fixed some issues

some new helper methods
added listener-support to offline-reader

sensors/radio/setup/WiFiFingerprints.h

@@ -15,22 +15,37 @@ class WiFiFingerprints {
 
 private:
 
-	/** the file to save the calibration model to */
-	std::string file;
+//	/** the file to save the calibration model to */
+//	std::string file;
 
 	/** all fingerprints (position -> measurements) within the model */
 	std::vector<WiFiFingerprint> fingerprints;
 
 public:
 
-	WiFiFingerprints(const std::string& file) : file(file) {
-		load();
+	/** empty ctor */
+	WiFiFingerprints() {
+
+	}
+
+	/** ctor from file */
+	WiFiFingerprints(const std::string& file) {
+		load(file);
 	}
 
 	const std::vector<WiFiFingerprint>& getFingerprints() const {
 		return fingerprints;
 	}
 
+	std::vector<WiFiFingerprint>& getFingerprints() {
+		return fingerprints;
+	}
+
+	/** attach the given fingerprint */
+	void add(const WiFiFingerprint& fp) {
+		fingerprints.push_back(fp);
+	}
+
 	/** get all fingerprints that measured exactly the given mac [no VAP grouping] */
 	const std::vector<WiFiFingerprint> getFingerprintsFor(const MACAddress& mac) const {
 
@@ -58,7 +73,7 @@ public:
 	}
 
 	/** deserialize the model */
-	void load() {
+	void load(const std::string& file) {
 
 		// open and check
 		std::ifstream inp(file.c_str());
@@ -87,7 +102,7 @@ public:
 
 
 	/** serialize the model */
-	void save() {
+	void save(const std::string& file) {
 
 		// open and check
 		std::ofstream out(file.c_str());