config system option hostname OpenWrt option timezone UTC config timeserver ntp list server 0.openwrt.pool.ntp.org list server 1.openwrt.pool.ntp.org list server 2.openwrt.pool.ntp.org list server 3.openwrt.pool.ntp.org config led option default 1 option name Heartbeat option sysfs 'net5501:1' option trigger heartbeat