code: public void unsubscribe(String channel) {
  		ChannelSubscription subscribedChannel = subscribedChannels.get(channel);
  
  		if (isUnsubscribeValid(channel, subscribedChannel)) {
  			subscribedChannel.setSubscribeOnReconnected(false);
  			unsubscribe(channel, true, subscribedChannel.isWithNotification());
  		}
  
  		//subscribedChannels.remove(channel);
  	}
docs: Stop receiving messages in the specified channel
  
  @param channel
  Channel to be unsubscribed