iPad Air 2 / iOS 10 lease detection issue

[cyoung]

1. Stratux version: v1.0r1

2. Stratux config:

   SDR

   • single
   • dual

   GPS

   • yes
   • no
     type:

   AHRS

   • yes
   • no

   power source: ?

   usb cable: ?

3. EFB app and version: N/A

   EFB platform: iOS 10

   EFB hardware: iPad Air 2

4. Description of your issue:

User reports that his Stratux build works fine on an old iPad, but a brand new iPad Air 2 doesn't show Stratux in the "Devices" list on FF.

User sent screenshots showing "Recent Clients: 0" from the iPad.

[cyoung]

Issue wasn't related to the iPad.
Old iPad was working but new one wasn't. Old iPad was in DHCP lease file, new one wasn't. SD card had a write issue, so Stratux wasn't picking up the new DHCP lease. Need a UI error thrown when /var/lib/dhcp/dhcpd.leases is not writeable.

[emuyshondt]

Here's what happened to me. I'm running an iPad Air 2 with the latest ForeFlight. I upgraded to iOS10, and I think also to the latest version of FF since I last used my FlightBox. I have the latest released versions of both iOS10 and FF. I have been using my iPad with Stratux and FF for months. It worked before the latest software upgrades without issue.

I finally got to fly yesterday and connect to my ADS-B receiver. I had seen this issue report. When I first started up my iPad, I verified it was connected to the FlightBox (stratux derivative) WiFi network by looking at the iPad/iOS settings. I then went to the FF page described above and had the exact same symptom. I clicked on the small "i" on the upper right hand corner and it showed the Stratux WiFi network. I tapped on that line, and then I got the message that shows something about ADS-B device connected. Everything worked as expected after that.

Now I don't know if this is a Stratux, FF or iOS 10 issue, since I updated both iOS and FF since I last used my setup.

[cyoung]

@emuyshondt - Try disabling Bluetooth and see if it has any effect.

[emuyshondt]

I didn't think to check if the problem re-occurred after the system started
working. I just flew and enjoyed having traffic information (two planes I
would have never seen without Straux within half a mile!). Unfortunately,
the Pi I have with me seems to be having problems, so I can't check until I
get to my plane again.

Now I'm going to be away from my plane and Stratux until the end of
October. If I get a chance, I'll try to go by the airport before I leave on
Thursday to try some experiments.

On Mon, Oct 3, 2016 at 9:59 AM, cyoung notifications@github.com wrote:

@emuyshondt https://github.com/emuyshondt - Try disabling Bluetooth and
see if it has any effect.

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[cyoung]

SD card had a write issue, so Stratux wasn't picking up the new DHCP lease.

Solution was to replace SD card.