a new Music Service for SONOS: xenim streaming network

I am a frequent podcast live-stream listener. And being that I am enjoying the awesome service called xenim streaming network.

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Any Podcast producer can join the xsn and with that can live-stream his own Podcast while recording. It’s CDN is based on voluntarily provided resources and pretty rock-solid as far as my experience with it goes.

Since I am a frequent user of this – and I’ve got that gorgeous SONOS hardware scattered around my house – I thought I need to have that service integrated into my SONOS set.

The SONOS system knows the concept of “Music Services”. There are quite a lot of them but xsn is missing. But SONOS is awesome and they got an API!

Unfortunately the API documentation is hidden behind a NDA wall so that would be a no-go. What’s not hidden is what the SONOS controllers have to discuss with all the existing services. Most of the time these do not use HTTPS so we’re free to listen to the chatters. I did just that and was able, for the sake of interoperability, to reverse engineer the SONOS SMAPI as far as it is necessary to make my little xsn Music Service work.

As usual you can get the source-code distributed freely through Github. If you’re not into that sort of compiling and programming things, you are invited to use my free-of-charge provided service. To set it up on your home SONOS just follow these simple steps:

Step 1: Start your SONOS Controller Application and find out the IP address of your SONOS.

Click on “About My Sonos System” and check the IP address written next to the “Associated ZP”.

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Step 2: Add the xsn Music Service.

By opening a browser window and browsing to: http://<your-associated-zp-ip>:1400/customsd.htm

When you’re there – fill out the fields as below. The SID is either 255, or if you used that previously, something between 240-253. The service name is “xenim streaming network”. The Endpoint URL and Secure Endpoint URL both are http://xsn.schrankmonster.de/xsn

Set the Polling interval to 30 seconds. Click on the Anonymous Authentication SOAP header policy and you’re good to go. Click on “send” to finish.

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Step 3: Add the new Music Service to your SONOS Controller.

Click on “Add Music Services” and click through until you see “xenim streaming network”. Add the service and you’re set!

p.s.: It’s normal that the service icon is a question mark.

Step 4: Enjoy Live Podcasts!

Source 1: https://github.com/bietiekay/sonos-xsn-service
Source 2: http://streams.xenim.org/

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How-To Set-Up your own Miataru server

Since a user of miataru asked about how to set-up your own miataru server I’ve decided to make a short screen recording of how you can do it with the help of Nitrous.IO:

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When your VU+ DUO just shows a red light and does not start up

So it happened to one of the VU+ Duos in the house. After a clean shutdown it did not boot up as expected but instead just showed the red light. It still blinked on remote keypresses and the harddisk spun up. Nothing else happened with it.

So it was bricked.

Reading the forums about that pointed to a capacitor on the board that quite regularly seems to fail. C807 is it’s name and it’s located near the Harddisk and the power-supply part of the VU+ Duo.

When I looked at the capacitor it did not seem to be faulty or anything. So without the right tools to measure I’ve decided to just give it a shot and replace the original 16V 220uF 85 degrees celsius capacitor with a 105 degrees celsius 16V 330uF one.

In my case I’ve taken out the board, to have a little bit of extra space, and cut of the old capacitor. Desoldering would be nicer looking but, well …

Replacing it on the left-over pins of the old capacitor was a matter of seconds.

After putting the board back in, the VU+ Duo powered up and booted as new. Brilliant!

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Debugging Linux: Latency heatmaps

“Odd patterns of I/O latency can be hidden by line graphs and summary statistics, and revealed by histograms and heat maps. In my previous post I showed my Linux iosnoop tool, which can trace block device I/O along with timestamps and latency. This information can be visualized, revealing any odd patterns.”

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Source: http://www.brendangregg.com/blog/2014-07-23/linux-iosnoop-latency-heat-maps.html

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Do you need an alternative shell for your terminal?

“Commands have been a big part of computing ever since the 1970′s.  Their power comes from their simplicity.  Just type a word or two to do what you want.  The time has come to bring this power together with the usability and convenience of modern interfaces.”

