Re: Patch: gw/smsc/smsc_smpp.c (Re: syncronize kannel with smsc)

[ how this tread lost mailing list headers? ]

On Tue, 2010-12-14 at 12:27, Alexander Malysh wrote:
> Hi,
> 
> it's a condition for every time based parameter that server synchronized to NTP.
> If this not a case it's not our bad.
> 
> I don't know reason for switching to absolute time anymore.
> 
> As to the bug: just imagine, you send message with validity of 1min, kannel try to deliver to SMSC but SMSC is not reachable for 2 min.
> Then SMSC is reachable again and kannel submits message to SMSC with validity of 1min BUT validity is already expired because we
> waited for 2 mins for SMSC.

I agree. As I wrote in one of previous post, absolute time is default
for SMPP. We don't know do all SMSC software implementations accept
relative times but for now we know that almost all accept absolute.
To find what is the status with this issue for all SMPP servers could
be tedious and error prone task.
 
> Thanks,
> Alexander Malysh
> 
> Am 13.12.2010 um 22:19 schrieb Nikos Balkanas:
> 
> > Hi,
> > 
> > I was not aware that you were in relative time before.
> > 
> > The only reason for switching is that it offers greater accuracy than absolute time. There is no guarantee that SMScs are correctly synchronized to NTP. Some users seem to objection to this. (or the UG entry). You obviously had your reasons for switching to absolute time. Could you list them or send me an email reference?
> > 
> > In kannel, in SMPP, the validity is correctly converted to calendar date before sending out. There is no bug, and the resolution in configuration is perefectly acceptable (seconds are an overkill).
> > 
> > BR,
> > Nikos
> > 
> > ----- Original Message ----- From: "Alexander Malysh" <[email protected]>
> > To: "Nikos Balkanas" <[email protected]>
> > Cc: "Milan P. Stanic" <[email protected]>; "ishagh ouldbah" <[email protected]>; <[email protected]>
> > Sent: Monday, December 13, 2010 7:29 PM
> > Subject: Re: Patch: gw/smsc/smsc_smpp.c (Re: syncronize kannel with smsc)
> > 
> > 
> > Hi,
> > 
> > I don't see why we have to switch to relative time again. Only bug in kannel is, that validity is in minutes and not
> > absolute time. The same bug apply to deferred.
> > 
> > Thanks,
> > Alexander Malysh
> > 
> > Am 27.11.2010 um 09:09 schrieb Nikos Balkanas:
> > 
> >> I stand corrected. bb sends in, at least in SMPP, absolute time as GMT + validity * 60 for validity and scheduled delivery time. Not very safe or good. Needs the server to be synchronized with SMSc, which would probably mean both have to be ntp synchronized.
> >> 
> >> This is a defect of the SMPP spec. It defines the format of relative time in absolute terms, instead of seconds, making it difficult to calculate and reconstruct.
> >> 
> >> The proposed patch makes smpp work with relative time. Please test, I do not have access to an SMSc. Let me know how it goes. I hope that all SMScs support it. It is more accurate than absolute time, since it doesn't require synchronization between smsc and bearerbox.
> >> 
> >> Please vote.
> >> 
> >> BR,
> >> Nikos
> >> ----- Original Message ----- From: "Milan P. Stanic" <[email protected]>
> >> To: <[email protected]>
> >> Sent: Monday, November 22, 2010 4:25 PM
> >> Subject: Re: syncronize kannel with smsc
> >> 
> >> 
> >>> On Mon, 2010-11-22 at 05:31, ishagh ouldbah wrote:
> >>>> are you sure?
> >>> 
> >>> According to SMPP version 3.4 time can be absolute or relative. Absolute
> >>> time is default.
> >>> How it is implemented in particular software is another question. I
> >>> think that the kannel uses absolute time, at least for SMPP.
> >>> 
> >>> Here is comment from gw/smsc/smsc_smpp.c
> >>> ---------------------------------------------------------
> >>> /*
> >>>   * check for validity and defered settings
> >>>   * were message value has higher priiority then smsc config group
> >>>   * value
> >>>   * Note: we always send in UTC and just define "Time Difference" as
> >>>   * 00 and
> >>>   *       direction '+'.
> >>>   */
> >>> 
> >>> ----------------------------------------------------------
> >>> 
> >>>> ________________________________
> >>>> From: Nikos Balkanas <[email protected]>
> >>>> To: ishagh ouldbah <[email protected]>; [email protected]
> >>>> Sent: Mon, November 22, 2010 1:00:48 PM
> >>>> Subject: Re: syncronize kannel with smsc
> >>>> 
> >>>> Well, UG is wrong there.  In the SMSc definitions it states:
> >>>> 
> >>>> validityperiod integer
> >>>> 
> >>>> How long the message will be valid, i.e., how long the SMSC will try try to send
> >>>> the message to the recipient. Defined in minutes.
> >>>> 
> >>>> BR,
> >>>> Nikos
> >>>> ----- Original Message ----- From: ishagh ouldbah
> >>>> To: Nikos Balkanas ; [email protected]
> >>>> Sent: Monday, November 22, 2010 1:31 PM
> >>>> Subject: Re: syncronize kannel with smsc
> >>>> 
> >>>> 
> >>>> thans for your reponce
> >>>> but in SMS Push (send-sms) CGI Variables it is writen in the userguid that to
> >>>> use
> >>>> the variable validity you should syncronize with smsc
> >>>> contant
> >>>> Optional. If given, Kannel will
> >>>> inform SMS Center that it should
> >>>> only try to send the message for
> >>>> this many minutes. If the
> >>>> destination mobile is off other
> >>>> situation that it cannot receive
> >>>> the sms, the smsc discards the
> >>>> message. Note: you must have
> >>>> your Kannel box time
> >>>> synchronized with the SMS
> >>>> Center.
> >>>> note that i need to specify it for a specified service
> >>>> regards
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> From: Nikos Balkanas <[email protected]>
> >>>> To: ishagh ouldbah <[email protected]>; [email protected]
> >>>> Sent: Sun, November 21, 2010 4:00:52 PM
> >>>> Subject: Re: syncronize kannel with smsc
> >>>> 
> >>>> Hi,
> >>>> 
> >>>> You don't need to. SMPP protocol works with validity period (relative time).
> >>>> Therefore, no absolute time is ever involved and you don't need to synchronize.
> >>>> 
> >>>> BR,
> >>>> Nikos
> >>>> ----- Original Message ----- From: ishagh ouldbah
> >>>> To: [email protected]
> >>>> Sent: Sunday, November 21, 2010 4:18 PM
> >>>> Subject: syncronize kannel with smsc
> >>>> 
> >>>> 
> >>>> Hi all,
> >>>> I want to set validity variable so I need to syncrnize with the smsc
> >>>> my question is
> >>>> How can I syncronize kannel box with smsc
> >>>> regards
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>> 
> >>> -- 
> >>> Kind regards,  Milan
> >>> --------------------------------------------------
> >>> Arvanta, IT Security        http://www.arvanta.net
> >>> Please do not send me e-mail containing HTML code.
> >> <smsc_smpp.diff>
> > 
> 

-- 
Kind regards,  Milan
--------------------------------------------------
Arvanta, IT Security        http://www.arvanta.net
Please do not send me e-mail containing HTML code.