Secure Joining Smart Devices

Hello Community,
I am working on smart home devices based on ZigBee, Z-Wave & WIFI.
I would like to make our devices Homey App compatible. But I also want to make sure that App has security standards.
As the Zigbee devices have no standards for security. i.e. while open the network for joining all Zigbee devices get added to the network without any validation.
& once the device gets added, it will open ways to sniff the network.
I would like to know,
How will the Homey app manage security (either on the software or hardware side) to add only concerning devices to the network to avoid network sniffing?