App: Communication between two components via ZMQ

I have app with 3 components.

• 1 x service (flask, zmq)
• 2 x worker (zmq)

Used language is Python. The library for comunication (messaging) is ZMQ.

I can’t send a request from one component to another.

• service - worker
• worker - worker

Client code

zmq_context = zmq.Context()
socket = zmq_context.socket(zmq.REQ)
socket.connect("tcp://c-3-worker:55555")

socket.send_string("test")
message = socket.recv_string()

c-3-worker is name of server component.

Server code

context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://*:55555")

message = socket.recv_string()
socket.send_string("Pass")

App setting I tried to set internal ports however it was possible only for service (not for worker). Uploaded file was not accepted.

  internal_ports:
  - 55555

What I do wrong?

Thank you for answer.