I have a non issue that I am just curious how its working. So I have a wireless doorbell that I built. It works using the gpiod and remote gpio. So I have a chime unit that I built with a Python script to play MP3s. I'm running the systemctl enable and systemctl start commands from the chime raspberry pi. The chime has a static ip that is assigned. I have a second raspberry pi hooked up with a button that is used as the front doorbell. I have a python script that when run waits for that button press. It then finds that static IP and signals a particular pin. In this case pin 18 and runs the program. Because this is done through IP I assumed that this was all working through my wifi. However, my local ISP is experiencing an outage and my internet has been down for three days yet the doorbell still works. Is the chime sending this information through a protocol that does not need the internet and since the IP is static it isn't changing? Honestly I love the idea of being able to build something with remote control functionality but I would love to know how its working.