The SOC in kobo Clara support USB OTG, see "IMX6SLLCEC - i.MX 6SLL Applications Processors for Consumer Products.pdf"
Quote:
• USB:
— Two High Speed (HS) USB 2.0 OTG (Up to 480 Mbps), with integrated HS USB PHY
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But I am not sure if the onboard circuit supports USB OTG.