Add powersave config to network manager (#86)

* Add powersave config to network manager

* Update network.md

Documentation/network.md

@@ -5,13 +5,31 @@ Currently only manual configuration using NetworkManager connection files is sup
 
 ## Configuration Examples
 
-You can look also into [Official Manual][keyfile] or there are a lot of examples accross internet.
+You can look also into [Official Manual][keyfile] or there are a lot of examples accross internet. The system is read only, if you not want change the IP address every boot, you should set the uuid property with a generic [UUID4][uuid].
+
+### Default
+
+We have a preinstalled connection profile:
+```
+[connection]
+id=HassOS default
+uuid=f62bf7c2-e565-49ff-bbfc-a4cf791e6add
+type=802-3-ethernet
+
+[ipv4]
+method=auto
+
+[ipv6]
+addr-gen-mode=stable-privacy
+method=auto
+```
 
 ### LAN
 ```ini
 [connection]
 id=hassos-network
-type=ethernet
+uuid=d55162b4-6152-4310-9312-8f4c54d86afa
+type=802-3-ethernet
 
 [ipv4]
 method=auto
@@ -25,7 +43,8 @@ method=auto
 ```ini
 [connection]
 id=hassos-network
-type=wifi
+uuid=72111c67-4a5d-4d5c-925e-f8ee26efb3c3
+type=802-11-wireless
 
 [wifi]
 mode=infrastructure
@@ -54,5 +73,26 @@ address1=192.168.1.111/24,192.168.1.1
 dns=8.8.8.8;8.8.4.4;
 ```
 
+## Tips
+
+### Reset network
+
+If you want reset the network configuration to default, use follow commands on host:
+```bash
+$ rm /etc/NetworkManager/system-connections/*
+$ cp /usr/share/system-connections/* /etc/NetworkManager/system-connections/
+$ nmcli con reload
+```
+
+### Powersave
+
+If you have trouble with powersave you can do following:
+```ini
+[wifi]
+# Values are 0 (use default), 1 (ignore/don't touch), 2 (disable) or 3 (enable).
+powersave=0
+```
+
 [keyfile]: https://developer.gnome.org/NetworkManager/stable/nm-settings.html
 [configuration-usb]: configuration.md
+[uuid]: https://www.uuidgenerator.net/