I've long been curious about the effectiveness of the built-in antennas that are attached to common WiFi modules. Can that tiny, serpentine PCB track really match the performance of a "real" antenna? How does it even work?
I set up a quick test to find out. Using a pair of ESP8266 development modules, I set up a test measuring gateway ping times, and sending the resulting values to AWS IoT Core. Messages are routed to Firehouse, stored in S3, and aggregated with Athena. (AWS has put together an impressively elegant IoT pipeline, but that's a future post!)