> Good evening,
> 
>  
> 
> I read this very interesting explanation about UDP-server, UDP-client by
> Lukas Gebauer (see below).
> 
>  
> 
> My additional question is : does Synapse do UDP checksum verification? I
> read somewhere that this is optional for UDP.
> 
>  
> 
> In other words, when I send data (10 bytes only) in a UDP datagram, shall I
> provide my own checksum (in the data block itself) or can I rely on UDP
> checksum mechanism of Synapse?

Synapse does not do checksums. It is job for underlaying Winsock 
layer. Synapse working with payload only.

So, you send 10 bytes by Synapse. Synapse pass 10 bytes into winsock 
(or other sockat layer interface), and winsock made UDP datagram with 
all needed headers and checksums.

On Receive Winsock read datagram, check checksum. And if all is OK, 
then it pass to Synapse 10 bytes of data.

Sometimes you can control how Winsock handle checksums by setsockopt 
call. But it is depended on platform and operating system version. 

See this:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms738603%28v=
vs.85%29.aspx



-- 
Lukas Gebauer.

http://synapse.ararat.cz/ - Ararat Synapse - TCP/IP Lib.
http://geoget.ararat.cz/ - Geocaching solution


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