Architecture in installation and configuration manual

[codeofartur]

Almost got it this great project working using the installation and configuration manual - except we don't know if we set up our test environment right:
Working: connecting gateway to controller
Working: client connects to controller
Not Working: controller trigger gateway to open port on gateway for client.

Therefore the question is how the environment should be setup according to the setup manual.
Our current architecture looks as follows and is meant to be as simple as possible in the first step.

Configuration files for the client:
fwknoprc.txt
sdp_ctr_client.conf.txt

Configuration files for the gateway:
access.conf.txt
fwknopd.conf.txt
gate_sdp_ctrl_client.conf.txt
gate.fwknoprc.txt

Gateway iptables configuration script:
iptables_config.sh.txt

To initiate the connection on the client we use a named configuration stanza via this command
fwknop -n service_gate

Will appreciate any help!
Thanks