Hello bluetooth developers,
We are developing a wheelchair that we can controle with a bluetooth
gamepad, the XBOX 360 controller to be more precise. It basically works
fine but when I remove the battery, I get the disconnect event in the
user space around 10 seconds later. That is not acceptable since the
wheelchair will keep rolling to potentially dangerous places!
I tried to implement a ping mechanism on the bluetooth layer, inspired
from bluez sources somewhere:
int _socket_fd = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP);
// bind on AF_BLUETOOTH
// connect with AF_BLUETOOTH
send_cmd->ident = PING_IDENT;
send_cmd->len = htobs(PING_DATA_SIZE);
send_cmd->code = L2CAP_ECHO_REQ;
if (send(_socket_fd, send_buffer, PING_PACKET_SIZE, 0) <= 0) {
// ...
}
It basically works fine except when the signal gets bad. This will get
printed by the kernel:
[ 859.629431] Bluetooth: hci0 link tx timeout
[ 859.635482] Bluetooth: hci0 killing stalled connection 9c:aa:1b:6b:51:c9
In that case, I don't get event from the /dev/jsX device but the gamepad
seems to still answer to pings??!!
Since I haven't found any acceptable workaround and always find the same
pages again and again, I'm asking here:
* Is it possible to achieve what I want?
* Does it make sense that the ping work but the HID layer seems dead?
* Any recommendation, pointers?
Best regards,
Guy
--
Guy Morand
Software Engineer
Scewo AG, Technoparkstrasse 2, 8406 Winterthur
www.scewo.ch
www.facebook.com/scewo
www.instagram.com/scewo_official
