I found that after watch tv ,the usb tv stick still working with green light .following command to disable usb port of router(gpio value for wdr3600 only )
poweroff usb port
echo 0 > /sys/class/gpio/gpio22/value
poweron usb port
echo 1 > /sys/class/gpio/gpio22/value
scan the program schedule at midnight ,setup a cron job (need to install curl package)
#enable eit dvb grbber
curl -d 'op=saveSettings&external=[{"id":"eit","enabled":1}]' http://192.168.0.1:9981/epggrab
curl -d 'op=save&name=Legend%20Silicon%20LGS8913%2FLGS8GXX%20DMB-TH&enabled=on&skip_initialscan=on&idlescan=on&idleclose=on&skip_checksubscr=on&full_mux_rx=1&grace_period=30&disable_pmt_monitor=on&nitoid=0&extrapriority=0' http://192.168.0.1:9981/dvb/adap ... 8913_LGS8GXX_DMB_TH
#disabel eit:dvb grabber
curl -d 'op=saveSettings&external=[{"id":"eit","enabled":0}]' http://192.168.0.1:9981/epggrab
#curl -d 'op=saveSettings&external=[{"id":"eit","enabled":1}]' http://192.168.0.1:9981/epggrab
curl -d 'op=save&name=Legend%20Silicon%20LGS8913%2FLGS8GXX%20DMB-TH&enabled=on&skip_initialscan=on&idleclose=on&skip_checksubscr=on&full_mux_rx=1&grace_period=30&disable_pmt_monitor=on&nitoid=0&extrapriority=0' http://192.168.0.1:9981/dvb/adap ... 8913_LGS8GXX_DMB_TH
logger -t tvheadend disable epggrab subscription: unsubscribing epggrab |