print struct with field names:
fmt.Printf("%+v\n", myStruct)
foreach
for key := range myArray {
}
check if key is in map
if val, ok := myMap["key"]; ok {
}
All posts by danman
Black thursday
Hi all!
Yesterday I suffered a great loss. All my data from this server went away… Unfortunately, I didn’t have recent full-backup of my blog so I needed to recreate some posts from WayBackMachine. That’s why most of pictures in posts from 2016 and 2017 is missing. Sorry for that. If you are interested in some exact pictures contact me, I can try to find them in my files.
I wish you more luck with your backups.
Bye!
Multicast over “stupid” networks
IP multicast is an interesting technology. It’s main purpose is to
save network bandwidth as much as possible – traffic is sent to hosts
which asked for it only (as opposed to broadcast). On the other
hand, you need smarter (manageable) switches and specific
non-trivial configuration on both routers and switches. Even more
complicated it is when you try to make it work over VPN. Continue reading Multicast over “stupid” networks
Primitive webcam server using inetd and fswebcam
Hi all!
This weekend I was thinking how to make my webcam connected to
OrangePI send a picture “on demand”. There are daemons (e.g. motion or
webcam-mjpg) which do this but they capture images even when you are not
watching and I wanted to avoid this. There are also projects (fswebcam)
which are able to take single picture, save it to disk and end. I just
needed to run it after http request and send back the image. Installing
full webserver with some kind of interpreter (php, lua,…) seemed to me
like an overkill. So I came to an idea to use inetd.
And this is how I did.
Continue reading Primitive webcam server using inetd and fswebcam
Yet another IoT thermostat
Hi all,
this post will be about my homemade IoT thermostat. 
The goal was to not install any cables (because I live in a rented flat), to go really cheap and to be able to set the temperature from anywhere. I’ll also give you some tips you should think about when building your own. Let’s get started.
Example systemd unit config
/etc/systemd/system/my-service.service
[Unit] Description=My super service After=network.target [Service] ExecStart=/full/path #Type=forking #PIDFile= Restart=always RestartSec=2 User=root Group=root WorkingDirectory=/opt/service/ StandardOutput=syslog StandardError=syslog SyslogIdentifier=my-service Environment=PATH=/bin [Install] WantedBy=multi-user.target
systemctl daemon-reload systemctl enable my-service
OrangePi: Installing OpenELEC chroot into Armbian (Updated 15. Jul 2017)
Hi all,
since I found, that Debian chroot on OpenELEC is not the best solution, I tried to do it vice-versa. This is what I needed to do.
Continue reading OrangePi: Installing OpenELEC chroot into Armbian (Updated 15. Jul 2017)
OrangePi: Installing Debian chroot into OpenELEC
Hi all,
I have an OrangePi running jernej’s OpenELEC build connected to my TV. It works very well and stable, but on the other side, you can’t do much more with it because OE is very limited Linux distribution. This is a short guide how to run standard Debian services (nginx, samba, openvpn, … anything) in Debian chroot. Continue reading OrangePi: Installing Debian chroot into OpenELEC
Statistics of a typical Christmas fairy-tale from youtube
CarWatch: My homemade car tracking platform
Hi all,
few months ago, I was thinking about having my car tracked over GPS to make sure it is where I left it and to have some records how much I drive etc. There are commercial systems available for this but they cost some money and I wanted to have it customizable, under own control and to implement a few own ideas so I designed and implemented the system by myself. This is how CarWatch was born. Continue reading CarWatch: My homemade car tracking platform