I am having issues with a new R-Pi 3 running the new Jessie 2.15 image. It came up OK on Ethernet, and I let it sit there for a couple of days to get a baseline feel for air traffic. I then enabled WiFi by editing the wpa_supplicant file, and got an IP address for wlan0 – all good so far. After less than a day, I realize it is offline and producing no data, so I have re-connected it to Ethernet.
Now I have two questions:  how do I set i up to reconnect if it loses WIFI? I’ve seen a post directing a user to here [flightaware.com/adsb/piaware/build/optional#wifi], but see no instructions on how do set up WIFI reconnect. Maybe the page has been changed recently… Any suggestions on how to do this?
 While plugged into the Ethernet, I am now getting two IP addresses. I can see the same aircraft plotting on both pages locally… I would prefer to have the WIFI turn on only if eht0 is not connected – is there a way to do that?
FWIW, this does not appear to be a network issue, as other computers are working fine, including my other Piaware server [R-Pi2, WiFi only], which has sat there delivering data consistently through all this.