[ale] USB port identification

[Chris Fowler]

> From: "Alex Carver" <agcarver+ale at acarver.net>
> To: ale at ale.org
> Sent: Thursday, November 19, 2015 10:26:11 AM
> Subject: Re: [ale] USB port identification

> Write the udev rules to look at the vendor and product ID fields and
> then perhaps the bus/sevice fields too. Use a unique combination of all
> four fields to identify a single device. If the devices always come up
> in the same order no matter which physical port they are using then all
> four fields should stay unique during each boot.

> Also double check what happens in the different configurations with
> lsusb and see if there are any other udev rules in place already that
> might be interfering.

I have 500 USB->Serial adapters in boxes in my garage. Same vendor id and same product id. 
They are not unique at all. All the same. 

Here is the problem. Look at the Ralink device 

[root at localhost]# lsusb 
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 
Bus 003 Device 003: ID 0572:1340 Conexant Systems (Rockwell), Inc. 
Bus 003 Device 002: ID 15d9:0a37 Trust International B.V. Mouse 
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub 
Bus 001 Device 004 : ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter 
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub 
Bus 001 Device 002: ID 8087:07e6 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 

Now, I'll unplug and plug it back in the SAME USB port. 

[root at localhost]# lsusb 
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 
Bus 003 Device 003: ID 0572:1340 Conexant Systems (Rockwell), Inc. 
Bus 003 Device 002: ID 15d9:0a37 Trust International B.V. Mouse 
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub 
Bus 001 Device 005 : ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter 
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub 
Bus 001 Device 002: ID 8087:07e6 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 
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