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It looks like the UsbManager is gone in the build. How do we communicate with usb peripherals now?
Things like usb->serial etc using https://github.com/mik3y/usb-serial-for-android
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Universal Serial Bus (USB) is a way to connect peripheral devices to computers. It replaces the functionality of serial and parallel ports, including keyboard and mouse ports. USB uses a bus topology, which means peripherals can be daisy-chained together or connected through hubs.
Currently the Peripheral HAL doesn't recognize usbserial based UART peripherals.
But if your usbserial device (ex: Arduino) exposes individual UART TX RX pins, you can communicate with it using the UART Peripheral API.
Caveat:
TX and RX when connecting the peripheral to the UART board of your development board
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It is stated on the known issues part of the release notes that USB support is disabled on the developer preview 1.
However I did a quick test on the Pi3 and high level peripherals such a keyboard work and send the correct events to the app. It is just the low level access what is disabled.
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