[AI Generated]: fix(*): 修复 SDK bus 不支持 unsubscribe 导致的崩溃，改用标志位防重复订阅；修复 OTA 回调注释逻辑

app.js

@@ -151,44 +151,27 @@ App({
 		this.globalData.ppScale.plugin = requirePlugin('ppScale-plugin');
 	},
 
-	// 存储 app 级 bus 回调引用，用于精准 unsubscribe
-	_busCallbacks: {
-		connectState: null,
-		syncDeviceTimeSuccess: null,
-		deviceWillDisconnect: null,
-	},
+	// 标记 app 级 bus 是否已订阅，防止重复叠加
+	_busSubscribed: false,
 
 	/**
-	 * 注销全局 bus 事件监听，防止重复订阅叠加
+	 * 注销全局 bus 事件监听（重置订阅标志，下次 registerBusListeners 时重新订阅）
 	 */
 	unregisterBusListeners() {
-		const plugin = this.globalData.ppScale.plugin;
-		if (!plugin) return;
-		const cbs = this._busCallbacks;
-		if (cbs.connectState) {
-			plugin.bus.unsubscribe('connectState', cbs.connectState);
-			cbs.connectState = null;
-		}
-		if (cbs.syncDeviceTimeSuccess) {
-			plugin.bus.unsubscribe('syncDeviceTimeSuccess', cbs.syncDeviceTimeSuccess);
-			cbs.syncDeviceTimeSuccess = null;
-		}
-		if (cbs.deviceWillDisconnect) {
-			plugin.bus.unsubscribe('deviceWillDisconnect', cbs.deviceWillDisconnect);
-			cbs.deviceWillDisconnect = null;
-		}
+		this._busSubscribed = false;
 	},
 
 	/**
 	 * 注册全局 bus 事件监听（connectState / syncDeviceTimeSuccess / deviceWillDisconnect）
-	 * 调用前先 unsubscribe 旧的，防止多次 onShow 导致回调叠加
+	 * 通过标志位防止多次 onShow 导致回调叠加（SDK bus 不支持 unsubscribe）
 	 */
 	registerBusListeners() {
-		this.unregisterBusListeners();
+		if (this._busSubscribed) return;
+		this._busSubscribed = true;
 		const plugin = this.globalData.ppScale.plugin;
 
 		// 蓝牙连接状态监听
-		this._busCallbacks.connectState = (res) => {
+		plugin.bus.subscribe('connectState', (res) => {
 			console.log("app.js ===> connectState", res);
 			this.setGlobalData('ppScale.device.connectState', res);
 			if (res == plugin.BLUE_STATE.CONNECTSUCCESS) {
@@ -198,22 +181,18 @@ App({
 				this.reconnectDevice();
 			}
 			wx.hideLoading();
-		};
+		});
 
 		// 同步时间
-		this._busCallbacks.syncDeviceTimeSuccess = (res) => {
+		plugin.bus.subscribe('syncDeviceTimeSuccess', (res) => {
 			console.log("app.js ===> syncDeviceTimeSuccess", res);
-		};
+		});
 
 		// 设备自动断开监听
-		this._busCallbacks.deviceWillDisconnect = (res) => {
+		plugin.bus.subscribe('deviceWillDisconnect', (res) => {
 			console.log("app.js ===> deviceWillDisconnect", res);
 			this.setGlobalData('ppScale.device.connectState', plugin.BLUE_STATE.CONNECTFAILED);
-		};
-
-		plugin.bus.subscribe('connectState', this._busCallbacks.connectState);
-		plugin.bus.subscribe('syncDeviceTimeSuccess', this._busCallbacks.syncDeviceTimeSuccess);
-		plugin.bus.subscribe('deviceWillDisconnect', this._busCallbacks.deviceWillDisconnect);
+		});
 	},
 
 	/**