USB mouse and Magic Trackpad 1 not working about bthidhub HOT 7 OPEN

If it's listed as paired host, and you're connected to the laptop, then there should definitely be something in hid-recorder on the host. Admittedly, I've only tried on a Linux machine myself. This suggests that the host will not receive anything from the hub (or maybe you just forgot to connect the hub in BT settings?)...

The 2 things we are working with is the big long number in sdp_record.xml and the corresponding number after R: in the hid-tools output. Basically, you need to copy the latter number (removing the spaces and ignoring the first number, so starting from 0501) into the number in sdp_record.xml.
I really need to see the hid-tools output to figure out where (and I have 0 paired hosts to test it myself right now...). But, the output would show what part is currently mapped to a mouse (it would be somewhat similar to your other output, so we'd probably be looking a section starting with 0902). That section of the number would be removed and replaced with the other one.

As your device already has multiple report IDs, you'd also need an additional change to the mouse filter code. I think your filter code would just end up as a single line:
return b'\xa1' + msg

Hopefully, if @ruundii comes back around to fix up some things, then we can look at making this whole process completely automatic (#23).

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If I were to take a guess from the info above, I'd say remove:
05010902a1010901a100850305091901290815002501950875018102950081030600ff0940950275081581257f8102050109381581257f750895018106093009311601f826ff07750c95028106c0
And at exactly the same place, add:
05010902a10185020509190129021500250195027501810295017506810305010901a1001581257f09300931750895028106c00506092085471500256475089501b1a20602ff09558555150026ff0075089540b1a2851315002501750195010601ff090a81020601ff090c8122750195068101c0

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If that doesn't work, it'll be pretty much impossible to debug without comparing hid-tools output on the host..

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Thank you for your response! You've given me some direction to dig in and debug further.

It seems like macOS treats HID devices a bit differently than hid-tools expects. I'll try to find the Report ID for the track pad on my macOS host a different way.

I'll attempt to update the sdp_record.xml as you suggested and will report back.

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I tried replacing the string recommended. While it didn't exactly work, I'm now seeing Bluetooth packets that resemble the track pad events on the macOS host:

I hadn't previously seen these packets until I changed the string in the sdp_record.xml and restarted my Pi. I'm capturing these packets on the macOS host using the PacketLogger.app found in Additional Tools for XCode.

Here's an example of me pressing Command + Tab on the keyboard paired with the hub and captured on the macOS host:

The image above shows four packets that represent, in order:

0. Pressing Command
1. Pressing Tab
2. Releasing Tab
3. Releasing Command

And here's the first captured packet from me scrolling on the track pad:

I'm still not sure why the keyboard works but the track pad doesn't but this is promising! Tomorrow I'll try to capture the packets when the connection is made between the hub and host. I hope this will tell something about how macOS is registering the Bluetooth device.

Thank you again for pointing me in a direction!

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Last update for the day:

I changed the Report Filter for the track pad from Mouse to Default. That resulted in the captured packets appearing like so:

The three red/brown/orange(?) packets are from when I attempted to three-finger scroll. The rest of the packets appear to be recognized as a different type of packet that matches the working keyboard packets. Unfortunately, the keyboard does not work anymore.

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Yes, stick to the modified Mouse filter. When you run hid-recorder on the Pi, it will show events from the mouse. Do the events look similar to the ones you are sniffing on the host? If so, compare some events (like a mouse click) and check exactly what the differences are.

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