Writing a UNIX Device Driver

NEWNEWLIU Bluetooth 5.0 Adapter Audio Receiver for Audi,AMI MMI Bluetooth Car Kits Music Interface Cable,Wireless Audio Music Interface Cable Adapter for MMI 2G 3G 3G+ System VW Audi A5 8T A6 4F A8 4E

NEWNEWLIU Bluetooth 5.4 AUX Car Adapter,[Dual Connection & Mic Noise Cancellation],Bluetooth Aux Receiver with 3.5mm Nylon Braided Cable,Plug & Play for Car Music/Hands-Free Calls/Stereo Audio(Orange)

ZOACHII Bluetooth 5.4 Car Aux Adapter, Handsfree Calls, Wireless Music Streaming for Car Home Stereo Speakers Audio System

YuYue Electronic Car Wireless Bluetooth Receiver USB 3.5MM Aux Media Bluetooth 5.0 Music Player Audio Adapter

HVMLAK Aux Bluetooth 5.2 Car Adapter, USB Powered 3.5mm Jack, Handsfree Call, Music Streaming for Trucks Hi-Fi Home Stereo Systems

Bluetooth Car Adapter 3 in 1 FM Transmitter Car Radio Bluetooth Transmitter with Phone Holder, QC3.0 Fast Charging, Strong Microphone, HiFi Bass Sound, Hands-Free Call, Support USB/TF Drive

Bluetooth Receiver Car Kit Compatible with Audi A3 A4 A5 A6 A7 S3 S4 Q3 Q5 Q7,Wireless Music Interface AMI MMI Adapter,Premium CSR Chipset HiFi Sound,Compatible with iPhone iPod Android 2G

12V Aux Bluetooth 5.0 Adapter Module Music Receiver Car kit with 2 RCA Input Aux Audio for Car Radio Stereo Speaker