“Xiki is open and flexible.  It’s open source, and brings together tools, languages, shells, and text editors, rather than competing with them.  Open formats and languages are the best thing for the tech ecosystem.  HTML and JSON made the web what it is today.  And the web arguably made everything else. 

Xiki strives to be the simplest possible way (and ways) to create interactive interfaces.  This means a text in and text out interface.  Since everything is text, almost nothing is against the rules when you’re creating an interface in Xiki.  Xiki stands for “expanding wiki”, and is inspired by the wiki philosophy of fully editable text, with simple syntaxes (like “>” for a heading, and “-” for a bullet).  Xiki extends wiki ideas to user interface in general.”

Source: https://www.kickstarter.com/projects/xiki/xiki-the-command-revolution

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Knight Rider: a conclusion

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“Knight Rider ist wieder da! Nach Jahren des bangen Wartens zeigt RTL endlich wieder den jungen David Hasselhoff, der mit seinem “Wunderauto” auf große Verbrecherjagd geht. Knight Rider war Kult, Knight Rider ist Kult, und Knight Rider mit Bier ist Oberkult! Angeklebte Armaturen, deren Knöpfe beinahe beliebig in Farbe, Beschriftung und Anordnung variieren, während der Fahrt wechselnde Lenkräder, Stuntfahrer mit krasskranken Clownsfrisuren sowie viele, viele, WIRKLICH viele Logik-, Dreh-, oder sonstwie geartete Fehler laden zur spaßig alkoholgetränkten Analyse ein. Die dümmsten Drehpannen, die peinlichsten Hasselhoff-Anmachen, die unauffälligsten Tarnsack-Autofahrer.”

 

Source: http://www.regelt.org/knightrider/sprittforfun/knightrider.html

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Next step: Holodeck.

“The Infinadeck is the world’s first affordable omnidirectional treadmill that is designed to work both in augmented and virtual reality.  This revolutionary device provides the missing link making it now possible to have a true Holodeck experience. You might say, “Reality just got bigger”.”

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Source: http://www.infinadeck.com/

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Nitrous – full IDE in your browser – with Collaboration!

“Nitrous is a backend development platform which helps software developers save time by cutting out the repetitive parts of creating development environments and automating them.

Once you create your first development environment, there are many features which will make development easier.”

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So what you’re getting is:

  • a virtual machine operated for you and set-up with a single click
  • A full-featured IDE in your browser
  • Code-Collaboration by inviting others to edit your project
  • a debugging environment in which you can test-run and work with your code

Here are some screenshots to get you a feel for it:

Source: https://www.nitrous.io/

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Scaling Linux: Perfomance Tools and Measurements

 

If you ever experienced a missmatch between the performance you expected from a server or application running on Linux you probably started to debug your way into it why the applications performance is not on the expected levels.

With Linux being very mature you get an enormous amounts of helpers and interfaces to debug the performance aspects of the operating system and the applications.

Want to see proof? Here – a map of almost all the thingies and interfaces you got:linuxperftools

Thankfully Brendan Gregg put together a page with videos and further links to drill into those interfaces and methods above.

Source: http://www.brendangregg.com/linuxperf.html

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How to get a list of all recent Podcasts on SONOS

I am using an external podcast download tool to stay updated on all podcasts I subscribed to. For this purpose SubSonic is a good choice – actually for a lot more also.

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One of the quirks of the SONOS products is that Podcasts are not really well supported. In fact there is no support at all.

So I wrote a tool that extends the SONOS players with the functionality to “remember” play positions within audiobooks and podcasts. Now what’s left to properly have podcasts supported is a view of the most recently updated podcasts. Wouldn’t it be nice to have a “Folder View” in the SONOS controller of what’s new across all the different podcasts you are subscribed to?

Now here’s the trick:

Use a small script on any RaspberryPi in the house to dynamically create hardlinks to the podcasts files in a “Recently Updated Podcasts” folder.

