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trezor-firmware/core/tools/hid-bridge/README.md

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# hid-bridge
Creates a virtual hid device which can be controlled by a user driver via a UDP port.
## Installation
You need Python 3.5 or higher.
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The uhid driver is required. If it is built as a module and not loaded, load it by `modprobe uhid`.
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You must have read/write permission to the `/dev/uhid/` device as well as to the newly created `/dev/hidraw*` device. This may be accomplished by copying `50-hid-bridge.rules` into `/etc/udev/rules.d/`. You may need to reload the driver afterwards.
## Usage
Run [Trezor emulator](https://github.com/trezor/trezor-core/blob/master/docs/emulator.md) and `./hid-bridge`.
## Known issues
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It does not work with some older versions of Firefox. Firefox used to close hid devices upon loss of focus.
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It does not work with the emulator in debug mode since the emulator doesn't start the hid interface in debug mode.