MPCF behaves wrong on iOS 10

[dersim-davaod]

No description provided.

[dersim-davaod]

For now looks like Multipeer Connectivity in iOS 10 is a bag of hurt.

For now we have following scenarios:
The invitation is sent and accepted, the connection state changes to connecting and then to not connected after about 10 seconds later. Right after changing the state to connecting a
[ViceroyTrace] [ICE][ERROR] ICEStopConnectivityCheck() found no ICE check with call id (108154439)
error is thrown.

I did some testing with two iOS 10.3 devices: it seems that on iOS 10, wifi-only multipeer is broken. It seems like it will only work if wifi is turned off AND BT is turned on (Crazy!). Some guys in the web confirmed that.
If I'm trying to establish connection, wifi-only device is discovered, followed by a dozen
[ViceroyTrace] [ICE][ERROR] Send BINDING_REQUEST failed(C01A0041).
errors and a connection state changes to not connected sometimes.

So it seems really unstable and I get errors like yours. Most of the time it only works the first time the app is launched after being built to a device, or under certain combinations of bluetooth and wifi.

There are some bugs (rdar://28388060, https://openradar.appspot.com/27243227) with Apple.
The bug is readily reproducible with Apple's MultipeerGroupChat sample app.
Also mailing list contains similar bug: https://lists.apple.com/archives/cocoa-dev/2016/Sep/msg00455.html
And as I said also we've run into the logs from ViceroyTrace that is similar to https://forums.developer.apple.com/thread/52289

Unfortunately no response from Apple Support in almost a month past now on developer forums.

So we continue investigation of this issue, because there is a probability that we missed something.
Also I found that IPv4 using might be the reason. We're trying to use IPv6 only for connecting.

[dersim-davaod]

Also I want to play with encryptionPreference in MCSession object.

[strangfeld]

hey @dersim-davaod , is there any further update on this ? I'm lost on the same journey :(

[Ayyanchira]

How come it is possible that a project was working very well a month back.
I was working on a poc where I had this framework established. I had the code committed when everything was working properly. Now that I wanted to continue on that, and I took the code from github, its throwing that error.

And if there was a bug last year, how was I able to make the POC run properly a month ago?

Badly confused!!