Page({
             let seviceList = app.globalData.ppScale.device.setting.find((item) => {
                 return item.deviceName === res.result[0].type
             });
+            if (!seviceList) {
+                wx.hideLoading();
+                wx.showToast({ title: '未找到匹配的设备类型', icon: 'none' });
+                return;
+            }
             app.globalData.ppScale.plugin.Blue.setDeviceSetting([seviceList]);
             app.globalData.ppScale.plugin.Blue.start(res.result[0].type, false);
             app.globalData.ppScale.plugin.bus.subscribe("devicesList", (res_) => {
@@ -262,39 +266,14 @@ Page({
         }
     },
 
-    // 启动保活定时器，每10秒发送一次保活指令
-    _keepAliveTimer: null,
-    _startKeepAlive() {
-        this._stopKeepAlive();
-        this._keepAliveTimer = setInterval(() => {
-            if (app.globalData.ppScale.activeProtocol) {
-                app.globalData.ppScale.activeProtocol.sendKeepAliveCode();
-            }
-        }, 15000);
-    },
-
-    // 清除保活定时器
-    _stopKeepAlive() {
-        if (this._keepAliveTimer) {
-            clearInterval(this._keepAliveTimer);
-            this._keepAliveTimer = null;
-        }
-    },
-
     onHide() {
         console.log("replaceNetwork onHide");
-        this._stopKeepAlive();
-        app.resetReconnectCount();
-        app.setGlobalData('ppScale.device.connectState', null);
-        app.globalData.ppScale.plugin.Blue.stop();
+        app.cleanupConnection();
     },
 
     onUnload() {
         console.log("replaceNetwork onUnload");
-        this._stopKeepAlive();
-        app.resetReconnectCount();
-        app.setGlobalData('ppScale.device.connectState', null);
-        app.globalData.ppScale.plugin.Blue.stop();
+        app.cleanupConnection();
         if (this._connectStateWatcher) {
             app.unwatch('ppScale.device.connectState', this._connectStateWatcher);
         }