iOS has no support for printing via Bluetooth.
The only support for printing via Bluetooth is using apps specifically made for those printers, usually by the manufacturer. While HP has several printing apps in the App Store, as far as I know none of them support bluetooth on the OfficeJet 150 ( couldn't find an HP150 model) or its other Bluetooth printers.
I could be wrong. I haven't read all the notes about all the printers; but I notice that HP's own documentation about the printer only mentions the ability to print from Windows, Blackberry, and Android phones.