Karabiner configuration for RDing/PCSensor USB pedal

private.xml

<?xml version="1.0"?>
<root>
    <devicevendordef>
        <vendorname>RDing</vendorname>
        <vendorid>0x0c45</vendorid>
    </devicevendordef>
    <deviceproductdef>
        <productname>FootSwitch1F1</productname>
        <productid>0x7403</productid>
    </deviceproductdef>
    <item>
        <name>Custom settings</name>
        <item>
            <name>For RDing/PCSensor foot pedal</name>
            <!-- This is the configuration for my single pedal. I have not
            used any mapping software to replace the configuration, so this is 
            what the pedal should send by default. -->
            <item>
                <name>Bind Pedal default mapping to Fn</name>
                <identifier>private.pedal_mapping</identifier>
                <device_only>DeviceVendor::RDing, DeviceProduct::FootSwitch1F1</device_only>
                <autogen>__KeyToKey__ KeyCode::B, KeyCode::FN</autogen>
            </item>
        </item>
    </item>
</root>