Reading data from USB Port
<p>currently I am working on a project for university where i have to create a program which controls the humidity in a terrarium. 
On this purpose i've got an hygrometer. </p>

<p>First of all the program has to import the raw data from the hygrometer, but i have no idea how it works. 
The documentation says there is an USB interface for it, but i can only find the way how to parse the raw data.
I also wrote an Email to the company which sells this hygrometer. They said theres an external software which imports and handle with this data. However I am not allowed to use external softwares. 
Therefore I am forced to read the raw data directly from the USB Port. I tried to work with usb4java but i was only able to find all connected usb devices. 
I have no idea how to go on. Please help me 
<a href="https://i.stack.imgur.com/ck1PC.png" rel="nofollow noreferrer">documentation</a>
<a href="https://i.stack.imgur.com/KKtlf.png" rel="nofollow noreferrer">documentation</a></p>

<p>Code below</p>

<pre><code>public class DumpDevices
{
/**
 * Dumps the specified USB device to stdout.
 * 
 * @param device
 *            The USB device to dump. 
 */


private static void dumpDevice(final UsbDevice device)
{
    // Dump information about the device itself
    System.out.println(device);
    final UsbPort port = device.getParentUsbPort();
    if (port != null)
    {
        System.out.println("Connected to port: " + port.getPortNumber());
        System.out.println("Parent: " + port.getUsbHub());
    }

    // Dump device descriptor
    System.out.println(device.getUsbDeviceDescriptor());

    // Process all configurations
    for (UsbConfiguration configuration: (List&lt;UsbConfiguration&gt;) device
        .getUsbConfigurations())
    {
        // Dump configuration descriptor
        System.out.println(configuration.getUsbConfigurationDescriptor());

        // Process all interfaces
        for (UsbInterface iface: (List&lt;UsbInterface&gt;) configuration
            .getUsbInterfaces())
        {
            // Dump the interface descriptor
            System.out.println(iface.getUsbInterfaceDescriptor());

            // Process all endpoints
            for (UsbEndpoint endpoint: (List&lt;UsbEndpoint&gt;) iface
                .getUsbEndpoints())
            {
                // Dump the endpoint descriptor
                System.out.println(endpoint.getUsbEndpointDescriptor());
            }
        }
    }

    System.out.println();

    // Dump child devices if device is a hub
    if (device.isUsbHub())
    {
        final UsbHub hub = (UsbHub) device;
        for (UsbDevice child: (List&lt;UsbDevice&gt;) hub.getAttachedUsbDevices())
        {
            dumpDevice(child);
        }
        System.out.println(hub);
    }
}


/**
 * Main method.
 * 
 * @param args
 *            Command-line arguments (Ignored)
 * @throws UsbException
 *             When an USB error was reported which wasn't handled by this
 *             program itself.
 */
public static void main(final String[] args) throws UsbException
{
    // Get the USB services and dump information about them
    final UsbServices services = UsbHostManager.getUsbServices();
    System.out.println("USB Service Implementation: "
        + services.getImpDescription());
    System.out.println("Implementation version: "
        + services.getImpVersion());
    System.out.println("Service API version: " + services.getApiVersion());
    System.out.println();

    // Dump the root USB hub
    dumpDevice(services.getRootUsbHub());
}
</code></pre>