当使用sn作为cmdid时，也能自动启动

app/src/main/java/com/xypower/mpapp/MainActivity.java

@@ -193,7 +193,8 @@ public class MainActivity extends AppCompatActivity {
 
         MicroPhotoContext.AppConfig appConfig = getAppConfig();
         if (TextUtils.isEmpty(appConfig.cmdid)) {
-            binding.cmdid.setText(MicroPhotoService.getSerialNumber());
+            appConfig.cmdid = MicroPhotoService.getSerialNumber();
+            binding.cmdid.setText(appConfig.cmdid);
         } else {
             binding.cmdid.setText(appConfig.cmdid);
         }