fixed some potential issues with MAC addresses

added corresponding test-cases
switched to newer version of tinyxml due to some issues
adjusted affected code-parts accordingly
for better re-use, moved ceiling-calculation to a new class
some minor fixes
new helper methods
worked on wifi-opt

sensors/radio/setup/WiFiFingerprints.h

@@ -0,0 +1,125 @@
+#ifndef WIFIFINGERPRINTS_H
+#define WIFIFINGERPRINTS_H
+
+#include <fstream>
+
+#include "WiFiFingerprint.h"
+
+
+/**
+ * helper class to load and save fingerprints.
+ * fingerprints are wifi-measurements given at some known location
+ * those can be used to e.g. optimize access-point models etc.
+ */
+class WiFiFingerprints {
+
+private:
+
+	/** 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();
+	}
+
+	const std::vector<WiFiFingerprint>& getFingerprints() const {
+		return fingerprints;
+	}
+
+	/** get all fingerprints that measured exactly the given mac [no VAP grouping] */
+	const std::vector<WiFiFingerprint> getFingerprintsFor(const MACAddress& mac) const {
+
+		std::vector<WiFiFingerprint> res;
+
+		// process each fingerprint location
+		for (const WiFiFingerprint& _fp : fingerprints) {
+
+			// start with an empty copy
+			WiFiFingerprint fp = _fp; fp.measurements.entries.clear();
+
+			// only add the measurements that belong to the requested mac
+			for (const WiFiMeasurement& _m : _fp.measurements.entries) {
+				if (_m.getAP().getMAC() == mac) {
+					fp.measurements.entries.push_back(_m);
+				}
+			}
+			if (fp.measurements.entries.size() > 0) {	// got some measurements for this AP?
+				res.push_back(fp);
+			}
+		}
+
+		return res;
+
+	}
+
+	/** deserialize the model */
+	void load() {
+
+		// open and check
+		std::ifstream inp(file.c_str());
+		if (inp.bad() || inp.eof() || ! inp.is_open()) { return; }
+
+		// read all entries
+		while (!inp.eof()) {
+
+			// each section starts with [fingerprint]
+			std::string section;
+			inp >> section;
+			if (inp.eof()) {break;}
+			if (section != "[fingerprint]") {throw Exception("error!");}
+
+			// deserialize it
+			WiFiFingerprint wfp;
+			wfp.read(inp);
+			if (wfp.measurements.entries.empty()) {continue;}
+			fingerprints.push_back(wfp);
+
+		}
+
+		inp.close();
+
+	}
+
+
+	/** serialize the model */
+	void save() {
+
+		// open and check
+		std::ofstream out(file.c_str());
+		if (out.bad()) {throw Exception("error while opening " + file + " for write");}
+
+		// write all entries
+		for (const WiFiFingerprint& wfp : fingerprints) {
+			out << "[fingerprint]\n";
+			wfp.write(out);
+		}
+
+		// done
+		out.close();
+
+	}
+
+	/** get the fingerprint for the given location. if no fingerprint exists, an empty one is created! */
+	WiFiFingerprint& getFingerprint(const Point3 pos_m) {
+
+		// try to find an existing one
+		for (WiFiFingerprint& wfp : fingerprints) {
+			// get within range of floating-point rounding issues
+			if (wfp.pos_m.getDistance(pos_m) < 0.01) {return wfp;}
+		}
+
+		// create a new one and return its reference
+		WiFiFingerprint wfp(pos_m);
+		fingerprints.push_back(wfp);
+		return fingerprints.back();
+
+	}
+
+};
+
+#endif // WIFIFINGERPRINTS_H