Nginx + mod_push how to use broadcast?

Question

linux

configured the module like this ... but messages in the chat reach one by one, although it costs broadcast

location /publish/ {
    set $push_channel_id $arg_cid;
    push_store_messages off;
    push_publisher;
  }
  location /listen/ {
    add_header Access-Control-Allow-Origin *;
    push_subscriber_concurrency broadcast;
    set $push_channel_id $arg_cid;
    default_type application/json;
    push_subscriber;
  }

Answer 1

I had to do it in php!