More details of my ongoing debugging. I found and enabled libusb debugging. Here are the relevant messages during claim_interface():
2016-09-06 17:02:56,824 DEBUG:usb.backend.libusb1:_LibUSB.claim_interface(<usb.backend.libusb1._DeviceHandle object at 0x1070d82d0>, 0) [19.661232] [00000a0b] libusb: debug [libusb_claim_interface] interface 0 [19.661742] [00000a0b] libusb: debug [get_endpoints] building table of endpoints. [19.661763] [00000a0b] libusb: debug [get_endpoints] interface: 0 pipe 1: dir: 0 number: 1 [19.661770] [00000a0b] libusb: debug [get_endpoints] interface: 0 pipe 2: dir: 1 number: 1 [19.661779] [00000a0b] libusb: error [get_endpoints] error getting pipe information for pipe 3: unknown error (0xe0004061) [19.661982] [00000a0b] libusb: error [darwin_claim_interface] could not build endpoint table --------------------------------------------------------------------------- USBError Traceback (most recent call last) I'm taking my debugging to the libusb-devel mailing list at this point. However, if anyone has any thoughts on my problem, I'd be happy to hear them. Thanks, Bob On Tue, Sep 6, 2016 at 4:31 PM, Bob Schmanski <bob.schman...@gmail.com> wrote: > After further debugging and digging, it does appear that the call to > "usblib_claim_interface()" is returning the value -99, not "None". "None" > is the output of _libusb_errno[ret] for return code -99, also defined as > LIBUSB_ERROR_OTHER. So, the real question is, why does claim_interface() > return -99? > > Thanks, > Bob > >
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