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Multicast DNS (mDNS) is a networking protocol designed to resolve hostnames to IP addresses within small networks, without the need for a local DNS server. It requires no configuration (zero-configuration) and uses the same programming interfaces, packet formats and operational semantics as unicast Domain Name System (DNS). It was designed to work as either a standalone protocol or alongside standard DNS servers. mDNS can work together with DNS Service Discovery (DNS-SD), a complementary zero-configuration networking technique specified separately in RFC 6763. …

In this post I explain how to control a PoE port on a TP-Link switch (TL-SG108PE) from Home Assistant. Since these small switches don’t support SNMP, I’ll use curl to authenticate, turn on, turn off or query the status of a specific port. The use case is being able to turn on or off a ReoLink PoE camera connected to one of the ports from Home Assistant. …