Does the HP LaserJet Pro MFP M28-M31 support Wi-Fi Direct for mobile printing?
Wi-Fi Direct for mobile device printing is not supported on multiple models in the M28-M31 series. Refer to the technical specifications table for your specific model number to verify support. (Page 6)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 6
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