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The WiFiMon test server includes configured templates from NetTest, Boomerang and SpeedTests (HTML5), which provide information about RTTs and ping (ICMP) network relevant data like bandwidth and latency (represented in Figure 2B 2 as lines marked as 2.1, 2.2, and 2.5). A standard image size is downloaded for NetTest, and for Boomerang it can be customisable to a maximum of 5 MByte size. The location of the WTS and its topological distance from the monitored WiFi network has a major impact on the crowdsourced measurement accuracy and reliability. You can read more about this here.
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The WiFiMon Software Probe takes the form of JavaScript integrated in often visited web pages, Figure 3. It includes the domain of the WiFiMon agent (e.g., wifimon.switch.ch), the listening agent port (8443) and the image location/path (e.g. https://eipa19.eipa.ttu.ee/wifimon/images/) as well as the cookie expiration time. The default value of this cookie is 1.5 min (currently) if it is not explicitly set in the WiFiMon test server.
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The Analysis Server includes the WiFiMon agent, Elasticsearch, Logstash and the WiFiMon UI with Kibana for customising customizing reports and their visualisationvisualization. The WiFiMon agent checks the subnet (2.3, 2.4) of a monitored device visiting the website that includes the JavaScript lines (see Fig. B) and downloads available images from the WiFiMon Test server (2.5). Network performance metrics are calculated and streamed from the end user to the WiFiMon Analysis Server (2.6). Furthermore, the WAS correlates performance data with client IPs and AP-IDs (2.7/2.8).
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