Send email from your Raspberry Pi 3

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Simple SMTP is a simple MTA (Mail Transport Agent) to deliver mail from a computer to a mail hub (SMTP server). It can be usefull to send result of your Cron jobs.

Install ssmtp:

sudo apt-get install ssmtp

Configure it:

sudo nano /etc/ssmtp/ssmtp.conf

# Config file for sSMTP sendmail
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.

# The place where the mail goes. The actual machine name is required no
# MX records are consulted. Commonly mailhosts are named

# Where will the mail seem to come from?

# The full hostname

# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address

Configure the account sending the email:

sudo nano /etc/ssmtp/revaliases

# sSMTP aliases
# Format:       local_account:outgoing_address:mailhub
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.

Try to send an email:

echo "email for test" | ssmtp -vvv

If you use Gmail you might need to allow less secure apps:

Timer + screen on Raspbian

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Sometimes, you wanna try some risky things such as playing with Network on your Raspberry through SSH. If you lose the connection, and you are not next to the Raspberry, you lose it for good. Sad but true :(


A timer to restart Raspberry just in case shit happens while playing dumb through ssh:

sudo nano /home/pi/
for (( c=$1; c>1; c-- ))
   echo -n "Reboot in $c minute(s)...  "
   date +%H:%M
   sleep 1m
echo "Reboot in 1 minute(s)..."
sleep 1s
for (( c=59; c>0; c-- ))
   echo -e "\e[101mReboot in $c second(s)... (CTRL+C to cancel rebooting)\e[49m"
   sleep 1s
echo -e "\e[101mReboot in $c second(s)...\e[49m"
echo -e "\e[101mREBOOT!!!\e[49m"
sudo reboot


This needs to be started in a screen. If not, you lose the SSH link, and the timer script is stopped (meaning no restart of Raspberry...).

Here are some screen tips.

  1. Start a shell command in a screen :
    $ screen bash /home/pi/ number_of_minutes
  2. To resume your screen session use the following command :
    $ screen -r
  3. In case you have multiple screen sessions running on you machine you will need to append the screen session ID after the r switch. To find the session ID list the current running screen sessions with:
    $ screen -ls
    There is a screen on:
            14704.pts-1.raspberrypi (21/12/18 15:15:26)     (Attached)
    1 Socket in /run/screen/S-pi.
    $ screen -r 10835


Subsonic on Raspberry Pi 3

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Install java:

sudo apt-get install openjdk-8-jre

Download the Subsonic .deb package and install it:

sudo dpkg -i subsonic-x.x.deb

Change user (i have set pi instead of root) :

sudo nano /etc/default/subsonic

For troubleshooting interesting files are here: /var/subsonic

It was interesting because it allowed me to understand why Subsonic web interface was OK but impossible to play a file :

cat /var/subsonic/subsonic.log
[2018-01-14 10:59:44,539] INFO TranscodeInputStream - Starting transcoder: /var/subsonic/transcode/ffmpeg -i /home/pi/Music/Paul Kalkbrenner - Berlin Calling/07_Paul_Kalkbrenner_-_Torted_Original Mix.mp3 -map 0:0 -b:a 128k -v 0 -f mp3 -
[2018-01-14 10:59:44,551] INFO InputStreamReaderThread - (/var/subsonic/transcode/ffmpeg) /var/subsonic/transcode/ffmpeg: 1: /var/subsonic/transcode/ffmpeg: Syntax error: "(" unexpected

It was a problem linked with ffmpeg. I think the problem comes from the fact that ffmpeg given in deb is made for ubuntu/debian but probably not ARM processor. THis is why I install ffmpeg from repository and then linked Subsonic folder to this ffmpeg freshly installed:

sudo apt-get install ffmpeg
sudo rm /var/subsonic/transcode/ffmpeg
sudo ln -s /usr/bin/ffmpeg /var/subsonic/transcode/ffmpeg

Restart Subsonic:

sudo service subsonic restart

Configure Subsonic using web interface and admin account.

It worked! I could play my music from Astana, Kazakhstan while it was actually stocked in my Raspberry in Paris!

In my opinion it works quiet nice! Not laggy I mean.

