Maximum number of fragments in the message IEI: Concatenated short messages, 8-bit reference numberĬoncatenated short message reference number This is what the “Concatenated short messages, 8-bit reference number” IE contains: offset And when sent to a phone the fragments were succesfully combined and the vCalendar event could be seen. We also received a second fragment with a similar UDH, where just the fragment number was 2 instead of 1. The SMSC added concatenation information when it fragmented our message, marked it as added by SMSC by adding the UDH Source Indicator and adjusted the length of the UDH accordingly.
Our original port addressing info and the actual data are the same. UDH Source Indicator (the following part is created by SMSC) My test setup Sample data from the AT Interface: ( My test hardware is from the early part of this Millennium…)
SENDING BINARY MESSAGES BACK INTIME SOFTWARE
For me, the easiest way to do this is to send the message again, but to a GSM or 3G modem connected to a computer running sms software that writes everything from the AT command interface to a log file. In such a situation you would want to get hold of the protocol data that was actually received. But checking the delivery status might show that the message was successfully delivered, it was just not shown, as the phone could not make sense of the data. When there is no sign of a message at the receiving end, you tend to assume that the message never left the sending system. But what if nothing had appeared in the phone? This actually happened more often than not while I was writing this artice. Those of you, who want to know, you know who you are.Īs the vCalendar event we sent as a binary message arrived at our handset and was displayed as a calendar event by the phone we know that everything worked.
WARNING! Most of you probably don’t need to understand what is going on here, so you can safely stop reading this article here. Lets dive deeper into the magical world of protocol dumps and bits and bytes within…
SENDING BINARY MESSAGES BACK INTIME HOW TO
In article Sending a binary message - Part 1 we learned how to send a MT binary message and also discovered that something fragmented the data without asking our permission.
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