ConnMan handles USB gadgets as uplink connections starting with 1.22 and can tether them since 1.17. It may be that the usb-moded somehow interferes with this or that something is not working properly with the particular USB gadget driver. We have seen USB gadget work both ways on the devices we can test with.
USB ethernet adapters have been working since day one, as they are indistinguishable from "normal" ethernet cards.
Can you elaborate on what approximately starts going wrong, perhaps by sending a mail to the ConnMan mailing list (see https://01.org/connman for info) ?
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