Create a box into which one can plug in a USB keyboard or mouse, and it becomes wirelessly visible as a Bluetooth keyboard or mouse. Does this already exist? Searches are dominated by adapters adding Bluetooth capability to a computer, not to a device.
The application was to use a USB keyboard with a smartphone. The obvious solution, USB OTG, drains the phone battery extremely quickly. And since the keyboard is plugged into the only micro USB port, one cannot simultaneously charge the phone.
The converter box could be AC powered.
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