[Rxtx] loopback puzzle

[Dr. Stephen Judd]

Your comment about the kernel probably indicates you are discussing  
Linux.
I'm running on Mac OSX 10.4.7, which traditionally has a big emphasis on
plug and play. Can I get those ports to appear on the Mac? How?
Do I have to use something other than RXTX to get there today?
sj

On 2006 Sep 11, at 7:29 PM, Trent Jarvi wrote:

>
> Hi Stephen
>
> The kernel probably already does everything needed.  Eventually, we  
> will
> be receiving those events and sending events to applications that a  
> device
> was plugged in. Depending upon the OS, either the kernel events are  
> not
> detectable or rxtx ignores them at this time.
>
> Right now the commports are enumerated when RXTXCommDriver's static
> initialize is called.  Thats usually the first
> 'CommPortIdentifier.getPortIdentifiers();' thats called. This is in
> RXTXCommDriver.java.  A small enhancement that many folks would  
> like would
> be to allow rescanning of ports.  Restarting the application after
> changing hardware is the usual path.  Also consider that we do not
> currently make special efforts to deal with hardware vanishing.
>
> Whatever error you see after hardware is removed was not thought of  
> as a
> flow control path for UARTs being ripped off the motherboard.  It just
> wasn't something that happened.
>
> On Mon, 11 Sep 2006, Dr. Stephen Judd wrote:
>
>> AH!  great.
>> So my mental model was reasonable, but ahead of its time.
>> Now how do I adjust my mental image? Does rebooting the machine
>> change anything? How do I get to those new ports?!
>> sj
>>
>> On 2006 Sep 11, at 7:00 PM, Trent Jarvi wrote:
>>
>>>
>>> Hi Stephen
>>>
>>> The CommAPI 'specification' was written before ports could vanish  
>>> and
>>> appear.  There isn't a means of catching 'hotplug' events yet.  For
>>> all
>>> practical purposes, the hardware should not change while using  
>>> CommAPI
>>> 2.0.  This shortfall has been discussed as a possible addition to
>>> future
>>> 'standards' which rxtx will support.  For now, you have to adjust  
>>> your
>>> mental image :)
>>>
>>> On Mon, 11 Sep 2006, Dr. Stephen Judd wrote:
>>>
>>>> Many thanks to Dr. Lyon, Joachim Buechse, and Bob Jacobsen.
>>>>
>>>> Building on what I have learned from this group, my mental model  
>>>> has
>>>> arrived at the point where I believe that the mere plugging in of
>>>> a port
>>>> expander (like the DUAL PORT USB to Serial RS-232 DB-9 Adapter  
>>>> Cable)
>>>> will automagically change the list of ports available to
>>>> CommPortIdentifier.getPortIdentifiers().
>>>>
>>>> Experiments say this is not true however. Using same SerialDemo as
>>>> described below, the list does not change, even after plugging a
>>>> live device
>>>> into one of the resulting RS-232 ports, and restarting the app.
>>>>
>>>> What's broken now? my hardware? or still my head?
>>>> sj
>>>>
>>>> On 2006 Sep 7, at 8:40 AM, Dr. Douglas Lyon wrote:
>>
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