many changes and updates

- changed the wifi-estimation api
- adjusted test-cases
- worked on grid-bulding and grid-importance
- new walking modules
- fixed some minor issues

sensors/radio/model/WiFiModelLogDist.h

@@ -9,21 +9,63 @@
  */
 class WiFiModelLogDist : public WiFiModel {
 
+public:
+
+	/** parameters describing one AP to the model */
+	struct APEntry {
+
+		Point3 position_m;	// the AP's position (in meter)
+		float txp;			// sending power (-40)
+		float exp;			// path-loss-exponent (~2.0 - 4.0)
+
+		/** ctor */
+		APEntry(const Point3 position_m, const float txp, const float exp) :
+			position_m(position_m), txp(txp), exp(exp) {;}
+
+	};
+
 private:
 
-	float txp;
-	float exp;
+	/** map of all APs (and their parameters) known to the model */
+	std::unordered_map<MACAddress, APEntry> accessPoints;
 
 public:
 
 	/** ctor */
-	WiFiModelLogDist(const float txp, const float exp) : txp(txp), exp(exp) {
+	WiFiModelLogDist() {
 		;
 	}
 
-	/** get the given access-point's RSSI at the provided location */
-	float getRSSI(const LocatedAccessPoint& ap, const Point3 p) override {
-		return LogDistanceModel::distanceToRssi(txp, exp, ap.getDistance(p));
+	/** make the given AP (and its parameters) known to the model */
+	void addAP(const MACAddress& accessPoint, const APEntry& params) {
+
+		// sanity check
+		Assert::isBetween(params.txp, -50.0f, -30.0f, "TXP out of bounds [-90:-30]");
+		Assert::isBetween(params.exp, 1.0f, 4.0f, "EXP out of bounds [1:4]");
+
+		// add
+		accessPoints.insert( std::pair<MACAddress, APEntry>(accessPoint, params) );
+
+	}
+
+	virtual float getRSSI(const MACAddress& accessPoint, const Point3 position_m) const override {
+
+		// try to get the corresponding parameters
+		const auto it = accessPoints.find(accessPoint);
+
+		// AP unknown? -> NAN
+		if (it == accessPoints.end()) {return NAN;}
+
+		// the access-points' parameters
+		const APEntry& params = it->second;
+
+		// free-space (line-of-sight) RSSI
+		const float distance_m = position_m.getDistance(params.position_m);
+		const float rssiLOS = LogDistanceModel::distanceToRssi(params.txp, params.exp, distance_m);
+
+		// done
+		return rssiLOS;
+
 	}
 
 };