In the meantime I've noticed some messages from the kernel:
ng_hci_process_command_complete: ubt0hci - HCI command failed, OGF=0x8,
OCF=0xb, status=0x12
I think it might be originating from here:
https://github.com/freebsd/freebsd-src/blob/d5677b0b8b8a1505edeaafab5606c4f890c1a42d/sys/netgraph/bluetooth/hci/ng_hci_cmds.c#L863C11-L863C17
But EINVAL has the value of dec22, and 0x12 points to EXDEV, which does
not seem related here. Also, this is not an errno, but a status code.
The same calls are succeeding with the example code at [1], and the
difference is, i'm using libbluetooth instead of manually implementing
the communication over the device. What might be causing this?
On 2024. 02. 08. 20:09, Gergely Czuczy wrote:
Hello,
I would like to ask for a bit of help. I'm absolutely not familiar
with bluetooth, and one of my components for my project is a bluetooth
LE device[1], and I'm having some troubles with the BT stack.
Initially I've based my code on the FreeBSD-BLE[2] examples, and my
stack worked. However, there was a power outage and the device
restarted, and this example stuff is still getting data, but my stack
is not anymore. What so far I have (and used to work but doesn't
anymore) is at [3].
I've tried reading through the manuals and docs, but it's absolutely
blurry. Like NG_HCI(4) tells me to do 3 things during HCI init
(Read_BD_ADDR, Read_Local_Supported_Features, Read_Buffer_Size) but
doesn't exactly tells me how. I'm using the bluetooth(4), and it's
told the bt_* calls return -1 on error, but how do I get the actual
error is nowhere explained. Especially for things like
NGM_HCI_NODE_GET_BDADDR, I don't know what the output data structure
to bt_devreq looks like, and how to get any error codes out, the call
like I do is not touching the output buffer.
Also, what I couldn't get done using the example code in [2] is to
make this work from userspace, even the example only returns data as
root.
I'm on FreeBSD 14.0-STABLE arm64 if it matters.
Could I please get some help on how to work with the BTLE stack properly?
Best regards,
Gergely
[1] https://kvurd.com/blog/tilt-hydrometer-ibeacon-data-format/
[2] https://github.com/takawata/FreeBSD-BLE/tree/master/le_enable
[3]
https://github.com/gczuczy/aegir/blob/fermd/controllers/fermd/Bluetooth.cc
