Thanks again for your help, Charles. I was able to install the Tripp
Lite software on my Ubuntu machine, and it sort of works. It does
something which continually changes the USB device ID of the UPS, and
prints voluminous error messages in the log. However, one of the things
that it can do is to schedule a UPS shutdown, which Nut does not know
how to do.
So I monitored the USB port with wireshark (an interesting endeavor
since I didn't start out with any knowledge of USB protocols). But I
have managed to discover that when I ask Tripp Lite's poweralert
software to schedule a UPS shutdown, it does it by using the SET_REPORT
function of the USB HID protocol with ReportType "Feature", ReportID 21
(0x15), and 3 bytes of data which are 0x15 followed by the number of
seconds to wait before shutting down in two bytes, LSB first.
Below I include wireshark packet dissections for two such commands. The
difference is in the "data fragment". In the first case it is 150500,
representing a shutdown in 5 seconds, and the second 153701,
representing a shutdown in 311 = 0x0137 seconds.
Is this helpful?
Ken
27738 174.290305 host 1.44.0 USBHID 67
SET_REPORT Request
Frame 27738: 67 bytes on wire (536 bits), 67 bytes captured (536 bits) on
interface 0
USB URB
[Source: host]
[Destination: 1.44.0]
URB id: 0xffff964d9a2f8540
URB type: URB_SUBMIT ('S')
URB transfer type: URB_CONTROL (0x02)
Endpoint: 0x00, Direction: OUT
Device: 44
URB bus id: 1
Device setup request: relevant (0)
Data: present (0)
URB sec: 1515699253
URB usec: 785764
URB status: Operation now in progress (-EINPROGRESS) (-115)
URB length [bytes]: 3
Data length [bytes]: 3
[Response in: 27739]
Interval: 0
Start frame: 0
Copy of Transfer Flags: 0x00000000
Number of ISO descriptors: 0
[bInterfaceClass: HID (0x03)]
URB setup
bmRequestType: 0x21
bRequest: 9
wValue: 0x0315
wIndex: 0 (0x0000)
wLength: 3
Data Fragment: 150500
bRequest: SET_REPORT (0x09)
wValue: 0x0315
ReportID: 21
ReportType: Feature (3)
wIndex: 0
wLength: 3
66224 1042.041242 host 1.48.0 USBHID 67
SET_REPORT Request
Frame 66224: 67 bytes on wire (536 bits), 67 bytes captured (536 bits) on
interface 0
USB URB
[Source: host]
[Destination: 1.48.0]
URB id: 0xffff964c9246bd80
URB type: URB_SUBMIT ('S')
URB transfer type: URB_CONTROL (0x02)
Endpoint: 0x00, Direction: OUT
Device: 48
URB bus id: 1
Device setup request: relevant (0)
Data: present (0)
URB sec: 1515700121
URB usec: 536701
URB status: Operation now in progress (-EINPROGRESS) (-115)
URB length [bytes]: 3
Data length [bytes]: 3
[Response in: 66225]
Interval: 0
Start frame: 0
Copy of Transfer Flags: 0x00000000
Number of ISO descriptors: 0
[bInterfaceClass: HID (0x03)]
URB setup
bmRequestType: 0x21
bRequest: 9
wValue: 0x0315
wIndex: 0 (0x0000)
wLength: 3
Data Fragment: 153701
bRequest: SET_REPORT (0x09)
wValue: 0x0315
ReportID: 21
ReportType: Feature (3)
wIndex: 0
wLength: 3
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