I create a plugin for ionic 1 but i update my app to ionic 3, how can i make this plugin work

i create a plugin with java libraries to connect a special bluetooth device it works fine on ionic v1, but i have updated my project to ionic 3, so i want to know how to make it work, do i have to create an @ionic/native module?(if so please some info how to do it) or i can call it directly somehow? thanks guys appreciate it

How were you using it in Ionic v1?

In general Cordova plugins work exactly the same. You can or may build and use an Ionic Native wrapper, but this surely is not necessary.