Xiaomi
Add a Printer via IP Address or Wi-Fi Direct auf Xiaomi
Xiaomi phones normally detect printers through network discovery once both devices join the same Wi-Fi network. This works well with most modern printers that support standard printing protocols over the local network.
Detection fails when the printer sits on a different subnet, when a firewall blocks discovery traffic, or when the printer only offers Wi-Fi Direct instead of joining your home network. In these cases MIUI still lets you add the printer manually through the system printing service.
Open Settings ➔ Connection & sharing ➔ Printing ➔ System printing service ➔ More ➔ Add printer. From here you have two options: Enable Wi-Fi Direct printing if the printer supports a direct peer-to-peer connection, or Add printer by IP address if you know the printer's network address.
For the IP method, enter the Hostname or IP address shown on the printer's own display or network settings page, then tap Add. The phone attempts to load the correct driver automatically once the connection succeeds.
If the printer still does not respond, double-check that both devices are on the same network segment and that the printer's IP has not changed since you last checked it, since many printers rotate their address after a router reboot.