user 18933ea778 feat: Add v0.2 remote management — UDP commands, LED, NVS persistence ...

Firmware (app_main.c):
- UDP command listener on port 5501 (configurable via Kconfig)
- Commands: REBOOT, IDENTIFY, STATUS, RATE, POWER
- LED status indicator on GPIO2 (off/slow/fast blink/solid)
- NVS persistence for send_rate and tx_power settings
- Refactored ping to support stop/restart for dynamic rate changes
- TX power control via esp_wifi_set_max_tx_power()

Pi-side tooling:
- tools/esp-cmd: standalone Python3 UDP client for device management

Tested on amber-maple (ESP32 v3.1) with ESP-IDF v5.5.2.

2026-02-04 15:36:14 +01:00

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