It's still so disappointing that the left port works as EITHER charging or USB host, but not both. I just received my USB Hub and wanted to use my Gemini with my Sentio Superbook I received. Unfortunately, if I follow the device here and turn off the Gemini, connect the hub, and turn on the Gemini, I do get power via the hub, but now I can't connect my Superbook. If I disconnect the hub and reconnect it (with the Gemini on), I can now use the hub as a hub, and now I can connect my Superbook - but now charging doesn't work. So as an end result, I can only use the Gemini with my Superbook with the Gemini running on battery. That really limits it's usage. The right port does not support using the Superbook. I'm hoping the next version of the Gemini does a little better with the USB-C ports.
That's obvious, that you cannot use one USB port for charging and in OTG mode simultaneously. MicroUSB or USB-C prot may work either in passive mode (as a device, which takes power from USB, like a disk drive, mouse, keyboard ethernet adapter and so on) or in active mode (as a device, which give power to a device connected to it, like PC). Normally, a mobile device (like smartphone) is a passive USB device. When its port switches to an active mode, it's callet OTG (On-the-Go). Of course, it cannot receive power in OTG mode, 'cause it gives power by the same wires.
So, the problem is not that you can't use USB OTG hub as an OTG hub and charge your device thru it at the same time. That's the only way USB can work.
The problem is that USB prots of Gemini PDA are different. One of them can be used for charging and in OTG mode. The sceond one cannot be use neither way.
I hope, this problem will be fixed in Cosmo Communicator, so either both ports will be the interchangeable, or at least one of them could be used for charging and another one in OTG mode.
