The textual explanation in the manual is: "3GPP TS 27.005, Section 3.5.6 /3/. Controls the continuity of the SMS relay protocol link. If enabled (and supported by the network), several consecutive messages can be sent much faster as the link is kept open."
In http://doc.trolltech.com/qtopia4.2/modememulator-shortmessageservice.html, you can see: "AT+CMMS More Messages to Send The AT+CMMS command can be used to inform the modem that several SMS messages will be sent in quick succession, and the link should be held open for more efficient transmission." A more detailed description is in: http://www.18ic.com/htm/interface/2006-3/2/2006_03_02_1_4.html Where appear: "3.5.6 More Messages to Send +CMMS $(TEI R97)$ Parameter Command Syntax Command Possible response(s) +CMMS=[<n>] +CMMS? +CMMS: <n> +CMMS=? +CMMS: (list of supported <n>s) Description Set command controls the continuity of SMS relay protocol link. When feature is enabled (and supported by network) multiple messages can be sent much faster as link is kept open. Test command returns supported values as a compound value. Defined Values <n>: 0 disable 1 keep enabled until the time between the response of the latest message send command (+CMGS, +CMSS, etc.) and the next send command exceeds 1-5 seconds (the exact value is up to ME implementation), then ME shall close the link and TA switches <n> automatically back to 0 2 enable (if the time between the response of the latest message send command and the next send command exceeds 1-5 seconds (the exact value is up to ME implementation), ME shall close the link but TA shall not switch automatically back to <n>=0) Implementation Optional." How it really works is a matter of interpretation. Based in a second explanation in trolltech site, I assume command must be invoked before you send the first message send. But y saw examples using the command after each send operation. One of these is in: http://discussion.forum.nokia.com/forum/showthread.php?t=38201, where the use is AT+CMMS=2 to keep the connection after sending each message, but I think the usage is wrong. The third reference sounds much more technical to me, and think is the valid approach. Maybe I can modify your SendMesage.java program to test if with CMMS, the sending process is faster. In you case, maybe the usage before or after each message was not propper or your network does not support the CMMS and no benefit from them. That is all i know at the moment. If I have some new discovering, I will tell you. Pietro On Aug 22, 1:08 am, Thanasis <[email protected]> wrote: > You are correct. The CMMS command is supposed to keep the GSM link > open during message sending in order to speed up things (due to less > handshake per message). SMSLib used to use the CMMS command but it was > removed some versions ago. From personal experience, using Nokia and > Wavecom devices, I haven't seen any performance gain by using the CMMS > command. I don't know if my implementation was right or wrong, but I > didn't notice any speed improvements... > > If you want to add the CMMS command again, then the sendMessage() > method is the correct method to modify. This will not affect the > background sending though... > > A question from me: do you know the "scope" of the CMMS command? I > mean, once you issue CMMS=1 for how long or until what action is the > command in effect? > > On Aug 21, 5:29 am, Pietro <[email protected]> wrote: > > > I put the request, but investigated some more. You can write the > > message to phone and after send the fist time, can execute several AT > > +CMSS commands changing the destination number, but in a Nokia forum > > the experts says AT+CMMS=1 command is much better because the > > connection doesn't close waiting for the next message. > > > With that information, I saw the smslib 3.4.1 code to find where you > > send several messages at time. I found you do it in AGateway class, > > but because is generic gateway and the change only works in the > > subclass ModemGateway, I must override the method sendMessages in > > ModemGateway in order to put the AT+CMMS=1 if there are more than 1 > > output message pending, and set it to 0 before sending the last > > message. > > > Not all modems / networks support that command, and I must to use try- > > catch sequence. Am I correct?. I know 3.4.2 is the last stable > > version, but can't change it right now. > > > Thanks in advance > > > Pietro > > > On Aug 21, 12:59 am, Thanasis <[email protected]> wrote: > > > > Hello, > > > > > I can send the same message to some group of phones (1 by 1), or send > > > > to a group of phones (I think SMSlib support this feature directly), > > > > but my question is: what way goes faster?. Someone did some test?. > > > > As far as the speed, its the same thing. So pick the one that suits > > > your style :) > > > > > Can SMSserver support group sending? > > > > Not at the moment (I mean, not out of the box), but you can file your > > > enhancement request here:http://code.google.com/p/smslib/issues/list --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "SMSLib User Group" group. 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