I’m trying to develop some broker API plugin for Zorro, but lost a little with mechanism of an asset subscription.

I'm looked thru code at FXCMplugin.cpp - BrokerAsset() function implementation and don't see any code that push data from Broker to Zorro after subscribes an asset was established. Can you explain mechanism, how I should implement broker API event handler, when new data on subscribed asset arrived from broker? How should I pass it to Zorro?