I'm quite desperate because I'm trying to configure the access to USB devices with an android app. I've followed the code here.When I do \[code\]getAccessory()\[/code\] or \[code\]getDevice()\[/code\] i always receive NULL. The connection never gets to finish and i don't really know how to fix it. My objective is be able to write and read to and from the usb port. But first at all, I need to be able to recognize and manage the port. Any one know what happens if in that code I don't want to specify my device (with vendor id and product id for example. )Thanks to everyone for reading. Waiting for any inspiring answer ... Laura 