VB6 Winsock UDP server port binding problem

[ri...@mbari.org]

I am trying to create a VB6.0 server to send UDP datagrams to clients
requesting info. The info is the most recent position (lat/lon) read in a
serial port from a handheld GPS receiver). I want to use a a known port on
the server side - eg 4001. And a default port on the clients

I have the VB6 winsock control of the server set to:
MyServerWinsock1.Protocol = sckUDPProtocol
MyServerWinsock1.RemoteHost = "localhost"
MyServerWinsock1.Bind = 4001

At the client:

MyClientWinsock1.Protocol = sckUDPProtocol
MyClientWinsock1.RemoteHost = "localhost"
MyClientWinsock1.RemotePort = 4001

The client does a "senddata" to its socket every few seconds on a timer
when
it wants the data. The server responds by sending it's last good GPS fix
data out vis a senddata on its port.

This all works great until I stop and restart the client or if I try to run
multiple clients. The server fails to respond to any requests until I kill
and restart it.

I dont think I want a broadcast and I dont think I need to establish a TCP
connection. I just want the server to send its short message to any client
that is interested. What am I doing wrong?

Thanks in advance.
Rich Schramm

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[Robin Shen]

Hi Rich,

UDP is connection less protocol and their relationship are peer to peer.
Generally, we need set the server computer's LocalPort property. The client
computer then needs only to set the RemoteHost to the Internet address of
the server computer, and the RemotePort property to the same port as the
server computer's LocalPort property.

However, if you want to use your application with multiple clients, please
set these properties before you use the senddata. Please reference the
article Q192564 for detailed information. You can also get it from
http://support.microsoft.com/support/kb/articles/Q192/5/64.ASP.

Hope this helps,

Robin
robin...@microsoft.com