The script is something like this:

find /where-your-podcasts-are/ -type f -printf ‘%TY-%Tm-%Td %TT %p\n’ | sort | tail -n 25 | cut -c 32- | sed -e “s/^/ln \”/” -e “s/$/\”/” -e “s/$/ \”\/recentPodcasts\/\”/” | sh

This short line will go through all folders and subfolders in /where-your-podcasts-are/ and then create Hardlinks in /recentPodcasts to the most recent 25 files.

That way, and when /recentPodcasts/ is made accessible to your SONOS controllers, you’ll have something like this:

Screen Shot 2014-07-02 at 19.17.24

Source 1: http://www.subsonic.org
Source 2: play position bookmarker

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Boblight Alternative: Hyperion

After setting up Boblight on two TVs in the house – one with 50 and one with 100 LEDs – I’ve used it for the last 5 months on a daily basis almost.

First of all now every screen that does not come with “added color-context” on the wall seems off. It feels like something is missing. Second of all it has made watching movies in a dark room much more enjoyable.

The only concerning factor of the past months was that the RaspberryPi does not come with a lot of computational horse-power and thus it has been operating at it’s limits all the time. With 95-99% CPU usage there’s not a lot of headroom for unexpected bitrate spikes and what-have-you.

So from time to time the Pis where struggling. With 10% CPU usage for the 50 LEDs and 19% CPU usage for the 100 LEDs set-up there was just not enough CPU power for some movies or TV streams in Full-HD.

Hyperion

So since even overclocking only slightly improved the problem of Boblight using up the precious CPU cycles for a fancy light-show I started looking around for alternatives.

“Hyperion is an opensource ‘AmbiLight’ implementation controlled using the RaspBerry Pi running Raspbmc. The main features of Hyperion are:

  • Low CPU load. For a led string of 50 leds the CPU usage will typically be below 1.5% on a non-overclocked Pi.
  • Json interface which allows easy integration into scripts.
  • A command line utility allows easy testing and configuration of the color transforms (Transformation settings are not preserved over a restart at the moment…).
  • Priority channels are not coupled to a specific led data provider which means that a provider can post led data and leave without the need to maintain a connection to Hyperion. This is ideal for a remote application (like our Android app).
  • HyperCon. A tool which helps generate a Hyperion configuration file.
  • XBMC-checker which checks the playing status of XBMC and decides whether or not to capture the screen.
  • Black border detector.
  • A scriptable effect engine.
  • Generic software architecture to support new devices and new algorithms easily.

More information can be found on the wiki or the Hyperion topic on the Raspbmc forum.”

Especially the Low CPU load did raise interest in my side.

Setting Hyperion up is easy if you just follow the very straight-forward Installation Guide. On Raspbmc the set-up took me 2 minutes at most.

If you got everything set-up on the Pi you need to generate a configuration file. It’s a nice JSON formatted config file that you do not need to create on your own – Hyperion has a nice configuration tool. Hypercon:

Screen Shot 2014-06-28 at 08.52.51

So after 2 more minutes the whole thing was set-up and running. Another 15 minutes of tweaking here and there and Hyperion replaced Boblight entirely.

What have I found so far?

  1. Hyperions network interfaces are much more controllable than those from Boblight. You can use remote clients like on iPhone / Android to set colors and/or patterns.
  2. It’s got effects for screen-saving / mood-lighting!
  3. It really just uses a lot less CPU resources. Instead of 19% CPU usage for 100 LEDs it’s down to 3-4%. That’s what I call a major improvement
  4. The processing filters that you can add really add value. Smoothing everything so that you do not get bright flashed when content flashes on-screen is easy to do and really helps with the experience.

All in all Hyperion is a recommended replacement for boblight. I would not want to switch back.

Source 1: Setting up Boblight
Source 2: https://github.com/tvdzwan/hyperion/wiki/Installation

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APN Changer for iOS – when you’re abroad and in need of different mobile provider settings

When traveling you might find yourself in the situation that you get a new SIM card into your iPhone and it’ll start and do it’s automatic magic for you. And eventually you well end up with the right provider settings by default.

