Spent about three calendar months (logged 120 hours IIRC) and few hundred EUR building a simple hardware product- small dongle to stream drone telemetry over W

Spent about three calendar months (logged 120 hours IIRC) and few hundred EUR building a simple hardware product- small dongle to stream drone telemetry over WiFi (MAVLink to WiFi bridge). Could sell just 5 of them, still have about 30 in stock, so commercial failure, but at least got two things out of it: 1) Bragging rights about having sold something to large aerospace organisation. 2) Finished something from start to finish.