I test using 2 phone LG Vu,

I test using 2 phone LG Vu, and Himax (Kitkat) with USB-OTG but when i tap connect, its give “No usb device found” notification. My printer is Rostock with marlin firmware.

@Ryan_Widi did you try the steps described in the FAQ ?
http://gcodesim.dietzm.de/FAQ.html#debug