Error opening USB imaging device: -3

[ThomasH-W]

I can control a Nikon D7000 when connecting to a Windows-PC with the qDslrDashboard. It is also possible to release the shutter using an arduino connected to the Nikon.

Now when running the DDserver on a rapsberry Pi0 w with Jessie, I do get error mentioned in the title. Where should I go from here ?

As a reference: here is the syslog:

Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.736956] usb 1-1: new high-speed USB device number 9 using dwc_otg Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.737327] Indeed it is in host mode hprt0 = 00001101 Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.937743] usb 1-1: New USB device found, idVendor=04b0, idProduct=0428 Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.937771] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.937783] usb 1-1: Product: NIKON DSC D7000 Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.937794] usb 1-1: Manufacturer: NIKON Mar 9 18:44:30 DSLRpi0 kernel: [ 4680.937804] usb 1-1: SerialNumber: 000006311502

Mar 9 18:39:11 DSLRpi0 ddserver: Starting socket server on port 4757 Mar 9 18:39:11 DSLRpi0 ddserver: Awaiting client connection Mar 9 18:39:11 DSLRpi0 ddserver: Starting UDP listener Mar 9 18:39:11 DSLRpi0 ddserver: join multicast group: 224.1.2.3 Mar 9 18:39:18 DSLRpi0 ddserver: Incoming client connection Mar 9 18:39:18 DSLRpi0 ddserver: Awaiting client connection Mar 9 18:39:18 DSLRpi0 ddserver: USB Devices in Mar 9 18:39:18 DSLRpi0 ddserver: Number of possible configurations: 1 Device Class: 0 VendorID: 1200, ProductID: 1064 Mar 9 18:39:18 DSLRpi0 ddserver: Number of alternate settings: Mar 9 18:39:18 DSLRpi0 ddserver: Interface class: 6 Interface number: 0 Number of endpoints: 3 Mar 9 18:39:18 DSLRpi0 ddserver: Found USB imaging device, get vendor and product Mar 9 18:39:18 DSLRpi0 ddserver: Error opening USB imaging device: -3 Mar 9 18:39:18 DSLRpi0 ddserver: Number of possible configurations: 1 Device Class: 9 VendorID: 7531, ProductID: 2 Mar 9 18:39:18 DSLRpi0 ddserver: Number of alternate settings: Mar 9 18:39:18 DSLRpi0 ddserver: Interface class: 9 Interface number: 0 Number of endpoints: 1 Mar 9 18:39:18 DSLRpi0 ddserver: Imaging USB devices found: 0 Mar 9 18:39:18 DSLRpi0 ddserver: Error reading total packet size: 0 Mar 9 18:39:18 DSLRpi0 ddserver: Stoping client Mar 9 18:39:20 DSLRpi0 ddserver: Closing USB device

[hubaiz]

I guess that ddserver can't access the USB device as it is probably automatically mounted by the system.

[ThomasH-W]

Just found the solution: need to start the ddserver as root: sudo ./ddserver Probably worth of adding this to the installation guide.