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I'm looking for a build your own or mod hack something like a POE ethernet passthrough that powers an Arduino IoT controller. I understand that what ever I am using will need it's own dedicated IP stream but given how small some things have gotten I though a small female to female ethernet device that carries a light or temp sensor would be neat. Just tinker stuff.

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    what is your question?
    – jsotola
    Nov 9 '20 at 21:55
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    Welcome to the site! We are going to need more detail on your exact issue if we are going to help you. Please edit your question to specify exactly what research you have done so far and what the precise problem is that you are having. Thanks!
    – anonymous2
    Nov 9 '20 at 22:05
  • It won’t be that small, but there are PoE-powered Ethernet switches which can then themselves power other devices over PoE (search for “PoE switch passthrough”). Note that they will usually require PoE+ (802.3at) input and deliver PoE (802.3af) output. You could then connect your device to one of the ports.
    – jcaron
    Nov 10 '20 at 8:49

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