RE: Calling for socket type opinions...

[Tom Daly <Tdaly@xxxxxxxxxxxxxx>]

Andy,

If the handheld RF has either a fixed IP address or a ID# of some sort that
is sent along with each "message" then you could do something like this.
Either flag a record in a file which is keyed by the ID# or IP address, or
lock an object.  In either case, once a connection is started check to see
if a job is already active for this ID or address.  If a job is active then
end it and let the new job take over.

I prefer the lock method because if a job ends abnormally for some reason
the lock is released, while a record would still indicate "active"

Tom Daly
 |  -----Original Message-----
 |  From: Andy Holmer [mailto:aholmer@xxxxxxxxxx]
 |  Sent: Friday, September 19, 2003 12:58
 |  To: rpg400-l@xxxxxxxxxxxx
 |  Subject: Calling for socket type opinions...
 |  
 |  At the risk of starting an uproar - I have a socket opinion 
 |  question.
 |  
 |  I am writing an application for a barcode handheld that 
 |  will communicate
 |  back to a 400 running a socket server program.  The 
 |  handheld will be RF
 |  and there may be a couple hundred talking to an RPG socket server
 |  program at any one time.  I will be writing the server 
 |  first, as soon as
 |  the protocol is decided.
 |  
 |   
 |  
 |  The question is:  Would it be better to use the TCP 
 |  protocol and have a
 |  socket listen() and create more descriptors, or would UDP be more
 |  appropriate?  My TCP hang up is that the connections may be 
 |  broken by
 |  walking into an area of no RF coverage or the handheld going into
 |  standby mode.  My UDP hang up is, well, it's UDP.
 |  
 |   
 |  
 |  Your thoughts?
 |  
 |                                      
 |  
 |  Andy Holmer
 |  
 |  1095 Nimitzview Drive
 |  
 |  Suite 403
 |  
 |  Cincinnati, OH 45230
 |  
 |  (513) 232-9100
 |  
 |  f-(513) 232-9249
 |  
 |   
 |  
 |  
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