Can I use this feature in a given web browser in a given version?

June 22, 2017

If you are developing for the web you certainly were confronted by the question if a given web feature (webrtcURLSearchParams, …) is supported by browsers and which versions of them. To answer this question you can use the website https://caniuse.com.

Check if port on remote server is open without using telnet

June 13, 2017

If you want to check if a given port is open on a given remote server, you can use telnet. More and more telnet disappears on server. So the question arises: What can we use instead of telnet? Short answer: netcat. For example:

nc -zv 192.168.1.15 22

Which checks if the port 22 (SSH) is open on the server 192.168.1.115

Android Studio on Linux 64bit: Emulator Timeout Problem

May 21, 2017

As a reminder for myself and maybe as a help for others: If you try to start the android emulator via Android Studio and the console tells you only this:

WARN – run.EmulatorConnectionListener – Timed out after 300seconds waiting for emulator to come online.

Then maybe you have fix your problem by removing the libstdc++.so.6 provided by the Android Studio so it uses the system one. For example:

~/Android/Sdk/emulator/lib64/libstdc++$ mv libstdc++.so.6 libstdc++.so.6.bak

Source: Stack Overflow: Cannot launch emulator on Linux (Ubuntu 15.10)

 

HP Elitebook 840 G4 and Linux Mint 18.1

April 10, 2017

(work in progress)

A friend of mine got a new notebook the HP Elitebook 840 G4 with Windows 10.  In this blogpost I want to document whats working and what not.

More detailed information about the hardware (lspci). You can also look at the the output of lspci -v

00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d11 (rev f1)
00:1c.3 PCI bridge: Intel Corporation Device 9d13 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Device 9d18 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (4) I219-V (rev 21)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
02:00.0 Network controller: Intel Corporation Device 24fd (rev 78)
03:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a804

Installation

I installed Linux Mint 18.1. The only non standard thing i had to do, was to shrink the Windows 10 partition with gnuparted. The installer had no option for that or I did not found it. Other than that, the installation went without a hitch and I was able to start both Windows 10 and Linux mint afterwards.

The kernel which is installed is linux-image-4.4.0-72-generic.

Configuration

As the display of the notebook has 2560×1440 pixel, the user interface was very small and difficult to use with both the mate and cinnamon flavor. Cinnamon has a configuration (Settings-General) where you can scale the interface for high dpi displays as that one. With the option “double” the cinnamon user interface is quite nice and usable.

  • Sound works out of the box
  • Special keys like dimming the display or muting work

Problems

Wifi

As of now, the wifi is not working. There seems to be drivers missing. Output of lshw

*-network UNCLAIMED
description: Network controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 78
width: 64 bits
clock: 33MHz
capabilities: cap_list
configuration: latency=0
resources: memory:d8a00000-d8a01fff

While lspci gives me

Network controller: Intel Corporation Device 24fd (rev 78)

Misc

  • The clock is changing in weird ways when booting into windows and linux.
  • Standby does not seem to work.

Comic: Days Off Versus More Pay

February 4, 2017
Days Off Versus More Pay

Days Off Versus More Pay

Comic: It’s not what it looks like

January 24, 2017
I swear to you - our bond was only emotional and physical, never contractual like what you and I have!

“I swear to you – our bond was only emotional and physical, never contractual like what you and I have!”

Comic: Eat Your Vegetables

January 19, 2017

1484841914-20170119

Looking for open source and privacy friendly android apps?

January 18, 2017

If you are interested in open source and privacy friendly android apps you should have a look at this two projects.

The group Privacy Friendly Apps are a collection of Android-Applications, which are optimized based on privacy. This means that only a minimum of permissions is used. There are no unnecessary permissions, e.g. a torch application would ask for a permission to read the contacts.

They provide apps like dicer, sudoko, weather and more. You can find a list of all their apps in the google playstore.

Simple Mobile Tools: A group of simple, stupid, open source Android apps with customizable widgets, without annoying ads and unnecessary permissions.

They develop camera, file-manager, gallery apps and more. You can find the apps on github/f-droid and play store.

Debugging scalability issues in action: Twitch Plays Pokémon

December 28, 2016

On Infoq.com you can wath a presentation about that:

John Rizzo introduces Twitch’s chat’s architecture, telling how their engineers investigated and worked through the issues in what turned out to be a make-or-break situation for the company.

 

Maven: Parent POM in repo, but Non-resolvable error

December 5, 2016

If you are using maven you may have been flabbergasted by an error like this

[ERROR] Non-resolvable parent POM: Failure to find at.test:test:pom:23 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced and 'parent.relativePath' points at wrong local POM @ line 9, column 10

I had this error and was wondering why it was occurring? I had the parent artifact in my local repository. It was not missing. Maven did know this, because the log said

[DEBUG] Verifying availability of /home/stefon/.repository/at/test/test/23/test-23.pom from [central (http://repo.maven.apache.org/maven2, releases)] 

So if I have the parent POM file in my repository and maven knows about it? Why are we getting an error?

As the file is not available on central, Maven will (correctly in my opinion) fail the build as the build would be non-reproducible.
(Mailarchive Maven-Users)

So, what do we do if it is not possible to publish our parent pom artifact?

there is a CLI option that you can enabled in Maven 3.1.1 that tells Maven “I know what I am doing and don’t make that check this time” i.e.  –legacy-local-repository

In other words:

 mvn clean install --legacy-local-repository

Just remember: This is a hack and may break at any moment with a new maven version! There is an blog article where you can find other solutions for your problem