socketcluster-server + sc-broker-cluster

Hello,

Could it be possible to get some information or guidance on how to implement the sc-broker-cluster with the socketcluster-server ?

When I set the brokerEngine to 'sc-broker-cluster' in the options I'm getting the following error :

/tmp/scc/app/node_modules/socketcluster-server/scserver.js:101
  this.brokerEngine.once('ready', function () {
                    ^
TypeError: this.brokerEngine.once is not a function
    at new SCServer (/tmp/scc/app/node_modules/socketcluster-server/scserver.js:101:21)
    at Object.module.exports.attach (/tmp/scc/app/node_modules/socketcluster-server/index.js:65:29)
    at Object.<anonymous> (/tmp/scc/app/server:15:36)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
    at startup (internal/bootstrap/node.js:240:19)```


Thanks !

Start with the brokerEngine setup in scserver.js around line 101 and the attach path in index.js around line 65, then compare it with the server configuration at server line 15. Reproduce the TypeError with sc-broker-cluster and determine what integration guidance or documented configuration is missing; done means the setup is explained clearly or the reported incompatibility is resolved.