performance enhancements

memory enhancements
prevent starting sensors more than once
fix for wifi lag issues
map scaling for huge buildings

sensors/android/WiFiSensorAndroid.h

@@ -9,6 +9,8 @@
 #include "../../misc/Debug.h"
 #include "../WiFiSensor.h"
 
+#include <Indoor/misc/Debug.h>
+
 class WiFiSensorAndroid : public WiFiSensor {
 
 private:
@@ -30,11 +32,11 @@ public:
 
 		// do NOT start twice!
 		if (started) {return;}
+		started = true;
 
 		// start scanning
 		int res = QAndroidJniObject::callStaticMethod<int>("indoor/java/WiFi", "start", "()I");
 		if (res != 1337) {throw Exception("error while starting WiFi");}
-		started = true;
 
 	}
 
@@ -46,7 +48,11 @@ public:
 		return started;
 	}
 
-	/** called from java. handle the given incoming scan result */
+	/**
+	 * called from WiFi.java
+	 * handle the given incoming scan result
+	 * just a bit curious, thus std::string instead of std::string&
+	*/
 	void handle(const std::string data) {
 
 		// to-be-constructed sensor data
@@ -68,6 +74,16 @@ public:
 		// call listeners
 		informListeners(sensorData);
 
+		// interval debug
+//		static Timestamp lastTS;
+//		const Timestamp diff = curTS - lastTS;
+//		Log::add("wifi", std::to_string(diff.ms()));
+//		if (diff.ms() > 650) {
+//			Log::add("wifi", "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
+//		}
+//		lastTS = curTS;
+
+
 	}
 
 };