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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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:
- Don't forget to cross
TXandRXwhen connecting the peripheral to the UART board of your development board
- On Raspberry Pi 3, the console needs to be disabled, see: UART peripherals on Android Things for Raspberry Pi 3
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1This is a good explanation of using a uart but what I'm really trying to find out is if there will be full usb support. I would like to eventually build an expansion board with cell, gps, and possible other peripherals. Being limited by the number of uarts could be a setback. – annymsMthd Dec 15 '16 at 00:03
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Ideally the HAL would add new `UartDevice` to the [Peripheral API](https://android-dot-devsite.googleplex.com/things/sdk/pio/uart.html) as they get plugged in. Maybe you can file a [feature request](https://code.google.com/p/android/issues/entry?template=Android%20Things%20feature%20request)? – proppy Dec 15 '16 at 02:25
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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.
shalafi
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As @devunwired commented in the Google's IoT Developers Community: USB accessory support is not currently enabled is the RC1 preview.