Samba on Raspberry Pi 3

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Install samba:

sudo apt-get install samba

Edit configuration file:

sudo nano /etc/samba/smb.conf
# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
interfaces = wlan0
bind interfaces only = yes
comment = Samba sharing on Raspberry Pi
path = /home/pi/Downloads
writable = yes
guest ok = yes
guest only = yes
create mode = 0777
directory mode = 0777
share modes = yes

Let everyone read and write on /home/pi/Downloads:

sudo chmod -R 777 /home/pi/Downloads

Restart samba:

sudo /etc/init.d/samba restart

It should be visible in windows Networks.

ddclient on Raspberry Pi 3

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sudo apt-get install ddclient

Configure for for two different service with two different website to check IP adress:

sudo nano /etc/ddclient.conf

# /etc/ddclient.conf
use=web,, web-skip='Current IP Address: '

## FreeDNS (


To run ddclient as a daemon, set run_daemon to 'true' in /etc/default/ddclient.

Once it is configured as daemon, restart it:

sudo /etc/init.d/ddclient restart

To debug :

sudo ddclient -daemon=0 -debug -verbose -noquiet (-force)

Route with raspian (debian)

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I only want to have some process owned by specific users to use the VPN. This means two route table, or more.


Create a new table "42" for marked packet:

sudo ip rule add fwmark 42 table 42

List all route table:

ip rule list
0:      from all lookup local
32765:  from all fwmark 0x2a lookup 42
32766:  from all lookup main
32767:  from all lookup default

Delete table 42:

sudo ip rule del fwmark 42 table 42

Show "main" table route:

ip route show table main
default via dev wlan0 src metric 303 dev tun0 proto kernel scope link src dev wlan0 proto kernel scope link src metric 303

Add a default route in table 42:

sudo ip route add via dev tun0 table 42

Delete the default route in table 42:

sudo ip route del via dev tun0 table 42

You can delete all routes of a specific table:

sudo ip route flush table 42

Copy all route from table main to table 42:

ip route show table main | while read LINE; do sudo ip route add $LINE table 42; done

Transmission on Raspberry Pi 3

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Install transmission:

sudo apt-get install transmission-daemon

Start and stop transmission daemon:

sudo /etc/init.d/transmission-daemon start
sudo /etc/init.d/transmission-daemon stop

Edit configuration of transmission (stop transmission first):

sudo nano /etc/transmission-daemon/settings.json
"incomplete-dir": "/home/pi/Downloads/torrents/.incomplete",
"incomplete-dir-enabled": true,
"rpc-password": "write_it_here",
"rpc-whitelist": ",192.168.1.*",
"umask": 2,

Check your transmission's IP:

To avoid permission issues:

sudo adduser pi debian-transmission
sudo adduser debian-transmission pi
sudo chmod -R 777 /home/pi/Downloads/torrents
sudo chmod -R 777 /home/pi/Downloads/torrents/.incomplete

Transmission How To

OpenVPN on Raspberry Pi 3

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Know your IP address:


Install OpenVPN:

sudo apt-get install openvpn

Know your route before OpenVPN is connected:


Copy all necessary conf files in:


Interesting settings:

script-security 2
up /etc/openvpn/
down /etc/openvpn/

Start openvpn from command line to test if tun0 mounts:

sudo openvpn --config /etc/openvpn/openvpn.conf

To connect to VPN at startup, put conf file in /etc/openvpn. Example: openvpn will connect at startup to VPN1 and VPN2:


To begin with Raspberry Pi 3

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  • Virtual Keyboard:
    • sudo apt-get install matchbox-keyboard
    • sudo apt-get install florence at-spi2-core [link]
  • Configure remote access for SSH and VNC: sudo raspi-config
  • Change pi password: sudo raspi-config
  • "Install" SFTP server: actually already done when activating SSH

Display basic stuff :

$ while true; do uptime; vcgencmd get_throttled; vcgencmd measure_temp; vcgencmd measure_clock arm; free -h; echo '-----'; sleep 10; done
              total        used        free      shared  buff/cache   available
Mem:          731Mi       297Mi       118Mi        27Mi       316Mi       345Mi
Swap:         2.0Gi       346Mi       1.6Gi

Excel tricks

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1- Generate a calendar in Excel

Here is how to generate a calendar in Excel. Using Excel 2010 in my case.

In cell B1 (by example), put a date :


In cell B2 :


Then you just have to drag-n-drop down and right (or left).

To highlight saturdays and sundays :


Here is the result :<image>

2- Number of days in one month

Put a date in cell B1. Then in another cell, formula is :


It will return the number of days of the month in cell B1.

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