How do I set up the printer to print using Wi-Fi Direct from a mobile device?

Wi-Fi Direct is only available on models with the optional HP Jetdirect 3100w BLE/NFC/Wireless Accessory installed. To enable it, go to Settings > Networking > Wi-Fi Direct > Status on the control panel and select On, then tap OK. This allows wireless printing directly between a Wi-Fi-capable device and the printer without needing a wireless router. (Page 62)