final void closeServer() {
		serverManager = null;
		requestHandler.useServer(null);
	}
This method binds the manager with the give server instance. Apps that allow multiple
simultaneous connections and GATT server should use a single server instance, shared
between all clients.

@param server the server instance.
ble/src/main/java/no/nordicsemi/android/ble/BleManager.java