On Thursday 07 August 2008 03:04:02 Robert William Hutton wrote: > Dan Weatherill wrote: > > If the phone is in standby, and I receive a text message, the phone > > wakes up but does not receive a text message. The person sending the > > message does, however, receive a delivery report. This occurs in both > > images as well. > > > > If I then subsequently receive a message after the others, whilst the > > phone is out of standby, I receive all the messages together. Hence, no > > messages are "lost" in the ether, but it seems that messages received > > whilst the phone is on standby are temporarily mislaid. > > This could be a possible explanation of what's going on: > > 1. The network attempts to send an SMS to your phone. > 2. The GSM chip receives notification from the network that there's an SMS. > 3. The GSM chip says to the network: wait, I'm temporarily unable to > receive (as the phone's asleep) and wakes up the system. > 4. The system comes up and waits. > 5. In the meantime the network has accepted that the SMS can't be sent, > and puts it into some kind of wait queue. > > It's up to the network what kind of exponential backoff algorithm they > use to decide when to resend. If the phone goes back to sleep before > the network attempts a resend, then the same events will occur at some > later time and the SMS will end up going back into the queue. Again and > again. > > On the Optus network, and from my experience with my old phone whose > inbox filled up all the time, the time between retries can become long > quite fast. When a subsequent SMS is sent, this always flushes the > retry queue as well, which is why you receive several messages at a time. > > Cheers, > > Rob.
Hi Rob (and everyone else), I did originally think this was what was happening, but It's definitely not the whole picture. For one thing, the sender receives a delivery receipt even though the text has not arrived. Ok, I hear you say, it could still be the case that the network sends a delivery receipt when the text has not arrived at the actual handset, but just the "queue". To test this, I intend to switch my freerunner on, have a message sent to it whilst it is in standby, and then plug it in and leave it on (not standby) for about six hours. I'll let you know how I get on. Dan _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
