hidDevice.open() return NULL

[Chakib-Temal]

hello

i use your libraries Hid4Java on My Ubuntu 16.04

all is fine to detect devices and read them parameters

but when i call
HidDevice hidDevice = hidServices.getHidDevice(6753, 13904, null);
i have null result
it's a FreeStyle Libre device, and it's detectable with hidServices.getAttachedHidDevices()

i'm trying to find the problem , i'm sure it"s the Path
HidDevice [path=0001:0008:00, vendorId=0x1a61, productId=0x3650, serialNumber=null, releaseNumber=0x100, manufacturer=null, product=null, usagePage=0x0, usage=0x0, interfaceNumber=0]

but the function return Null , there is any problem with the path path=0001:0008:00 ?

if i can't to connect to the device , i can't communicate with him

any suggestion ? Thank's a lot

[Youw]

what is the version of hidapi?

HidDevice [path=0001:0008:00, vendorId=0x1a61, productId=0x3650, serialNumber=null, releaseNumber=0x100, manufacturer=null, product=null, usagePage=0x0, usage=0x0, interfaceNumber=0]

How did you get this output?

manufacturer=null, product=null

this output is extremely rare and usually means broken HID driver or broken device

Have you tried native C app to open your device?
Check https://github.com/todbot/hidapitester

---

This version of the library is no longer maintained (original author is not answering).
See #373

Check https://github.com/libusb/hidapi

[Chakib-Temal]

for (int devices = 0 ; devices < hidServices.getAttachedHidDevices().size() ; devices++) {
System.out.println(hidServices.getAttachedHidDevices().get(devices));
}

here is the output :
HidDevice [path=0002:0004:00, vendorId=0x413c, productId=0x2003, serialNumber=null, releaseNumber=0x301, manufacturer=null, product=null, usagePage=0x0, usage=0x0, interfaceNumber=0]
HidDevice [path=0002:0003:00, vendorId=0x461, productId=0x4d81, serialNumber=null, releaseNumber=0x200, manufacturer=null, product=null, usagePage=0x0, usage=0x0, interfaceNumber=0]
HidDevice [path=0001:0008:00, vendorId=0x1a61, productId=0x3650, serialNumber=null, releaseNumber=0x100, manufacturer=null, product=null, usagePage=0x0, usage=0x0, interfaceNumber=0]

1-Mouse , 2- keyboard 3-FreeStyle libre(glucometer)
i'm not sure that is a broken device , you cann see the output for the mouse and the keyboard

i'm trying now to use the hidApiTester in the command line, but it's not very clear to start
todbot/hidapitester#1
may be you can help me if you already used it before ?