Tethering: MacOS 11.x/iOS 14.x devices are not found with TTetheringManager.DiscoverManagers

[philipp.hofmann 4]

Hi,

even after adding the new Apple Multicast-Entitlement it's not possible to use Tethering with MacOS 11.x and iOS 14.x devices on server side. This devices will not be found with the method 
TTetheringManager.DiscoverManagers
requested on client side.

It's fine with MacOS 10.x and iOS 13.x devices on server side. 

You can test this also with the samples
- DesktopWallApp (server)
- MobilePhotoApp (client)

 

DesktopWallApp	Windows	Android	MacOS 10.x	iOS 13.x	MacOS 11.x	iOS 14.x
MobilePhotoApp
Windows	OK	OK	OK	OK	not OK	not OK
Android	OK	OK	OK	OK	not OK	not OK
MacOS 10.x	OK	OK	OK	OK	not OK	not OK
iOS 13.x	OK	OK	OK	OK	not OK	not OK
MacOS 11.x	OK	OK	OK	OK	not OK	not OK
iOS 14.x	OK	OK	OK	OK	not OK	not OK

 

The reason is that the method
TTetheringNetworkManagerCommunicationThread.DoOnReceiveData
is never reached with this OS versions.

This problem crops the usage of Tethering as the biggest part of MacOS/iOS devices are running with the newest OS-version. So Tethering is usable for Windows and Android only.

 

Do anybody knows a solution for this.

 

Best regards, Philipp

 

Activity

[FabDev 8]

Hello Philipp,

 

I confirm for IOS 14 with Delphi 10.4.2.

But it's work fine with MacOS Big Sur 11.4 (Mac Mini  Intel 2014).

It's even work from my VMware Windows 10, where is my Delphi 10.4.2, connected to my Mac Mini.

My Mac Mini and my PC are connected throw Ethernet. I don't test connected via WIFI.

 

So It's work in every direction :

DesktopWallApp (MacOs 11.4 or Windows 10)

MobilePhotoApp (MacOs 11.4 or Windows 10)

 

I use it every day because I have developed my own Clipboard Sharing based on apptethering between my PC, Mac, Android. But it's only fail (no client/server detected) on IOS 14...

 

[philipp.hofmann 4]

The question for me is now, why it works with your MacOS Big Sur? Is it a different setting for the Mac or a different setting in the provision profile?

Can you see that the method
TTetheringNetworkManagerCommunicationThread.DoOnReceiveData

reached if you start the app on MacOS, equal if DesktopWWallApp or MobilePhotoApp?

[philipp.hofmann 4]

Since today it's running fine on my side for MacOS Big Sur 11.4 and iOS 14.6. The only thing I have updated this week was XCode.

Attached you find all Tethering fixes I have done in my enviroment.

TetheringPatches_Delphi_10.4.2.zip

[FabDev 8]

Hello Philipp,

 

Tested on IOS 14.6 with Delphi SDK updated it's style not work.

Sorry but tested with your patch and it's worst because program crash at start in a access violation at 0000000104A0014 at adresse FFFFFFFFFFFFFFF78" in line :

 procedure TTetheringNetworkServerCommUDP.BroadcastData(const AData: TBytes; const AHost: string;
  InitialPort, FinalPort: Integer);
.../...    
   FUDPServer.Bindings.Sockets[J].Broadcast(LData, I, LHost);

 

Before exception local values :

 

InitialPort = 2020

FinalPort = 2039

LHost ='255.255.255.255'

LData = 0x0000000282a00a30 "TetheringNewManager|192.168.1.56$2020|1|{4A03A28F-86DA-EB11-A88B-A1727F35E082}|TakePhotoManager|TakePhotoManager|2020~"

 

 

Edited July 1, 2021 by FabDev
Add line error

[philipp.hofmann 4]

If there is an access violation at this line, the binding was not successful before.

 

a) Is the IP-address 192.168.1.56 correct for your test? This is the only relevant change by my patches.

b) Did your App has the permission to access local network in iOS settings?

c) Did your Provision profile has the new permission "com.apple.developer.networking.multicast"?
    https://developer.apple.com/contact/request/networking-multicast

On my devices (I've tested with three iOS devices), it works fine (with and without mobile data).

Edited July 2, 2021 by philipp.hofmann

[philipp.hofmann 4]

I have found now the reason: 
- as long as I have a iPad connected to my MacBook via USB-C-Cable, I can't establish a Tethering connection (means I can't discover the iPad and I can't discover the MacOS device)

- as soon as I remove the cable, I can establish a Tethering connection and can discover both devices

[FabDev 8]

In most case (to not kill the battery of my Iphone there is no problem for Ipad) I debug via WIFI and it's work fine (compilation/installation/debug not Tethering). But I have tested with USB cable without change.

Edited July 13, 2021 by FabDev