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= PubSub Forwarder
This is a trivial example of a forwarder/proxy for the pub/sub pattern.
The concept is as follows: the forwarder will listen for connections on
both a front-end port and a back-end port. The front-end will act as a
subscriber so that publishers can publish to it. The back-end will act
as a publisher so that subscribers can subscribe to it. The front-end
then forwards to the back end.
== Compiling
CMake with ninja-build is simplest:
[source, bash]
----
cmake -GNinja -B build
cd build
ninja
----
Or if you prefer a traditional approach,
the following is an example typical of UNIX and similar systems like
Linux and macOS may appeal:
[source, bash]
----
export CPPFLAGS="-I /usr/local/include"
export LDFLAGS="-L /usr/local/lib -lnng"
export CC="cc"
${CC} ${CPPFLAGS} pubsub_forwarder.c -o pubsub_forwarder ${LDFLAGS}
----
== Running
An example setup for running this example would involve the following:
. Step 1: Run this example binary (in the background or a terminal, etc)
. Step 2: In a new terminal, run the following
[source, bash]
----
nngcat --sub --dial "tcp://localhost:3328" --quoted
----
. Step 3: In a second terminal, run the same command again to give us two subscribers
[source, bash]
----
nngcat --sub --dial "tcp://localhost:3328" --quoted
----
. In a third terminal, run the following to publish a counter
[source, bash]
----
for n in $(seq 0 99); do nngcat --pub --dial "tcp://localhost:3327" --data "$n"; done
----
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