Yes what Bushman said. In my case I have an Acurite station and use the SmartHub. It connects to the DIR-505 through the Ethernet port. The SmartHub normally plugs directly into the internet and sends data only to Acurite which in turn can send it to WU, but not in a rapidfire format. With the Meteobridge in there in-between it sniffs out the data and sends it where I direct it to go and also allows it to pass through to Acurite servers so I can still use the app from them as well. It also uploads data to WU at a interval selected by me (I think I'm set at every 5 seconds right now) and also uploads to the other services I choose at intervals set by me.
Acurite recently changed the upload interval to WU from their site to once every 5 minutes. Prior I think it was once every 15 or 20? I didn't want to deal with that so I researched this option and have been happy.
The DIR-505 when flashed with the Meteobridge software connects to the internet wirelessly on my home network. Previously I was at the mercy of where I had an available ethernet port to plug in the receiver for my station, but since the DIR is on my WiFi, I can place it wherever I get the best reception from outside for my station.