docs: added notes on sfp module and how to configure it

knowledge base/uci.md

@@ -9,6 +9,17 @@ Command line utility for OpenWrt's UCI system.
 uci show
 uci show 'dhcp'
 
+# Show changes to the settings.
+uci changes
+uci changes 'dhcp'
+
+# Commit changes.
+uci commit
+uci commit 'dhcp'
+
+# Reload the configuration
+reload_config
+
 # Show what interface is the WAN.
 uci show network.wan.device | cut -d "'" -f 2
 
@@ -17,14 +28,15 @@ uci add dhcp host
 uci set dhcp.@host[-1].name='hostname'
 uci set dhcp.@host[-1].mac='11:22:33:44:55:66'
 uci set dhcp.@host[-1].ip='192.168.1.2'
-
-# Show changes to the settings.
-uci changes
-uci changes 'dhcp'
-
-# Commit changes.
-uci commit
 uci commit 'dhcp'
+reload_config
+
+# Use a different port as WAN switching it with one in LAN.
+uci set network.wan.device='lan4'
+uci del_list network.br_lan.ports='lan4'
+uci add_list network.br_lan.ports='eth2'
+uci commit 'network'
+reload_config
 ```
 
 ## Further readings
@@ -33,8 +45,13 @@ uci commit 'dhcp'
 
 ## Sources
 
+- [The UCI system]
+- [Turris Omnia]
+
 <!-- project's references -->
 [the uci system]: https://openwrt.org/docs/guide-user/base-system/uci
 
 <!-- internal references -->
+[Turris Omnia]: turris.md
+
 <!-- external references -->