SecurityTrusted Platform Module (TPM)NOTE: For more information about the Trusted Platform Module, see https://developer.ubuntu.com/en/snappy/guides/security-whitepaper/.TPM is supported only on devices that have TPM hardware, and for those products which offer Snappy enhanced security support. TheTPM on/off setting is configurable in the BIOS and manageable in the operating system.Running command:admin@localhost:$ ls /dev/tpm0If TPM is turned off, the device node (/dev/tpm0) does not exist.(plano)ubuntu@localhost:$ ls /dev/tpm0Is: cannot access /dev/tpm0: No such file or directoryIf TPM is turned on, the device node (/dev/tpm0) exists.(plano)ubuntu@localhost:$ ls /dev/tpm0/dev/tpm0Watchdog Timer (WDT)NOTE: For more information about Watchdog Timer (WDT) commands, see www.sat.dundee.ac.uk/~psc/watchdog/Linux-Watchdog.html.It is recommended to enable the WDT by default to activate the fail-safe circuitry. Snappy, a WDT-compatible operating system providesthe capability to detect and recover the system from malfunctions or unexpected crashes.Running command:admin@localhost:$ systemctl show | grep –i watchdogReturns:RuntimeWatchdogUSec=10sShutdownWatchdogUSec=10minNOTE: The default value is 10. The actual value should be greater than 0.Restoring Ubuntu Core 16When the operating system is restored to the factory image, all data on the system is deleted. You can restore Ubuntu Core 16 operatingsystem to the factory image using one of the following methods:• Restore Ubuntu Core 16 from USB flash drive• Restore Ubuntu Core 16 from the recovery partition on the Edge Gateway– Option 1: Restoring from the operating system– Option 2: Restoring during system POST– Option 3: Restoring from boot menu (Edge Gateway 3003 only)Option 1: Restoring from the operating systemCAUTION: These steps will delete all the data on your Edge Gateway1. Connect the Edge Gateway remotely or through a KVM session.2. Log in to the operating system.3. Run the following command to trigger native eMMC recovery partition:.$ sudo efibootmgr -n $(efibootmgr | grep "factory_restore" | sed 's/Boot//g' | sed 's/[^0-9A-B]*//g') ; reboot54