Hi Shaun, 

Those have recently been moved to session-apps. The short cli help should give 
you an idea of how to configure them: “test echo server ?"

For starters, doing something like: "test echo server uri <transport (eg. tcp, 
udp, sctp)>://<ip>/<port>" starts a server that listens on the ip:port tuple 
for the transport requested.

On a different vpp you can do: "test echo client uri <uri format like above>” 
to connect the client to the server. Note that only the tcp and sctp clients 
are properly supported for now. Additionally, for this to work, the two vpps 
should obviously be configured to have ip layer connectivity between them. 

Let me know if you have more specific questions. 

Regards, 
Florin

> On Feb 1, 2018, at 10:33 AM, Shaun McGinnity <shaun.mcginn...@owmobility.com> 
> wrote:
> 
> Hi,
>  
> Could anyone point me to documentation or a tutorial on using the built-in 
> UDP / TCP servers under ./src/vnet/udp and ./src/vnet/tcp ?
>  
> Regards,
>  
> Shaun
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