Why FLARM protects it’s radio protocol

The FLARM device is definitely useful for avoiding collision in sailplane.

But the company behind maintains it’s monopoly position arguing that’s it’s safer and cheaper for the users:

We fundamentally believe that our low cost collision warning technology and its licensing procedures are in the
best interests of the sport and its participants.

To ensure safety, full compatibility and interoperability are essential. Experience shows that it is impossible to
be compatible just by following a written specification.


This text is just regular company’s crap, to reassure themselves (and the shareholders) they can maintain a high level of monopoly (and profit).

They also state the radio protocol is patented:

FLARM applies for the radio communication between the units a proprietary and copyright-protected protocol

Unfortunately, there is no such thing as copyrighted radio protocol!

My prefered part is it when the founder respond this accusation of being obscure and avoid implementation in many hardware device, and in software such as XCSoar:


The best part it: they managed to impose the device, not only in competition but for any sailplane in France. How comes the FFVV (French Gliding Federation) can make a device mandatory without any alternative?

One person, Hiram Yaeger seemed to have reverse engineered the protocol:



If interoperability by documentation or standardization would not be possible, even in RF, there would be no GSM, no GPRS, no WIFI, no Bluetooth.

What do you thing you are FLARM? You are just making a simple electronic device broadcasting GPS position in the free RF band, and it’s not even EASA / CAA / FAA certified! (just like any regular babyphone)

Step down while you can and publish this RF protocol, or the community will do it for you sooner or later! (and no update of the 10k units released in the world will save you)

Service en ligne La Banque Postale: client mécontent

Voici un mail envoyé aux services en ligne de La Banque Postale dont je suis très mécontent.

Bonjour, je suis client à la Banque Postale, aussi bien à titre
personnel que pour mon entreprise.

Je vous écris car je suis TOUT SIMPLEMENT LAS de votre service, digne de
l'URSS, souvent non fonctionnel, toujours minimaliste, pas intuitif pour
un sou.

- Par exemple, l'ajout de compte bancaire pour virement prend toujours
48h alors qu'il devrait être instantanée. (sinon on serai encore au
- Votre système d’identification est tout simplement laborieux, limité à
des chiffres.
- Je ne peux pas accéder a mes compte pro ET perso simultanément car
vous utilisez le même cookie. (alors que ce besoin est fréquent dans une
petite entreprise).
- si je ne me déconnecte pas de l'interface pro, et que je vais sur la
page perso, je me prend un message d'erreur de login, c'est pas mon
- des bannière pub pour vos services annexes qui clignotent au dessus de
MES comptes, alors que je PAYE mon compte.
- Sur les relevés, vous offrez les FRANCS, WTF? Mais ou est ma collonne
Ancien Francs!
- les virements sont limités à 3000€, vous croyez qu'une entreprise joue
aux billes? Ça fait sérieux de payer un fournisseur avec 4 virements....
- le temps que j'écrive ce message, l'identification a déjà timouté,
oui, je passe plus de 5min sur mes comptes et je n'y accède pas d'un
cybercafé en Somalie.

J'ai déjà ouvert un compte bancaire pro au Crédit Mutuel et je vous
informe que je vais faire de même pour mon compte perso.

On est en 2014, il serait temps d’être à la page, avec des service
disponible en anglais par exemple non?

A bon entendeur (si il y a quelqu'un dans votre entreprise colossale,
assez AGILE pour faire remonter ce message)

Un Entrepreneur, créateur, innovateur!
Notez que cela concerne uniquement les services en ligne, car au niveau service physique, hormis la carte bancaire, je n’en utilise aucun donc je ne peux pas m’en plaindre.



Smartphone headset standards: 2013 and still not one standard!

