Category: Geek

Qingping ClearGrass CGDK2 factory reset

The Qingping Temp & RH Monitor Lite is a cool little BLE device to monitor the temperature inside your home ,

If you are like me , you don’t really like the mihome app and want to use Home Assistant to automate your place.
Unlike the LYWSDCGQ/01ZM the CGDK2 encrypt the message broadcasted , so you can’t just add the device to home assistant and get readings, you need the encryption key or pairing key ,
The problem that I encountered to get that key is that you need to use a modified version of mihome , create a logs folder in the /vevs/ folder in your phone storage , and then, add the device to mihome for the key to be written in /vevs/logs/misc/pairings.txt
in my case , i added the device before creating the logs folder , so i didn’t have the pairing key .
I figured I just needed to delete and re-add the device to mi-home , but it didn’t go that way !
I tried and tried again and all I got was the error standard verification failed (-29).

Since I resolved this issue , I figured I share how i managed to re-add the Qingping Temp & RH Monitor Lite to mi-home .
I needed to do a factory reset on the device .
to do that you need to :
– Keep the pairing button pressed for 8 sec until all the segments of the lcd become black.
– Release the button for 1 sec ,
– Then push the pairing button again for 2 sec ,

The display flash then get back to displaying the temperature as usual, but now you device is factory reseted .
You can now add the device to mihome app and fetch the pairing key in /vevs/logs/misc/pairings.txt

now continue your configuration in home assistant using the Passive BLE Monitor integration

The NanoPI NEO Plus 2

the guys at Frendly elec Just created a very interesting board witch check a lots of mark in the things I look for in a SBC,

  • First : a good CPU
    the Allwinner H5 , is a powerful enough CPU that you might need to cool if you wish to use it at it’s full potential
  • Lots of RAM , 1GB DDR3
    the main issue i have with the OrangePI zero is that there is only 512 MB of ram in the biggest version. for a  lot of usages , it’s not enough.
    1GB should be plenty
  • integrated flash memory
    the problem with µSD card is that they degrade overtime , and after a year or two , you will see problem with you card unless you take special precaution to limit writes to the SD card.
    With eMMC the life of the memory should be longer.
  • Wifi b/g/n with a well supported chipset : the AP6212
  • Some GPIO’s
  • GIGABIT ethernet ,  a must have !

the price is 24.99$ at

Libre Computer Board a nice 4K capable SBC

Kickstarter spawned a very interesting board ,
it’s called Le Potato from the company Libre Computer Board

this board is designed to offer exactly the same layout as the RPI3 , but absolutely destroy it in term of performance

‘the powerful cpu and the large amount of ram enable usages forbidden by the low power of the RPI3.

  • A powerful web server
  • A NAS
  • A fast VPN gateway
  • A local media server
  • A torrent downloader
  • A media encoder
  • A IP camera storage server
  • Or a lightweight desktop computer


The cpu is a Quad 64-bit ARM Cortex-A53 CPU + ARM Mali-450 GPU it will need a active CPU cooling , which is provided in the 65$ option.

The specs given by the manufacturer are

HDMI 2.0
4 USB 2.0 Type A
RJ45 100Mb Fast Ethernet
Infrared Receiver
S/PDIF Header
UART Header
I2S + ADC Header
40 Pin Header for PWM, I2C, I2S, SPI, GPIO
eMMC Daughter Board Connector with the option for a 64GB emmc in the 99$ reward
MicroSD Card Slot with UHS Support


In some multiusers cases the 100 mbps ethernet port might limit the usage as a NAS. But in most cases, it should be fine as a NAS for 1 or 2 simultaneous users
But the hdmi 2 port is great if you think using it as a media machine connected to a TV for example
The lack of wifi connectivity is disappointing. And one of the 4 USB ports will be reserved for a Wi-Fi adapter
They justify this decision because of a lengthy certification process.
The maker plan on releasing a Wi-Fi + Bluetooth mezzanine in the future witch will address the lack of radio connectivity

Contourner les restrictions d’accès internet imposées par votre patron


Dans beaucoup de moyennes et de grandes entreprises les employeurs se préoccupent de plus en plus du temps passé sur internet par leurs employés. afin de minimiser la perte de temps de travail l’administrateur réseau . plusieurs solutions qui peuvent ètre :

  • Empécher les employés d’installer des programmes sur les ordinateurs avec des comptes d’utilisateurs restreins. Cela n’empèche pas d’accéder au net , mais cela limite l’installation de jeux vidéo et de programmes de messagerie instantanée.
  • l’utilisation d’un firewall ou d’un serveur proxy qui limite l’accés à internet , toutes les communications internet passent par un ordinateur , c’est donc l’emplacement idéal pour surveiller et restreindre l’accés a internet de tous les employés de la société. votre administrateur réseau peut facilement avoir la liste de tous les sites que vous avez consultés , lire vos mails etc…

  • installer un programme directement sur le poste de travail qui surveille les agissements de l’employé. (une technique peu fiable car il suffit de fermer le programme via le gestionnaire de tàches de windows)

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