Node / meshtastic / Meshtastic-Android / files / app / src / main / java / com / geeksville / mesh / repository / usb / README.md

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Tc9d1d9# USB Module

This module provides a repository for acessing USB devices.

Tc9d1d9## Device Support

In order to be picked up, devices need to be supported by two different mechanisms:

Tff7b72- Android needs to be supplied with a device filter so that it knows what devices to inform

the app about. These are expressed as vendor and device IDs in Ta5d6ff`src/res/xml/device_filter.xml`.

Tff7b72- The USB driver library also needs to have a mapping between the vendor + device IDs and the

driver to use for communications. Many mappings are already natively supported by the driver

but unknown devices can have manual mappings added via Ta5d6ff`ProbeTableProvider`.

The [Tff7b72Serial USB Terminal](Te6edf3https://play.google.com/store/apps/details?id=de.kai_morich.serial_usb_terminal)

app in the Google Play Store seems to be a good app for determining both the vendor and

device IDs as well as testing different underlying drivers.

Tc9d1d9## Testing

When granting permissions to a USB device, the Android platform remembers the user's decision.

In order to test the permission granting logic, re-install the app. This will cause Android

to forget previously granted permissions and will re-trigger the permission acquisition logic.