Author Archives: danman

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 side, you need smarter (manageable) switches and separate and non-trivial configuration on both routers and switches. Even more complicated it is when you try to make it work over VPN. Continue reading

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

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.

Continue reading

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
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 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

CarWatch: My homemade car tracking platform

Hi all,cw-logo

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