[Help] USB OTG RS-232

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Hi all

I use this app with my nexus 7 (2012) daily, since getting my nexus 7 (2013) it doesn't work.
It seems I cannot power the serial port ( doesnt support power input).
Is there any other way of getting more power to the usb? I will be out and about so no mains power.
Would a USB Y cable with external power help at all?
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