Believe it or not but are still two headset standards (headphone + microphone) for cellphone: TRRS_Standards

  • OMTP: old Nokia (and also Lumia starting from the 2nd gen[15]), old Samsung, old Sony Ericsson (2010 and 2011 Xperia’s), old Wiko (2012-)
  • CTI: Apple, HTC, latest Nokia, latest Samsung, latest Sony (2012+), latest Wiko (2013+), most Android phones

Root, recovery et flash: Wiko Stairway

Obtenir les droits root depuis une simple application: Framaroot.

Recovery boot depuis Linux: CWM.

Installer une Rom depuis Windows, c’est ici.

Bon à savoir, le Wiko Stairway, n’est autre que le Micromax A210 Canvas 4 / Blu Life One rebrandé….

Skytraxx 2.0 interferences VHF radio

I’m facing this problem: I have a Skytraxx 2.0 (GPS variometer for paraglider) and a Puxing PX-888 VHF ham radio.
When the variometer emits sounds, it triggers the radio whatever the squelch setting is set on.
A quick video of the problem:

While I’m doubtful about the CE certification of this very cheap Chinese radio (a CE sticker is present in the battery tray but doesn’t mean much…).

So, as I’m not planning to change neither the radio or the variometer, I came along with this fix: put aluminum foil inside the variometer case.

Very easy to do, juste make sure the aluminium touches the usb connector when you close it and everything else is well insulated (pin with kapton tape, etc..).

Now the same test with the aluminium shield:

Much better: can use for competitions now, with the mini solar vario leBipBip.

It even seems to improve the time to fix, usualy took 5min and now about 1-2min.


Mon timbre en ligne

Voici  une planche de timbre spécimen, qui n’est accéssible qu’en créant un compte.

Ca aurait été mieux de pouvoir l’avoir directement dans la FAQ pour vérifier avant meme de s’inscrire.



Thunderbird: remove unused english dictionary

Having 5 unused English dictionary is annoying (I only need one, not en_NZ, en_US, en_AU and en_ZA)

First remove dictionary:

sudo /usr/lib/thunderbird/dictionaries.back/
sudo mv /usr/lib/thunderbird/dictionaries/* /usr/lib/thunderbird/dictionaries.back/

and prevent them from being reinstall the next update:

sudo dpkg-divert --add /usr/lib/thunderbird/dictionaries

then place only the wanted dictionary:

sudo mv  /usr/lib/thunderbird/dictionaries.back/en_GB.aff /usr/lib/thunderbird/dictionaries/en.aff
sudo mv  /usr/lib/thunderbird/dictionaries.back/en_GB.dic /usr/lib/thunderbird/dictionaries/en.dic

And restart Thunderbird.

Contact synchronisation: Android/Zimbra/Thunderbird

I do use the following combination :

  • Thunderbird (Linux or Windows)
  • Android (without any Gmail/google account)
  • Zimbra mail server

And to get my address book synchronised, I installed the following softwares:

Thunderbird: Zindus

Android: CardDAV-Sync and Contact Editor Pro (make sure to install the last one to be able to edit contacts)

And use Zimbra and in Address Book tab, right click on Contacts and select Share address book:

And copy the URL bellow:

Then use this URL to set your configuration in Zindus:

and add a CardDAV account with the URL and you mail/password

and voilà, you have the 3 places synchronised on the go!

Ubuntu: talking clock every hours

Since I work at home, time is running so fast I can really keep track of it.

So I found a convenient way to get spoken hours every hours of working time, during working week.

First, the software:

sudo apt-get install gnome-schedule festival alsa-oss

Then test from console:

echo "current time is `date +\%-1H` oclock" | aoss festival --tts

You can customize the spoken text, change %-1H with %-1L if you want 24 or 12AM/PM format.

The %-1 is to remove the leading zero (nine oclock in the morning would be 09 otherwise)

Lastly, it’s time for a cron job from Gnome-Schedule:

Command line is:

echo "current time is `date +\%-1H` oclock" | aoss festival --tts >/dev/null 2>&1

(dont forget to backslah the % character with \)

With this settings, it speaks from 8 to 22, only from Mon to We