Hello, 

I'm new to C patterns and I am experimenting with libuv to write a 
simulator. The idea is to create a context struct to be passed around as a 
pointer/handle to various timed and event based callback functions. I would 
like this simulator to have a "heartbeat" that sends UDP every x period, as 
well as respond to UDP messages received on a different port. I would like 
the system to decides at runtime if there are flags in the context that 
block it from sending (i.e. handle->send=0;). 

For bonus points, I would like to be able to start a TCP based module if I 
receive a certain message on the UDP receive port and then stop it once the 
routine completes. I am hoping I can just drop a routine on the default 
loop (from within my uv_udp_recv_cb) for processing until completion which 
would be signaled in a TCP callback (haven't delved into the TCP stuff 
yet...).

After about 1 hour of searching I haven't found any examples of what I am 
trying to do. Most of the example patterns are very simplistic. This dearth 
of information leads me to one of two conclusions: 1) I am trying to do 
something the wrong way or 2) nobody in the entirety of using libuv has 
ever ever ever tried to do what I am attempting now. I assume the problem 
is the former. ;)

What I have so far:

- An example udp listener from the docs. It listens faithfully on the port 
I assign.
- A udp client, again from the docs. My first kick simply sends a message 
and then exists . My next planned attempt was to use a timer to send the 
information repeatedly. I have realized that the timer callback needs to 
have my context handle, which prompted this question. I will finish my 
example code and then post it here while awaiting a possible answer. 

Please let me know if I can provide some more background (context? tee 
hee). 

Regards, 

Russ

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