ESP32 sensor prototype with MQTT logging

We need a small, fixed-scope prototype for an ESP32 test board. Budget is €130, so please only apply if you can keep it tight and practical. Goal: - read one sensor input on ESP32 - send the value via MQTT to a local broker - add basic reconnect logic - provide the Arduino/ESP32 code and a short setup note What we already have: - ESP32 dev board - MQTT broker running on our side - pin assignment and test data format Success criteria: - data publishes every 10 seconds - reconnect works after Wi‑Fi drop - code is readable and commented This is a quick implementation, not a full product build.