Execute an application on Mac OS X when a particular type of USB device is connected?

Question

I need to implement a Mac OS X application. In my application I need to do two things:

1. Execute / Open an application when a particular type of USB device is c

Answer 1

You can use launchd. Try man launchd and man launchd.plist.

It seems that launchd can work with USB events, even though this feature is poorly documented. I found it on: man xpc_set_event_stream_handler

Here's an example. If you put the following into: ~/Library/LaunchAgents/com.example.plist, your program should start when a USB device is connected.

    Label
    com.example.program
    ProgramArguments
    
    /path/to/program
    
    LaunchEvents
    
            com.apple.iokit.matching
            
                    com.apple.device-attach
                    
                            idProduct
                            1234
                            idVendor
                            1337
                            IOProviderClass
                            IOUSBDevice
                            IOMatchLaunchStream