But there are some cases when it picks the wrong provider settings. Like in my case. It picked NTT docomo in Japan with the default NTT docomo settings. In my case I was using a reseller for NTT (as described here) and that demanded different provider settings to work.

Unfortunately in all it’s wisdom the iPhone did not allow me to set the carrier settings. It just displayed the “Automatic” choice. So I went to the APN Changer website, entered the settings and installed a custom provider setting to my device. This works without any Jailbreak with iPhones without SIM Lock.

Source: m.apnchanger.org

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using the RaspberryPi to make all SONOS speakers support Apple Airplay

Airplay allows you to conveniently play music and videos over the air from your iOS or Mac OS X devices on remote speakers.

Since we just recently “migrated” almost all audio equipment in the house to SONOS multi-room audio we were missing a bit the convenience of just pushing a button on the iPad or iPhones to stream audio from those devices inside the household.

To retrofit the Airplay functionality there are two options I know of:

1: Get Airplay compatible hardware and connect it to a SONOS Input.

airportexpress_2012_back-285111You have to get Airplay hardware (like the Airport Express/Extreme,…) and attach it physically to one of the inputs of your SONOS Set-Up.  Typically you will need a SONOS Play:5 which has an analog input jack.

PLAY5_back

2: Set-Up a RaspberryPi with NodeJS + AirSonos as a software-only solution

You will need a stock RaspberryPi online in your home network. Of course this can run on virtually any other device or hardware that can run NodeJS. For the Pi setting it up is a fairly straight-forward process:

You start with a vanilla Raspbian Image. Update everything with:

sudo apt-get update

sudo apt-get upgrade

Then install NodeJS according to this short tutorial. To set-up the AirSonos software you will need to install additional avahi software. Especially this was needed for my install:

sudo apt-get install git-all libavahi-compat-libdnssd-dev

You then need to get the AirSonos software:

sudo npm install airsonos -g

After some minutes of wait time and hard work by the Pi you will be able to start AirSonos.

sudo airsonos

And it’ll come up with an enumeration of all active rooms.

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And on all your devices it’ll show up like this:

IMG_1046

and

Screen Shot 2014-06-25 at 12.38.27

 

Source: https://github.com/stephen/airsonos

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How to use the Tokyo public transportation system as a visitor

Being in Tokyo as a visitor brings a lot of challenges. Since you gotta use the public transport offers to get from A to B. Now we had the same challenge this May and this is how we tried to solve it.

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Problem: How do you know which train lines you take and where they are?

Solution: Use Google Maps (you need mobile internet access!) to find your route

The public transportation feature of Google Maps works like a charm. It’s accurate as it can be and offers even walking instructions to get to the right platform or train station.

Notice the colored lines next to the different stations. That’s the color you’re looking for on the train. They are color coded! To find your right platform just take the information that Google gives you and look out for it. It will be written on signs “Rinkai towards Tokyo Teleport”.

 

Problem: Okay I know which train I have to use. But before I enter the platform I have to pass the ticket gate. How do I buy a ticket? How do I know which one?

Solution: Get a Suica card and charge it! If you’re a group travelling: Look out for cheap group ticket offerings.

A Suica card (aka “Super Urban Intelligent Card”) can be used instead of buying a ticket. You can buy it where you can buy the tickets – most of the time it’s 500 Yen + charge. Charging it with some Yen is crucical since the gates will not let you in when your card is not at least charged with 210 Yen.

You may ask: If I buy a ticket from A to B I have to pay the price upfront. When I use the Suica how does it work then? Easy answer: When you enter the train station through the ticket gate you pass it with your Suica card. It will start a journey for you. When you exit it will end the journey. The card and system is intelligent enough to calculate all steps in between, add them up and substract the fare price from your Suica balance. It always takes the cheapest price for single travellers.

If you’re on your way as a group you might want to use the ticket machines before going through the ticket gates. The Suica is a personal card and only suited for one person to be used. So you cannot pass it through the ticket gate back and enter the ticket gate again without causing panic with the service personell.

