The WebShop for the SIMtrace hardware can be found here. We are using a CA-Cert signed SSL certificate and your browser vendor might not like it. Setting up, or mostly modifying the webshop was my first encounter with rails. In some ways it is a great framework, in others with a Smalltalk background there are some tears in my eyes. This is using spreecommerce because I wanted something that is not done in PHP and is not following the OpenCore…
In the last month and next couple of weeks we were/are developing a similiar application for Android, iPhone and the Desktop (using Qt and Quick) with native technologies. I will focus on Android and Qt as both are Open Source and we were developing them in a similiar fashion with one designer and one developer interacting with each other. In both cases the application has a couple of views mainly consisting of a ListView of some sort and I will…
I am very excited by the Qt Quick technology and I have finally found a reason to use it and gain some experience with it and want to report from my first hours of exploring it. The first time I have seen Declarative UI was with Enlightenment and the Edje framework. I liked it so much that I registered Epicenter five years ago. The plan was to create a handheld framework using declarative UI. Now Qt Quick is not just…
Hi, with some more debugging and fun with wireshark scripting and looking a pretty obvious issue has been resolved. Now GPRS for us is actually using IP, UDP, NS (some simple address and type of the messages), BSSGP (protocol between SGSN and BSS) and for actual data there is LLC at the end of the BSSGP. The LLC is part of the BSSGP payload as TLV (Tag, Length, Value). I created a simple setup that worked. It involved getting the…
I am now playing with the Android UI/Java Code and right now I have something really really simple to do. Over time I have a bunch of URIs to GET or POST and after it is done I want to have the status and the data. On top of that it should not block the UI thread. Android is using the HttpComponents of the apache project. The good thing about it is that Google was not reinventing the wheel, the…
Yesterday I had the pleasure of trying OpenBSC on a real network and the result was desaster, but honestly what else to expect when trying it the first time. It is not that OpenBSC was crashing, leaking memory, or not recovering from failure it is just the load of the network was differrent than what I assumed and that leads to problems. What happens is one is seeing a lot of location updating requests, which will load the SDCCH but…
I was invited to visit the On-Waves (they have a shiny new website) office in Paris this week and I was quite busy hacking away on the OpenBSC codebase. On-Waves allows me to play a bit with their MSC and learn more about GSM and in exchange OpenBSC gains a more and more complete and stable GSM A-Interface. When developing code for OpenBSC we are mostly sitting very close to the BTS, only have one active subscriber, test one thing,…
One thing that has bothered me while being at Openmoko is the lack of Security Response by the OpenEmbedded Crew. In one way a security issue is just like any other bug and distros don’t upgrade each package for each bug fixed upstream but it is getting worse when the security issues exists in the default installation, in a daemon listening to network traffic and such with ready to get exploits on the network. I think it is really unethically…
As this was requested in a comment of a previous post and knowing your kernel helps to write better performing systems here is a small information of how to use the interval timers provided by your posix kernel. What is the interval itime?r The interval timer is managed and provided by your kernel. Everytime the interval of the timer expires the kernel wil send a signal to your application. The kernel is providing three different interval timers for every application….
Something like 14 months ago I had no idea about GSM protocols, 12 months ago I was implementing paging for OpenBSC, beginning from last summer I explored SS7 and SCCP, wrote a simple SCCP stack for On-Waves. Started to implement the GSM A Interface for OpenBSC, the last week I saw myself learning more about MTP Level3. With the Osmocom I start to explore GSM Layer 1 (TDMA, bursts, syncing), GSM Layer 2 (LAPDm) and on GSM Layer3 we mostly…