on IRC:
<lizardo> dack: it would be nice if you could provide a sample C code that shows the issue you described on the mailing list
<lizardo> specially the arguments you are using for bind/connect/setsockopt/listen/* (I'm assuming you are using sockets directly)
<dack> lizardo: unfortunately my code is a mess of C mixed with Python. yeah, I could provide the argument details
HCI sockets
-----------
socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI)
bind(device_id) // I get device_id's from udev
hci_le_set_scan_parameters(fd, 0, 0x10, 0x10, 0, 0, 1000) // bluez method in the shared library
setsockopt(SOL_HCI, HCI_FILTER, hci_filter) // I set the filter to let everything through (for testing)
hci_le_set_scan_enable(fd, 1, 0, 1000) // bluez method in the shared library to turn on scanning
// I shut blocking off on the socket
// I then use epoll to wait for events
L2CAP sockets
-------------
socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP)
bind(bdaddr, 0) // bind to bluetooth address and PSM 0 (Python doesn't support LE directly,
// but this is enough for binding to the right device
// shut blocking off
// next part I do in C because of the lack of support in Python...
PySocketSockObject *sock; // the socket I created in Python
char *bdaddr;
int cid = 0;
int psm = 0;
int bdaddr_type = BDADDR_LE_PUBLIC;
int err;
struct sockaddr_l2 addr;
// code here to set &bdaddr, &cid, &psm, &bdaddr_type
// from arguments passed from Python or they're
// left to their defaults
memset(&addr, 0, sizeof(addr));
addr.l2_family = sock->sock_family;
str2ba(bdaddr, &addr.l2_bdaddr);
if (cid)
addr.l2_cid = htobs(cid);
else
addr.l2_psm = htobs(psm);
addr.l2_bdaddr_type = bdaddr_type;
err = connect(sock->sock_fd, (struct sockaddr *) &addr, sizeof(addr));
// lastly use epoll to wait for events
I then set CCC values on some attributes to get notifications of changes to sensor readings
Results
-------
On my x86 tests: everything works fine, notifications come down the proper L2CAP sockets
on my ARM tests: all notifications come down whatever L2CAP socket was established last
I just realized I missed some fundamental details in the previous emails...
bluez 4.101
linux kernel 3.4.43 compiled with ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf on Allwinner A10 chipset
tried on various armhf chipsets with the same results using kernel 3.0.X--
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