To use this Espressif Border Router, first make sure it's properly connected to your Wi - Fi and relevant devices. Then, follow the basic setup steps provided in the user manual to configure the network settings. When it comes to service discovery, the router will automatically detect compatible services. For multicast forwarding, just ensure your network supports it. As for maintenance, keep the router in a dry and cool place. Regularly check for software updates to keep it running smoothly. Also, avoid overloading the router with too many connected devices at once.