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Small Arduino prototypes often fail when moved into real environments. The cause is rarely one major bug. It is usually the accumulation of power noise, slow memory leaks, missing timeouts, and weak recovery behavior.
Many ESP32 projects run perfectly on a developer desk and collapse once deployed in apartments, offices, or industrial spaces with noisy Wi-Fi conditions. The main mistake is treating every disconnect as an exceptional event.
Outdoor deployments fail more from enclosure mistakes than from firmware defects. A box that looks sealed on day one can trap condensation, stress connectors, and destroy electronics over time.
OTA updates are high leverage and high risk. A weak update process can brick large parts of a fleet quickly. A strong one reduces support load and security risk while preserving device availability.
