[AI Generated]: feat(*): 新增 autoConnect 自动重连机制、OTA 断连兜底触发，修复 diff 为零时颜色与箭头展示异常

miniprogram/lefu/service.ts

@@ -20,8 +20,8 @@ const plugin = requirePlugin('ppScale-plugin') as LeFuPlugin
 const LEFU_CONFIG: LeFuConfig = {
     key: 'lefudc91611833e18d94',
     secret: 'eQ50JYimMp0X7uhNLj6D3lTEk4TUUvEG7dvaqKM9t1U=',
-    domain1: 'http://192.168.1.207:8889',
-    domain2: 'http://192.168.1.207:8889/weight',
+    domain1: 'http://10.10.10.10:8889',
+    domain2: 'http://10.10.10.10:8889/weight',
     // domain1: 'http://device.shuziweidao.com:80/gateway',
     // domain2: 'http://device.shuziweidao.com:80/weight',
 }
@@ -200,8 +200,6 @@ class LeFuService {
         this._activeProtocol = null
         this._connectState = ''
         this._deviceInfo = null
-        this._onDeviceInfoCb = null
-        this._onDeviceConnectCb = null
         // 直连缓存设备时不走 startScan，需手动初始化插件设备配置和总线订阅
         plugin.Blue.setDeviceSetting(DEVICE_SETTINGS)
         this._subscribeBus()
@@ -217,12 +215,42 @@ class LeFuService {
         plugin.Blue.disconnect()
     }
 
+    /** 读缓存设备信息，自动扫描匹配后连接，已连接或无缓存时直接返回 */
+    autoConnect(): void {
+        if (this.isConnected) return
+        const cached = wx.getStorageSync('connectDeviceInfo') as RawDevice | null
+        const targetDeviceId = cached?.deviceId as string | undefined
+        if (!targetDeviceId) return
+
+        let scanTimer: number | null = null
+
+        wx.openBluetoothAdapter({
+            success: () => {
+                scanTimer = setTimeout(() => {
+                    this.stopScan()
+                }, 15000)
+
+                this.onDevicesList((devices) => {
+                    const matched = devices.find(d => d.raw.deviceId === targetDeviceId)
+                    if (!matched) return
+                    if (scanTimer !== null) { clearTimeout(scanTimer); scanTimer = null }
+                    this.stopScan()
+                    wx.setStorageSync('connectDeviceInfo', matched.raw)
+                    this.connect(matched.raw)
+                })
+                this.startScan()
+            },
+            fail: () => {
+                if (scanTimer !== null) { clearTimeout(scanTimer); scanTimer = null }
+            },
+        })
+    }
+
     stopScan(): void {
         console.log(TAG, 'stopScan()')
         this._stopReconnectTimer()
         wx.stopBluetoothDevicesDiscovery()
         this._onDevicesListCb = null
-        this._onDeviceConnectCb = null
     }
 
     // ─── WiFi 配网 ────────────────────────────────