Dual OTA partition table (ota_0/ota_1, 1920 KB each) on 4MB flash.
Firmware gains OTA command, LED_OTA double-blink, version in STATUS,
and automatic rollback validation. Pi-side esp-ota tool serves firmware
via HTTP and orchestrates the update flow. esp-fleet gains ota subcommand.
Firmware:
- mDNS announcement as <hostname>.local (configurable via Kconfig)
- Task watchdog with 30s timeout and auto-reboot on hang
- STATUS now returns human-readable uptime (e.g., 3d2h15m) and hostname
Pi-side tools:
- esp-cmd: mDNS hostname resolution (esp-cmd amber-maple.local STATUS)
- esp-fleet: parallel command to all sensors (esp-fleet status)
Tested on amber-maple — mDNS resolves, watchdog active, fleet tool works.
