Pixhawk Relay Switch AUX OUT to flash LED strobe light?

Hi, I am a freshman of drone and plan to build a Pxhawk drone and also like to use Pixhawk to control LED navigation light and strobe light instead of an independent LED control kit, like this or many other kits.

By other discussion, I learn Relay Switch, AUX OUT 5 & 6 can be set as relay to switch on/ off the navigation light though I haven't tested it. (Someone has tested it.) I just need the navigation light to be on or off and stay steady, but I want to flash the strobe light at a fixed frequency, like on-off-on-off in 1 sec, recycling after another 1 sec.

Is there a way to make the Relay Switch AUX OUT 5&6 on/off at a programmable frequency to blink the strobe light by editing the firmware code? If not, any simple hardware solution?  

Suggestions or comments would be appreciated! 

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