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Newsgroups: comp.lang.ada
Date: Wed, 6 Feb 2019 21:28:20 -0800 (PST)
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Subject: Re: Ada x <whatever> Datagram Sockets
From: "Rego, P." <pvrego@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:55450
Date: 2019-02-06T21:28:20-08:00
List-Id: <comp.lang.ada>

On Wednesday, February 6, 2019 at 10:42:56 PM UTC-2, Jere wrote:
> On Wednesday, February 6, 2019 at 6:10:37 PM UTC-5, Rego, P. wrote:
> > I am trying to communicate a Windows Ada application with another application in the same machine (an specific C++ porting called MQL) using datagram sockets. The core Ada app was extracted from GNAT.Sockets documentation, from the ping-pong caller. 
> > *SNIPPED*
> > 
> > The problem is that when I send the message (from MQL side), my Ada server returns
> > 
> > raised GNAT.SOCKETS.SOCKET_ERROR : [10040] Message too long
> > Call stack traceback locations:
> > 0x424e6c 0x426ddb 0x426e17 0x4200a8 0x42174e 0x4019fc 0x40246d 0x4013db 0x74198482 0x778f3ab6 0x778f3a86
> > 
> > and investigating the libraries, Channel : SOCKETS.Stream_Access will really receive any data size.
> > 
> > So... how can avoid the exception?
> > 
> > Thanks!
> 
> How big of a message are you trying to send?  Datagram sockets have
> an upper limit on the payload size (65507 bytes for ipv4) regardless
> of the language.

Just the string "test". I also confirmed that the MQL container (uchar data[]) has really the size 5.

I also forgot to mention that the communication from both client-server applications show no problem at all, I mean, MQL to MQL and Ada to Ada have no errors. The problem comes only when trying MQL to Ada.