On Sat, 1 Sep 2012, Marek [iso-8859-2] Floria�k wrote: > Hi everyone, > > I have two identical devices on usb (they are connected to bus 5 and bus 3 and > they have different serial numbers of course). Devices are CKOZ-00/03 - > Xcomfort gateway for controling house electric system. Both of them work fine > when connected together and when I'm sending commands to them one by one. > Problem appears when I send two commands (one after another in loop) to both > devices, which in turn are sending data to remote actuator which in turn > should reply with some data. In short words it looks like my computer is > loosing one reply from remote device. ... > So my questions are: > When I'm sniffing data like this, is it still possible that kernel, or module, > or whatever is loosing data that I'm waiting for, and If so, how can I produce > more detailed debug. It's possible that data is getting lost, but it's pretty unlikely. The only way to get more detailed debugging information is to use a USB bus analyzer. (It also wouldn't hurt to upgrade to a more recent kernel. 2.6.32 is getting kind of old.) > Or is it actually a proof that CKOZ devices connected to my computer are not > getting data from remote actuator in the first place? You could do more testing. For example, run the same program but comment out the parts that talk to the device on bus 3. Or plug the devices into each other's ports, or swap the serial numbers in the program. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
