I have what I consider to be a pretty extensive Home Automation setup.
I use the program HomeAssistant on a Raspberry Pi3 with an Aeotech ZWave controller . Also I have some wifi devices such as a Nest Thermostat, Ring Doorbell, Ethernet Security Cameras, a WiFi Light Switch, and some smart light bulbs.
An RTL_TCP server first of all is a taking a USB Software Defined Radio and setting it up as a server for receiving radio signals within the frequency parameters of the SDR device which can them be connected to from anywhere. For example an RTL-SDR Version 3 operates from about 500 kHz (with direct sampling enabled) to about 1.7 GHz.
So if you set up the server you can be anywhere provided your server allows incoming connections to the internet or you can access your network via VPN, as I do, and connect back to it and hear all the local radio stations or radio signals that interest you.
What good is that? Maybe there is a radio program you like but the station doesn’t stream. Maybe you want to hear your kid playing his high school football game broadcast on local radio. Maybe you set a microphone and transmitter up in your home as a security device (such as a baby monitor). Maybe you want to listen to the local weather broadcast or maybe you are a scanner junkie and like hearing your local police scanner. Whatever. There are lots of reasons.
I am always blathering on about network security. The only real security is a firewall. Your router that you bought on Amazon or at Walmart is NOT secure. Look at the box. It says it is FAST. It doesn’t say it is secure. Furthermore there is a sticker on the bottom of it with a WiFi password that looks like this:
That’s awesome. It really is.
So then you plug your router into the cable modem which attaches it to the INTERNET via direct physical connection. Guess what the password is for that direct physical connection?