To buy tickets for groups I suggest to switch the terminals to english – most of them will offer that option. You then have to specifically know where you want to go. Sometimes it’s the easiest way to just go to the counter and buy them there.

Sometimes when you bought tickets you find out that you made a mistake. Fear not! You can give them back and by doing so get your money back. Service personell is awesome and will help you at any time! DO NOT PANIC!

Another awesome feature you get ‘for free’ by having a Suica card is that you can use it with all the vending machines available everywhere in the train stations. Just pick the beverage you want and swipe the card. Done!

Beware: fill the card up before going out of the ticket gate when you used it all up!

If you happen to have a NFC enabled device (like most Android phones) you can install the Suica Reader app from the Google Store and get information about what happened to your card so far.

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how to get mobile Internet (3G / LTE) in Japan

If you visit Japan the next time and you want to get perfectly good Internet access while there on your mobile phone I can recommend the b-mobile offer. On my last stay in Japan (May 2014) I tried their service for the first time and I was not let down.

They give you two options: The 1 GB prepaid option gives you 1 GB as fast as possible. The 14days prepaid gives you 14 days of limited speed coverage (300kbps).

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I went for the 14 days prepaid option knowing that I might get some usage depending on where I go. The 300kbps where faster than I thought – at no given time I experienced any speed problems. The coverage was awesome since it just dialed into NTT Docoms 3G/LTE network.

For just under € 30 this is an awesome option for any traveller. Even better: You can pick it up at the Airport or you can have it delivered to your hotel! We tried both and it worked both as expected. Fast delivery, perfect service!

Source: http://www.bmobile.ne.jp/english/product.html

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Need to do Load Tests? Try Tsung!

Tsung is an open-source multi-protocol distributed load testing tool

It can be used to stress HTTP, WebDAV, SOAP, PostgreSQL, MySQL, LDAP and Jabber/XMPP servers. Tsung is a free software released under the GPLv2 license.

The purpose of Tsung is to simulate users in order to test the scalability and performance of IP based client/server applications. You can use it to do load and stress testing of your servers. Many protocols have been implemented and tested, and it can be easily extended.

It can be distributed on several client machines and is able to simulate hundreds of thousands of virtual users concurrently (or even millions if you have enough hardware …).

Source 1: http://tsung.erlang-projects.org/

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did you know that the marriage rate in Ohio correlates with legal executions? Spurious Correlations!

I took notice of a website called “Spurious Correlations“. It seems that it collects all sorts of correlating statistics to proof the point of how important context is to statistics. Enjoy!

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Source 1: http://www.tylervigen.com/

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new Webcams of Bamberg – even a panoramic one!

We’re living near a very nice city called Bamberg. And after a long time there are new Webcams availabel for anyone to look at. Even a 360 degree panoramic view!

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Source 1: https://www.stadt.bamberg.de/
Source 2: http://www.bnv-bamberg.de/index.php/hotline/71-die-neuen-webcams

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Tokyo Trip ahead

Tokyo

Stay tuned here for at least some coverage of this years Japan trip.

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MOSH (Mobile Shell) – fixing SSH for everyone

How many times did you experience a connection loss on your terminal window in the last week? Yeah I know – like everytime you close the lid of your notebook and move to a different place. So like a dozen times every day.

And everytime you reconnect to your servers and you use things like screen to keep your terminals open and your programs running while you’re disconnected.

On the other hand – did you ever curse the internet gods while you tried to do a very important check or bugfix to a machine whilst on a train or mobile roaming network? It’s not what I would call fun-times. When there are no constant disconnects the lag is just infuriating. MOSH also solves this since it’s predicting and responding way faster then vanilla SSH. Your terminal becomes useable again!

So there’s now MOSH to the rescue:

Remote terminal application that allows roaming, supports intermittent connectivity, and provides intelligent local echo and line editing of user keystrokes.
Mosh is a replacement for SSH. It’s more robust and responsive, especially over Wi-Fi, cellular, and long-distance links.
Mosh is free software, available for GNU/Linux, FreeBSD, Solaris, Mac OS X, and Android.

