Add IoT, Maintenance and Router pages

maintenance.org

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+#+TITLE:System maintenance
+#+SETUPFILE: ./setup/org-setup-file.org
+
+https://wiki.archlinux.org/title/System_maintenance
+
+* Update
+** System packages
+To check packages to update:
+#+begin_src bash
+paru -Qu
+#+end_src
+
+And then to perform the update:
+#+begin_src bash
+paru
+#+end_src
+
+** NPM
+First update =npm= itself
+#+begin_src bash
+sudo npm install npm@latest -g
+#+end_src
+
+Then, we can list outdated packages:
+#+begin_src bash
+npm outdated -g --depth=0
+#+end_src
+
+And finally perform the update:
+#+begin_src bash
+sudo npm update -g
+#+end_src
+
+** PIP
+First upgrade =pip= itself:
+#+begin_src bash
+/usr/bin/python3 -m pip install --upgrade pip
+#+end_src
+
+Then list outdated packages:
+#+begin_src bash
+pip3 list --outdated
+#+end_src
+
+And update everything with:
+#+begin_src bash
+pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip3 install -U
+#+end_src
+
+** Emacs and Vim
+Update Doom emacs with:
+#+begin_src bash
+doom up
+#+end_src
+
+And Vim packages with:
+#+begin_src bash
+nvim -c PlugUpgrade -c PlugUpdate
+#+end_src
+
+* Check problems in the system
+First check for failed services:
+#+begin_src bash
+systemctl --failed
+#+end_src
+
+Same for user services:
+#+begin_src bash
+systemctl --user --failed
+#+end_src
+
+Look for errors in the logs:
+#+begin_src bash
+sudo journalctl -p 3 -b
+#+end_src
+
+* Check orphan and dropped packages
+Run the following to list all orphan packages:
+#+begin_src bash
+pacman -Qtdq | fzf --preview 'pacman -Qil {}' --layout=reverse --bind 'enter:execute(pacman -Qil {} | less)'
+#+end_src
+
+Then, either remove the unused packages or set the package to "explicitly installed" with:
+#+begin_src bash
+sudo pacman -D --asexplicit package_name
+#+end_src
+
+Use the =ancient-packages= ([[https://aur.archlinux.org/packages/ancient-packages/][link]]) command to list dropped packages (packages may longer in the remote repositories, but still on the local system):
+#+begin_src bash
+ancient-packages
+#+end_src