How to write a filter for a Kensington Orbit trackball about bthidhub HOT 10 OPEN

You don't need to figure out those details, actually. And the existing mouse filter is not actually a general filter, it fails with most devices I've personally used.

Can you try out the process of updating the sdp_record.xml as described at: #31 (comment)

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Also: #11 (comment)

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Thanks @Dreamsorcerer ! So per your suggestion , I swapped the big long hex number in sdp_record.xml to the one in the report description for my trackball. I think I only have one report id and so I assume there's nothing else to change? (btw, i only want to use a mouse; no keyboard necessary).

The result feels somewhat like progress in that x/y movement is sort of coming through to the host if I use "default" filter, but the moment jumps around all over the place. It's definitely not usable .

So next I will try to get hid-tools running on the host (Windows) as well and if I succeed i'll post the two outputs here. But, if the SDP record is the same and bthidhub is just forwarding the data through to the host, i don't understand where the problem could be.

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ok, i'm struggling to work out how to run hid-tools or similar on Windows. Any tips?

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I've just realised that @ruundii changed the mouse filter code. So my other comment about the mouse filter should be to change the filter code to just:

    def filter_message_to_host(self, msg):
        return b'\xa1\x03' + msg

But, sdp_record.xml was also changed, so not sure if there are other changes needed. I still don't have anything running to retest with the new code.

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ok, i'm struggling to work out how to run hid-tools or similar on Windows. Any tips?

No. I don't use Windows and am only familiar with hid-tools in so far as I have run it to see the output from my own devices. Sorry.

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Download an Ubuntu disk and just boot Ubuntu off a USB drive? You can just test it from there without installing anything on your machine.

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Good idea re: usb drive ubuntu.

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Per @Dreamsorcerer 's excellent suggestion i ran hid-tools from an Ubuntu USB drive.

The difference between the HID events from the mouse directly versus via bthidhub is somewhat illuminating.

Direct:

# ReportID: 1 / Button: 0  0  0  0  0 | # | X:     0 | Y:     0 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.000000 8 01 00 00 00 00 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:     0 | Y:    -3 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.159625 8 01 00 00 d0 ff 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:     0 | Y:    -1 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.163695 8 01 00 00 f0 ff 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:     0 | Y:    -2 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.175529 8 01 00 00 e0 ff 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:     0 | Y:    -4 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.179489 8 01 00 00 c0 ff 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:    -2 | Y:    -9 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.191567 8 01 00 fe 7f ff 00 00 00
# ReportID: 1 / Button: 0  0  0  0  0 | # | X:    -6 | Y:   -12 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.195507 8 01 00 fa 4f ff 00 00 00

Via bthidhub:

# ReportID: 1 / Button: 1  0  0  0  0 | # | X:   256 | Y:   256 
#             | Wheel:    0 | AC Pan:    0 | 0x10168:    0 
E: 000000.000000 9 01 01 00 01 10 00 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:     0 | Y:  -256 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.028618 9 01 01 00 00 f0 ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X: -1536 | Y:  2047 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.079712 9 01 01 00 fa 7f ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:  -256 | Y:  -257 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.109602 9 01 01 00 ff ef ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:  -512 | Y:  -769 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.149613 9 01 01 00 fe cf ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:  -256 | Y:  -257 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.201166 9 01 01 00 ff ef ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:  -256 | Y:  -257 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.231032 9 01 01 00 ff ef ff 00 00 00
# ReportID: 1 / Button: 1  0  0  0  0 | # | X:     0 | Y:  -256 
#             | Wheel:   -1 | AC Pan:    0 | 0x10168:    0 
E: 000001.268584 9 01 01 00 00 f0 ff 00 00 00

Now i'm no computer scientist, but via bthidhub the x and y coordinates seem to be multiples of 256, which I think must mean that the x and y bytes are 8-bits out of alignment .

So how do I fix that?

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So, I see in the first one:
E: 000000.163695 8 01 00 00 f0 ff 00 00 00
And, in the second one:
E: 000001.028618 9 01 01 00 00 f0 ff 00 00 00

Appears there is an extra 0x01 being added. Have you updated the mouse filter code as I mentioned? Maybe try printing out the msg going through that function to confirm exactly what is happening.

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