Getting Online

Note that Raspbian does not have NetworkManager installed to setup your network. You need to setup network manually in old-school Debian way.

Setting up wireless connection

For testing and compilation purposes it can be useful to temporarily connect Raspberry Pi box to local wi-fi network.

Convince yourself that the interface wlan0 is defined.

 $ sudo nano /etc/network/interfaces

The file should contain following lines:

 allow-hotplug wlan0
 iface wlan0 inet manual
     wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Fire up the wlan0 interface
```
 $ sudo ifup wlan0
```
Define new connection to wpa_supplicant.conf.
```
 $ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
```
Add following lines (replace SSID and passphrase with actual SSID and passphrase for your network).
```
 network={
     ssid="SSID"
     psk="passphrase"
     key_mgmt=WPA-PSK
 }
```
Reconfigure wpa_supplicant.
```
 $ sudo wpa_cli reconfigure
```

Check if the wlan0 interface received an IP address.

 $ ifconfig
 wlan0     Link encap:Ethernet  HWaddr b8:27:eb:d3:65:d2
           inet addr:10.200.136.38  Bcast:10.200.139.255  Mask:255.255.252.0
           inet6 addr: fe80::d877:a0ac:9f28:ac15/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:3114 errors:0 dropped:200 overruns:0 frame:0
           TX packets:3577 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:324640 (317.0 KiB)  TX bytes:587899 (574.1 KiB)

Note that wireless connection should be used only for testing and development.

Permanently disable wireless connection

Since observatory controller should be connected to LAN via wired connection, it is good idea to disable wireless interface and permanently unload wireless adapter kernel modules.

Disable wireless interface.
```
 $ sudo ifdown wlan0
```

Remove wlan0 interface from the network configuration.

 $ sudo nano /etc/network/interfaces

Comment out following lines:

 # allow-hotplug wlan0
 # iface wlan0 inet manual
 #     wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Then we can permanently turn off the wireless adapter:
```
 $ sudo nano /boot/config.txt
```
Add following line to the file:
```
 dtoverlay=pi3-disable-wifi
```
Reboot Raspberry Pi
```
 $ sudo reboot
```

Setting wired connection via DHCP

If your router is assigning your Raspberry Pi a stable IP based on MAC address, setup of your Ethernet interface is rather simple.

Disable ethernet interface.
```
 $ ifdown eth0
```

Configure eth0 interface to use DHCP.

 $ sudo nano /etc/network/interfaces

Modify lines related to eth0 to the following.

 auto eth0
 allow-hotplug eth0
 iface eth0 inet dhcp

Enable ethernet interface.
```
 $ sudo ifup eth0
```

Setting static wired connection

Disable ethernet interface.
```
 $ ifdown eth0
```

Configure static interface parameters

 $ sudo nano /etc/network/interfaces

Modify lines related to eth0 to the following. Note that actual IP addresses depends on your network.

 auto eth0
 iface eth0 inet dhcp
     address 192.168.1.108
     netmask 255.255.255.0
     gateway 192.168.1.1
     dns-nameservers 12.34.56.78 12.34.56.79

Enable ethernet interface.
```
 $ sudo ifup eth0
```

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