Is there a way to check if Linux networking API's are ready or not using some command?
On Tuesday, May 3, 2016 at 4:05:01 PM UTC-4, William Hermans wrote: > > *Thank you very much. I will try to implement your suggested ways.* >> >> *Right now I am actually using service routine that executes the script >> that initializes the CAN. * >> *At the start of script I have given delay of 20 seconds.* >> > > > No problem. > > SO here is what I am guessing that happens. SocketCAN relies on the Linux > networking API's to work. So, it is my assumption that if networking on > your system is not ready at the time you're attempting to bring the CANBUS > interface up. It'll fail. What I say here is 100% correct, but I'm not > positive this is what is happening in your case. > > > Perhaps you could even write a script to help troubleshoot this problem. > But at this moment I'm not sure what would be a good thing to test for. The > output of lsmod might not be very helpful. > > On Tue, May 3, 2016 at 12:54 PM, Akash Gajeshwar <[email protected] > <javascript:>> wrote: > >> Thank you very much. I will try to implement your suggested ways. >> >> Right now I am actually using service routine that executes the script >> that initializes the CAN. >> At the start of script I have given delay of 20 seconds. >> >> On Tuesday, May 3, 2016 at 3:44:19 PM UTC-4, William Hermans wrote: >>> >>> Ok, so how do you fix the problem ? manually bring the CANBUS interface >>> up ? If that is te case, then you need to start your script later in the >>> boot process. Using rc.d may do the trick, but in case you're already using >>> rc.d, then you may need to setup a cron job to 30 seconds after boot, or >>> something. This would need trial and error. In other words this strongly >>> sounds like some kind of "race condition". >>> >>> With systemd there is a way to test for prerequisite services, but I do >>> not know systemd well enough to advise you there. >>> >>> On Tue, May 3, 2016 at 11:00 AM, Akash Gajeshwar <[email protected] >>> > wrote: >>> >>>> I have script that runs at startup which initializes the CAN >>>> communication on my BBB. Whenever I restart my BBB this script does work >>>> most of the times, I would say 7 out of 10. >>>> Once the CAN is up successfully it never stops in middle of working. >>>> Then I generally use Candump to fetch all the values from CAN bus. >>>> The only issue is, sometimes on reboot I get the error message saying >>>> "Read: Network is Down". So I am wondering what is the possible issue from >>>> BBB side. >>>> >>>> >>>> On Tuesday, May 3, 2016 at 1:20:01 PM UTC-4, William Hermans wrote: >>>>> >>>>> *Can you please tell me how does sometimes the CAN network goes down >>>>>> on rebooting the BBB?* >>>>>> >>>>> >>>>> No, I can only guess because you're not giving enough information. But >>>>> if I had to guess right now I'd say you're having a script / driver >>>>> module >>>>> race condition. But even that does not sound 100% right. >>>>> >>>>> You need to apply some troubleshooting for situation . . . >>>>> >>>>> On Tue, May 3, 2016 at 10:14 AM, Akash Gajeshwar < >>>>> [email protected]> wrote: >>>>> >>>>>> Yes. I do have a script that runs at startup. >>>>>> >>>>>> Even if I try to run that script manually it shows the same error. >>>>>> >>>>>> Can you please tell me how does sometimes the CAN network goes down >>>>>> on rebooting the BBB? >>>>>> >>>>>> On Tuesday, May 3, 2016 at 12:58:11 PM UTC-4, William Hermans wrote: >>>>>>> >>>>>>> Of course the can network goes down when you reboot the system, but >>>>>>> you need to be more clear as to what your problem is. Do you have a >>>>>>> script >>>>>>> that runs on startup that is failing, or what ? >>>>>>> >>>>>>> On Tue, May 3, 2016 at 9:48 AM, Akash Gajeshwar < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Hello, >>>>>>>> >>>>>>>> I am using "Waveshare CAN Cape" for sending CAN messages from >>>>>>>> Beaglebone Black. I communicate with Beaglebone using ethernet by >>>>>>>> making >>>>>>>> SSH connection and I have latest Debian OS on BBB. >>>>>>>> >>>>>>>> Sometimes when I restart the Beaglebone it shows an error message >>>>>>>> saying "Network is down". Because of this my whole CAN communication >>>>>>>> stops >>>>>>>> to work. >>>>>>>> >>>>>>>> I am not sure why there is this inconsistency with BBB. Please let >>>>>>>> me know if there is any possible solution for this. >>>>>>>> >>>>>>>> Thank you, >>>>>>>> Akash G. >>>>>>>> >>>>>>>> -- >>>>>>>> For more options, visit http://beagleboard.org/discuss >>>>>>>> --- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "BeagleBoard" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to [email protected]. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/beagleboard/c8d019d5-7ec7-4b5d-93a2-4bf56af84d98%40googlegroups.com >>>>>>>> >>>>>>>> <https://groups.google.com/d/msgid/beagleboard/c8d019d5-7ec7-4b5d-93a2-4bf56af84d98%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> >>>>>>> -- >>>>>> For more options, visit http://beagleboard.org/discuss >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "BeagleBoard" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/beagleboard/31638628-584e-4c16-8a6e-dc18c361723e%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/beagleboard/31638628-584e-4c16-8a6e-dc18c361723e%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "BeagleBoard" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/beagleboard/1c30c10f-9326-47bf-a9a3-2a8d5ea1a074%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/beagleboard/1c30c10f-9326-47bf-a9a3-2a8d5ea1a074%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/9035344e-1c2d-4917-a4ef-b1a2cd89c450%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/9035344e-1c2d-4917-a4ef-b1a2cd89c450%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/32bd028b-33ad-4bd4-a0de-25ba68566316%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
