kazu
4f511d907e
needed interface changes [new options] logger for android wifi-ap-optimization new test-cases
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
#ifndef WIFIFINGERPRINT_H
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#define WIFIFINGERPRINT_H
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#include "../../../geo/Point3.h"
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#include "../WiFiMeasurements.h"
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#include <unordered_map>
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/**
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* denotes a wifi fingerprint
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* known position and several measurements conducted at this position
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*
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* as several measurements were conducted, each AP is usually contained more than once!
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*/
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struct WiFiFingerprint {
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/** real-world-position that was measured */
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Point3 pos_m;
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/** measurements (APs) at the given location */
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WiFiMeasurements measurements;
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/** ctor */
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WiFiFingerprint() {;}
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/** ctor */
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WiFiFingerprint(const Point3 pos_m) : pos_m(pos_m) {;}
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/** as each AP is contained more than once (scanned more than once), group them by MAC and use the average RSSI */
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WiFiMeasurements average() {
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// group scans by MAC (all measurements for one AP)
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std::unordered_map<MACAddress, WiFiMeasurements> group;
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for (WiFiMeasurement& m : measurements.entries) {
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group[m.getAP().getMAC()].entries.push_back(m);
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}
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// create the output that contains the AP's average
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WiFiMeasurements res;
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for (auto& it : group) {
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const WiFiMeasurements& apMeasurements = it.second;
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WiFiMeasurement avg = apMeasurements.entries.front(); // average starts with a copy of the first entry (to get all data-fields beside the rssi)
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for (int i = 1; i < (int)apMeasurements.entries.size(); ++i) { // sum up all other entries [1:end]
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avg.rssi += apMeasurements.entries[i].rssi;
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}
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avg.rssi /= apMeasurements.entries.size();
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res.entries.push_back(avg); // add to output
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}
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// done
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return res;
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}
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/** serialize */
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void write(std::ostream& out) const {
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out << "pos: " << pos_m.x << " " << pos_m.y << " " << pos_m.z << "\n";
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out << "num: " << measurements.entries.size() << "\n";
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for (const WiFiMeasurement& wm : measurements.entries) {
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out << wm.getTimestamp().ms() << " " << wm.ap.getMAC().asString() << " " << wm.getRSSI() << "\n";
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}
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}
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/** deserialize */
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void read(std::istream& inp) {
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std::string tmp;
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// read the position
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inp >> tmp; if ("pos:" != tmp) {throw "error";}
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inp >> pos_m.x >> pos_m.y >> pos_m.z;
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// number of entries
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inp >> tmp; if ("num:" != tmp) {throw "error";}
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int numEntries; inp >> numEntries;
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// read the entries
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for (int i = 0; i < numEntries; ++i) {
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uint64_t ms; inp >> ms;
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std::string mac; inp >> mac;
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float rssi; inp >> rssi;
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WiFiMeasurement wm(AccessPoint(MACAddress(mac)), rssi, Timestamp::fromMS(ms));
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measurements.entries.push_back(wm);
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}
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}
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};
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#endif // WIFIFINGERPRINT_H
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