Network setup

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Network setup

Access using ssh and username local

ssh -X local@<IP>

ask for the password (or look on the course page)

Packages to install

Install:

ntp
ntpdate
openssh-server
git
libreadline-dev

sudo apt install ntp ntpdate openssh-server git libreadline-dev

Install ros-melodic-desktop-full, follow instructions in: http://wiki.ros.org/melodic/Installation/Ubuntu up to section 2. Tutorials.

NTP

Network time protocol, to keep clocks in sync. At DTU most clock sources are blocked, the clock source needs to be configured.

At DTU, edit /etc/ntp.conf, add ntp.ait.du.dk to server pool

...
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool ntp.ait.dtu.dk
...

Sync time

sudo ntpdate -u ntp.ait.dtu.dk

Should work in and around DTU - see also NTP howto for more details.

WiFi network

Now open wpa_supplicant.conf

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

If you added an wifi access point, it probably looks something like this

network={
       ssid="device"
       key_mgmt=NONE
}

or using typical security with a password

network={
       ssid="tdc432"
       psk="secret_password"
       key_mgmt=WPA-PSK
       id_str=home

}

You can add any number of the "network" groups for all the networks you get across If you don't like the network password to be visible, see guide below.

Private network

Generate encrypted key with

wpa_passphrase mySSID secret776

if the desired SSID is "mySSID" and the password is "secret776", then copy the result into /etc/wpa_supplicant/wpa_supplicant.conf (except the line with the password in clear text).

network={
       ssid="mySSID"
       #psk="secret776"
       psk=812439e952156aea9983f3df5a389cf3f9c2e9f30ae2624eaad1551612a6ef71
}

Connecting Raspberry Pi to Eduroam

When connecting to Eduroam you will eventually have to type in your username and password in the wpa_supplicant.conf-file. In order for your password not to be visible, generate a hash-code for it

echo -n password_here | iconv -t utf16le | openssl md4

Copy the hash-code and clear the terminal window

clear

Now open wpa_supplicant.conf

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

Comment out or replace whatever in this file so that the content corresponds to the following

country=DK
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
ctrl_interface_group=0
update_config=1
network={
        ssid="eduroam"
        scan_ssid=1
        key_mgmt=WPA-EAP
        eap=PEAP
        phase2="auth=MSCHAPV2"
        identity="username"
        password=hash:your_hash_code
}

Replace username with your username on Eduroam, i.e. your student number and replace your_hash_code with the hash-code you generated in the previous step.

Reboot the Raspberry Pi

sudo reboot
or
sudo /etc/init.d/networking restart

When the Pi has rebooted, connect to it using SSH once again. Check that the Pi is connected to WiFi

ifconfig

Under wlan0 confirm that the Pi has received an IP (inet addr) and note down the first three sections of the IP - they are most likely 10.16.175.xxx

To see which SSID you are connected to use

iwconfig

The MAC address ('HWaddr' or 'ether') of the Pi should also be noted down - this probably starts with B8:27:EB:xx:xx:xx make sure to get all of it.