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Install it on your servers and your clients and never lose a connection again.

Source 1: http://www.gnu.org/software/screen/
Source 2: http://mosh.mit.edu

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TIME_WAIT – how does it work?

The Problem Addressed by the TIME-WAIT State

The Problem Addressed by the TIME-WAIT State

The purpose of TIME-WAIT is to prevent delayed packets from one connection being accepted by a later connection. Concurrent connections are isolated by other mechanisms, primarily by addresses, ports, and sequence numbers

Source: http://www.isi.edu/touch/pubs/infocomm99/infocomm99-web/

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when javascript equality checks, always use ===

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Source: http://dorey.github.io/JavaScript-Equality-Table/

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IPv6 native root server has problems with OpenFire Jabber / XMPP Server to Server

I was setting up a new root-server machine and went for the Debian 7 minimal set-up. Thankfully the root-server provider I am using (hetzner) is connected with IPv4 and IPv6 natively. Awesome stuff!

If you’re using an IPv6 native set-up these days you STILL have to be cautious about possible side-effects with software having bugs and not knowing how to deal with these ginormous ip adresses.

So there’s a well known Jabber / XMPP server that I am using for some years now without any issues. I was even using it on native IPv6 connected machines earlier.

But with the fresh and clean set-up of Debian 7 and IPv6 by the hoster several problems started bubbling up.

1: the ‘there can only be one ipv*’ problem

Turns out that the debian team decided to set a system setting by default that lets IPv6 aware applications bind to IPv6 only. Good thing, you can disable it by adding this to your sysctl.conf:

net.ipv6.bindv6only=0

2: the ‘who resolves first is right’ problem

When you get a IPv6 native machine it might have a resolv.conf consisting of IPv4 and IPv6 name servers. And don’t worry: Everything is going to be all-right as long as the software you’re planning to use is perfectly capably dealing with the answers of both types of servers. The IPv4 ones will default to the A records, the IPv6 ones to the AAAA record.

Now there’s OpenFire. A stable and easy to use XMPP / Jabber server implementation. It’s based upon Java and I am running it with Java 7 on my Debian machine.

Unfortunately in the current 3.9.1 version of OpenFire there’s a bug that leads to Server-to-Server XMPP connections not working when they resolv to IPv6. So for example your Google-Talk contacts won’t work at all.

The bug itself is rather stupid: Seems that OpenFire expects an IPv4 adress from the DNS lookup and crashes on an IPv6 adress.

The solution is as easy as the bug is stupid: Remove the IPv6 defaulting nameservers from your resolv.conf.

# nameserver config
nameserver 2xx.xxx.yyy.99
nameserver 2xx.xxx.yyy.100
nameserver 2xx.xxx.yyy.98
nameserver 8.8.8.8
nameserver 8.8.4.4
#nameserver 2axx:yyy:0:zzzz::add:9898
#nameserver 2axx:yyy:0:zzzz::add:9999
#nameserver 2axx:yyy:0:zzzz::add:1010

Source 1: defaulting to net.ipv6.bindv6only=1
Source 2: http://community.igniterealtime.org/thread/51902

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Find out how words translate in europe

“Enter one or two lower-case English words to see translations from Google Translate.”

 

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The Data Visualisation Catalogue

The Data Visualisation Catalogue is currently an on-going project developed by Severino Ribecca.

Originally, this project was a way for me to develop my own knowledge of data visualisation and create a reference tool for me to use in the future for my own work. However, I thought it would also be useful tool to not only other designers, but also anyone in a field that requires the use of data visualisation regularly (economists, scientists, statisticians etc).

Although there have been a few attempts in the past to catalogue some of the established data visualisation methods, there is no website that is really comprehensive, detailed or helps you decide the right method for your needs.

I will be adding in new visualisation methods, bit-by-bit, as I research each method to find the best way to explain how it works and what it is best suited for.”

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Source 1: http://datavizcatalogue.com/

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