Expert for mobile app printing functionality for 80mm printer

We have a mobile app already and one of the requirements is to connect to bluetooth and wi-fi printers and add them so that the user can save the configuration of the printers and print directly pdf or images to these printers saved. We have tested for some printers but have some issues with some others e.g. Star bluetooth printer. We would like someone to be able to help us with this ideally without creating custom functionality. One approach we are considering is creating an SDK to import to the project