Socket Accept/Connection Question/Problem

[Eric Chatonet]

Hi Dave,

We use TCP to communicate between a GUI and a process that manages  
internet captures and a SQL db.
Both apps act as a client AND a server.
Initialization sequence is:
1. The main app opens a socket as a client then opens the other app  
as a process.
2. When the process opens it opens another socket as a client and the  
same than the main app as a server.
3. The process sends a message to the main app to ask it to open the  
corresponding socket to act as a server.
If the main app does not receive the message it expects (with a  
timeout we fix) it means that something wrong happened.
Otherwise it sends a 'Done' message to the process.
4. The main app sends a 'ping' message to verify that double client/ 
server connection has been correctly established in both directions.
When all this has been done, you know that communication is OK :-)

Best regards from Paris,
Eric Chatonet.

Le 28 févr. 08 à 14:04, Dave a écrit :

> Hi All,
>
> I am using Sockets to communicate between Applications. In this  
> example, one Application is a "Server" and the other is a "Client".  
> The Server issues a connected command and specifies a Callback  
> handler as so:
>
>   accept connections on theServerPortNumber with message  
> "ServerContactedByClient"
>
> on ServerContactedByClient theIPAddress
>   local myClientIPAddress
>   local myResult
>
>   put the result into myResult
>
>   if myResult <> empty then
>     breakpoint
>     exit ServerContactedByClient
>   end if
>
>   set the itemDelimiter to ":"
>   put item 1 of theIPAddress into myClientIPAddress
>
>   if myClientIPAddress is not among the lines of  
> sgServerClientAllowList then
>     close socket theIPAddress
>   end if
>
>   read from socket theIPAddress for 8 chars with message  
> "ServerReceivedPacketSize"
>
> end ServerContactedByClient
>
> I am testing the error handling when a Client tries to connect but  
> that server doesn't allow it to connect. The  
> "ServerContactedByClient" gets called and the IP address is NOT is  
> present in the "sgServerClientAllowList" (a Script Global), so the  
> close socket is executed. However on the Client I have the  
> following code:
>
>   open socket mySocketAddress with message "ClientSocketOpen"
>
>
> on ClientSocketOpen theIPAddress
>   local myConnectString
>   local myConnectionID
>   local myResult
>
>
>   put the result into myResult
>   if myResult <> empty then
>     breakpoint
>     exit ClientSocketOpen
>   end if
>
>   --
>   --  Send the Connect Message, Start with the Count
>   --
>   put "Connect," & myConnectionID into myConnectString
>   write myConnectString to socket theIPAddress with message  
> "ClientSocketConnectionDataSent"
> end ClientSocketOpen
>
> The "ClientSocketOpen" handler is called but the  
> "ClientSocketConnectionDataSent" handler is never called, as I  
> would expect, since the Server closed the Socket, however, the  
> socketError or sockTimeout handler are not called either?
>
> My question is, how can the Client tell if the connection has been  
> successful or not?

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