Prerequisites

To run the test WebSocket client on your machine, make sure you have the following packages installed:

$ sudo yum install -y nodejs
$ npm install websocket

Deploy test workload

$ ./deploy.sh

Run test client targeting secure edge terminated route

$ ./run-cli.sh
WebSocket Client Connected
echo-protocol Connection Closed

real	0m5.611s
user	0m0.121s
sys	0m0.016s

Note: default tunnel timeout is used (5s)

Change route to unsecured

$ oc apply -f ./unsecured-route.yaml

Run test client targeting unsecured route

$ ./run-cli.sh
WebSocket Client Connected
echo-protocol Connection Closed

real	0m15.387s
user	0m0.103s
sys	0m0.022

Note: route's tunnel timeout is used (15s)

Setting the timeout to higher values

By default the test client does not send anything and has keepalives disabled. That makes it a subject for the router's client timeout which is set to 30s by default.
Therefore the client timeout needs to be increased in order to test the tunnel timeout higher than 30s:

oc explain ingresscontroller.spec.tuningOptions.clientTimeout
GROUP:      operator.openshift.io
KIND:       IngressController
VERSION:    v1

FIELD: clientTimeout <string>

DESCRIPTION:
    clientTimeout defines how long a connection will be held open while waiting
    for a client response.
     If unset, the default timeout is 30s