I'm currently working on a new exciting open-source project which is taking up the wast majority of my time. Once official I'll hopefully get back to somewhat of my normal life and start posting more again, for now follow me on twitter.
If you are or know someone who may be interested in contributing with code or design please contact me directly at jpetersson [ at ] garnser dot se.
Monday, August 31, 2009
Tuesday, August 11, 2009
Flow control routing
Just this morning I stumbled upon an article about Lawrence G. Roberts work on flow-control routers. I'm a bit surprised that I haven't stumbled upon his work earlier given that he's been in the market with this since 1999.
The technology behind flow-control is well described in the following chart:
If you're interested I would give the article about it a read, it's quite impressive that we've been able to keep up the last few years with 40 year old technology, I'm sincerely hoping to see more of these solutions in the future, especially if someone would decide to implement it into the Linux kernel.
The technology behind flow-control is well described in the following chart:
If you're interested I would give the article about it a read, it's quite impressive that we've been able to keep up the last few years with 40 year old technology, I'm sincerely hoping to see more of these solutions in the future, especially if someone would decide to implement it into the Linux kernel.
Wednesday, July 29, 2009
MySQL.com down
As some of you may have read we recently had an outage with MySQL.com we're now back up and in better shape. Due to this I'm now back in Sweden for a couple of weeks hacking a bit, hopefully I'll be able to post some fancy diagrams here at some point around it.
Wednesday, July 15, 2009
Going private
Given that the nature of this blog has become quite technical I've decided to break out a portion of it that has more of a personal touch to it. I'll try to post updates more frequently on this blog with things going on in my life and my thoughts on various decisions. This blog will stay around but I'll limit it to technical information/solutions only for now.
You can follow the new blog at me.garnser.se
You can follow the new blog at me.garnser.se
Tuesday, July 14, 2009
SMS-proxies
Communicating over the Atlantic in an easy and cheap way has always been a hassle, surely products like Skype/IM has helped with this a lot but it's still not a perfect solution given that there's some restrictions.
I've recently gotten myself into the situation where I want people in Sweden to be able to send me SMS from Sweden not paying more than their usual local rate and have their messages end up on my phone with no extra charge.
I'm sure that if anyway at AT&T sees this they're going to get furious about it but hey, hackers will always be around doing stuff like this, adopt to the new technology instead.
Either way, starting to look into this problem I was thinking about a couple of SMS projects I've done a couple of years back, unfortunately all of these were payed services meaning that if I were to receive any message the sender would pay a minimum of 5 SEK ($0.5) which kinda kills the idea of the project. After poking around with colleagues someone gave me a tip about Ballou that has SMS services.
So I registred and looked around in the FAQ to figure out how to get things working, I expected there to be an option to have a prefix in an SMS followed by the message which would be sent to a 5-digit number or similar but I got a nice surprise, upon request you'll be assigned a dedicated number for no extra cost.
Obviously I would meet some more issues around this, Ballou does have an email forwarding service so I figured I should try sending it to AT&T's mail-to-SMS service, unfortunately it turned out that Ballou included a lot more information than I needed for this setup. When receiving an email it is formatted like:
2009-07-13 18:57:36
Från +467066XXXXX
Till +4673012XXXXXX
Text:
Message
And yeah that's HTML being sent as well. I could probably see myself making use of this extra data in another project but for this the only thing I wanted to have was the actual message, given the restricted amount of people I am giving this number to I would be able to figure out who it is anyway, so this is kinda where my project took of.
As I've posted about before I'm using the Google Enterprise services including email for my domains, I had somewhat of a naive hope that they would support some kind of macros when forwarding emails but unfortunately this wasn't the case.
Given the situation I decided to look into alternative ways to get the essential information to my mobile, what came to mind was a quick Perl hack.
This script is quite simple but yet powerful, essentially what it does is:
Oh and btw Ballou, please honor newlines and don't run s/\n//g on my messages, it's putting words together and it's honestly pretty damn annoying.
I've recently gotten myself into the situation where I want people in Sweden to be able to send me SMS from Sweden not paying more than their usual local rate and have their messages end up on my phone with no extra charge.
I'm sure that if anyway at AT&T sees this they're going to get furious about it but hey, hackers will always be around doing stuff like this, adopt to the new technology instead.
Either way, starting to look into this problem I was thinking about a couple of SMS projects I've done a couple of years back, unfortunately all of these were payed services meaning that if I were to receive any message the sender would pay a minimum of 5 SEK ($0.5) which kinda kills the idea of the project. After poking around with colleagues someone gave me a tip about Ballou that has SMS services.
So I registred and looked around in the FAQ to figure out how to get things working, I expected there to be an option to have a prefix in an SMS followed by the message which would be sent to a 5-digit number or similar but I got a nice surprise, upon request you'll be assigned a dedicated number for no extra cost.
Obviously I would meet some more issues around this, Ballou does have an email forwarding service so I figured I should try sending it to AT&T's mail-to-SMS service, unfortunately it turned out that Ballou included a lot more information than I needed for this setup. When receiving an email it is formatted like:
2009-07-13 18:57:36
Från +467066XXXXX
Till +4673012XXXXXX
Text:
Message
And yeah that's HTML being sent as well. I could probably see myself making use of this extra data in another project but for this the only thing I wanted to have was the actual message, given the restricted amount of people I am giving this number to I would be able to figure out who it is anyway, so this is kinda where my project took of.
As I've posted about before I'm using the Google Enterprise services including email for my domains, I had somewhat of a naive hope that they would support some kind of macros when forwarding emails but unfortunately this wasn't the case.
Given the situation I decided to look into alternative ways to get the essential information to my mobile, what came to mind was a quick Perl hack.
This script is quite simple but yet powerful, essentially what it does is:
- Look for any unread message from Ballou notifying me that a new SMS has been delivered.
- Download the given email.
- Parse the email for the actual message.
- Mail to AT&T's mail-to-SMS service.
Oh and btw Ballou, please honor newlines and don't run s/\n//g on my messages, it's putting words together and it's honestly pretty damn annoying.
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