Hi,
About a month ago I posted on the Subsurface group
(https://groups.google.com/g/subsurface-divelog/c/35cwOUrPxw4) about problems
connecting to my Scubapro G2 from an Apple Silicon (M2) MacBook Pro running
Sonoma. It works perfectly on my old Intel Macbook Pro running Catalina.
Several people said they had similar problems, but no one said anything about
working connection. I also contacted ScubaPro and asked if they had it
working with LogTraks and they weren’t much help.
Both BT dev and QT are new to me, and I’m not a Mac developer, but I
was very curious as to why Subsurface sees my G2 on my old Intel Mac and not my
new M2. (yes, I know about curiosity and the cat...) I found the QT
lowenergyscanner example and sure enough, it shows the G2 when I run it on the
M2. I compared it to btdeviceselectiondialog.cpp and the difference seems to
be the call to QBluetoothDeviceDiscoveryAgent::start(). Subsurface uses
start() while lowenergyscanner uses
start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod) and after changing it in
Subsurface, my G2 shows up when scanning. I'm really not sure of the
implications of this find, but I'm pretty sure something bad would happen if
this change was simply made. Maybe it could be tied to the "force LE'
checkbox?
Continuing down this path, I made the same change in btdiscovery.cpp.
Again, this is not a suggested code change, but simply data gathering at this
point. With that change, I get as far as the point where INFO:
qt_ble_open({...}) is logged and then it crashes. I should mention that the
binary was built on my old Intel Mac and then copied over to the M2 (more about
that later). Oddly enough (to me at least), the crash reporter was not
invoked. I ran it using lldb and the output is:
INFO: connected to the controller for device
{a8f5364d-eabf-b24a-2f6c-79ccb49b7424}
Process 19648 stopped
* thread #23, queue = 'com.apple.bluetooth.iobluetooth.coordinatorQueue', stop
reason = EXC_BAD_ACCESS (code=1, address=0x400000000000012)
frame #0: 0x000000010aa1bf51 QtBluetooth`-[OSXBTConnectionMonitor
connectionNotification:withDevice:] + 161
QtBluetooth`-[OSXBTConnectionMonitor connectionNotification:withDevice:]:
-> 0x10aa1bf51 <+161>: callq *0x10(%rax)
0x10aa1bf54 <+164>: leaq -0x20(%rbp), %rdi
0x10aa1bf58 <+168>: callq 0x10a9fbab0 ;
QBluetoothAddress::~QBluetoothAddress()
0x10aa1bf5d <+173>: leaq -0x28(%rbp), %rdi
It’s probably worth mentioning at this point that it was build using a brew
installed QT 5.15.7. Hoping to get more, useful, information I tried
building Subsurface on the M2. First I tried using an offline installer
version of QT Qt5.12.12 (I couldn’t find a installer for 5.15). This wouldn’t
build so I installed brew QT 5.15.13_1 and was able to build. When I tried
running it I get:
Exception Type: EXC_BAD_ACCESS (SIGKILL (Code Signature Invalid))
Exception Codes: UNKNOWN_0x32 at 0x0000000102f2c000
Exception Codes: 0x0000000000000032, 0x0000000102f2c000
but, I found that it does run under lldb. With lldb it actually connected to
the G2, but it fails with:
INFO: Found service {fdcdeaaa-295d-470e-bf15-04217b7aa0a0} Unknown Service
INFO: c: {a188b7dd-debb-449a-852d-c243d46b4b1a}
INFO: c: {aa0c68f0-ea9c-493d-8112-62879e72af68}
INFO: d: {00002902-0000-1000-8000-00805f9b34fb}
INFO: Using service {fdcdeaaa-295d-470e-bf15-04217b7aa0a0} as preferred service
INFO: .. enabling notifications
INFO: Using read characteristic {aa0c68f0-ea9c-493d-8112-62879e72af68}
INFO: now writing "0x0100" to the descriptor
{00002902-0000-1000-8000-00805f9b34fb}
INFO: Bluetooth: Failed to enable notifications for characteristic
{aa0c68f0-ea9c-493d-8112-62879e72af68}
ERROR: Bluetooth: Failed to enable notifications.
At this point I’m well and truly in over my head...
Questions:
1. Is a can of worms that should be opened?
2. Is there anything obviouly wrong with using a brew installed version
of QT?
3. Is trying to build and debug on the M2 a waste of time given that
the distribution version of Subsurface is for the Intel architecture?
thanks for any suggestions,
jim
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