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Headless Raspberry Pi hangs are unfixable remotely. The bcm2835 hardware watchdog can force a defined reboot when software stops kicking the timer, giving unattended nodes predictable recovery at the cost of visibility.
Learn how to build a stable, headless Raspberry Pi IoT gateway using read-only filesystems, hardware watchdogs, and strict logic-level boundaries to prevent SD corruption and downtime.
Goal is to use the Broadcom SoC hardware watchdog exposed by the bcm2835-wdt driver via /dev/watchdog together with systemd RuntimeWatchdogSec for unattended Raspberry Pi operation. The integration requires the kernel driver to be present, userspace to keep the watchdog alive, and a clear definition of when the watchdog is armed or disarmed across boot trans
raspberrypi