补充准备标志修改，并移除重连，防止异常

app/src/main/java/com/grkj/iscs/BusinessManager.kt

@@ -571,7 +571,7 @@ object BusinessManager {
         val listener = connectListeners[0]
         if (ActivityUtils.currentActivity() == null) {
             LogUtil.w("Ignore connectKey : ${listener.mac} no current activity")
-            connectKey()
+            isPreparing = false
             return
         }
         prepareBle(listener.mac, ActivityUtils.currentActivity() as BaseActivity<*>, false) { isDone, bleBean ->