Trying to run echo server in Minikube with Istio getting connection refused from client socker

I have a simple echo server (protocol TCP) written in CPP. I am able to put the server in docker container and with port mapping it works. So I think my client server are OK. When I upload the server image in Kubernetes and deploy Istio with ingress Gateway listening on port 31400 which I think is the right one when using tcp I get connection refused from client trying to connect to the socket.
'''apiVersion: apps/v1
kind: Deployment
metadata:
name: tcp-echo-deployment
labels:
app: tcp-echo
system: example
spec:
replicas: 1
selector:
matchLabels:
app: tcp-echo
template:
metadata:
labels:
app: tcp-echo
system: example
spec:
containers:
- name: tcp-echo-container
image: igordptx/my-tcp-server
imagePullPolicy: Always
env:
- name: TCP_PORT
value: "2701"
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: SERVICE_ACCOUNT
valueFrom:
fieldRef:
fieldPath: spec.serviceAccountName
ports:
- name: tcp-echo-port
containerPort: 2701'''
'''
apiVersion: v1
kind: Service
metadata:
name: "tcp-echo-service"
labels:
app: tcp-echo
system: example
spec:
selector:
app: "tcp-echo"
ports:
- protocol: "TCP"
port: 2701
targetPort: 2701
'''
'''
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: echo-tcp-gateway
spec:
selector:
istio: ingressgateway
servers:
- port:
number: 31400
name: tcp-echo
protocol: TCP
hosts:
- "*"

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: tcp-echo-vs-from-gw
spec:
hosts:
- "*"
gateways:
- echo-tcp-gateway
tcp:
- match:
- port: 31400
route:
- destination:
host: tcp-echo-service
port:
number: 2701
'''