I want to create a mobile app with Ionic. I need a bluetooth plugin that can connect multiple devices regardless of the operating system (can be ios or android).
Does cordova or phonegap or jquery support this?
There are several Cordova plugins to manage with bluetooth, see:
http://cordova.apache.org/plugins/?q=bluetooth
For example:
https://github.com/randdusing/cordova-plugin-bluetoothle
or
https://github.com/don/BluetoothSerial
These plugins are available both for iOS and Android, and as Ionic is based on Cordova you can develop your Ionic app using all Cordova plugins.