First part, detailed description and implementation in Go.

The following code generates C++ header file from FlatBuffers schema and builds executables in bin folder:

mkdir build
cd build
cmake ..
make

First, we run the router, which is a receiver:

./bin/reader

It listens on tcp://*:5555".

Secondly run the dealer, which sends data to the router:

./bin/writer

You should now see the received data in the router STDOUT:

Received request for Median on axis 0
Description: do any calc
Number of values: 

Alternatively you can run applications from Go implementation. They are based on the same FlatBuffers schema and are interchangeable.

C++ is a router, Go is a dealer:

./bin/reader
go run $GOPATH/src/github.com/igorskh/flatbuffers-zmq-tutorial/writer/main.go

Output:

Received request for Average on axis 0
Description: do something
Number of values: 5 

Go is a router, C++ is a dealer:

go run $GOPATH/src/github.com/igorskh/flatbuffers-zmq-tutorial/reader/main.go
./bin/writer

Output:

2020/02/12 12:24:14 router created and bound
2020/02/12 12:24:15 router received from '[0 60 125 57 156]'
Got request:  do any calc
Calc axis:  0
Values:  5
[0 1 2 3 4]
Calculating Median
Result:  1.5