How to make ActionCable use its own namespace in Redis?

Question

Ruby on Rails

Morning in the house, dear!
ENV: ruby ​​2.4.1, rails 5.1, nginx 1.10.3
There is a server running 3 identical services. Each of the services uses WebSockets.
All channel settings are the same. The difference is only in the cable.yml config
For the first service:

production: &production
  adapter: redis
  url: redis://localhost:6379/1

For the other two
urls: redis://localhost:6379/2 and url: redis://localhost:6379/3 respectively.
Channel:

class MessagesChannel < ApplicationCable::Channel  
  def subscribed
    stream_from 'messages'
  end
end

When sending a message to a channel by one of the services, it arrives to the subscribers of others.
Shipping:

ActionCable.server.broadcast('messages', message.to_json)

How to overcome this misunderstanding? Where to dig?
PS: I tried to spread through different channels - the same eggs only in profile.
UPD:
I made it with the gem 'action_cable_subscription_adapter', but I would like to use regular tools, of course.