Although you can still subscribe after the RPC is connected, note that if you do you may miss events sent before the subscription.

Although you can still register methods after the RPC is connected, note that if clients call the method before registration they will see an error for an undefined method.

Once connect is called the counterparty can start calling methods and sending notifications. Any methods that should be callable at that time should be registered beforehand, as should any subscriptions to the event bus. Calling connect twice will raise.