Android: Problem starting the program from the shell

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Tries to run the "/ data / local / tmp / iperf" program from the android application. unfortunately the program returns a "no permissions" error.

  Java.Lang.Process processa = Java.Lang.Runtime.GetRuntime().Exec("/data/local/tmp/iperf -v");
                Java.IO.BufferedReader inas = new Java.IO.BufferedReader(new Java.IO.InputStreamReader(processa.InputStream));
                using (var outputStreamReader = new StreamReader(processa.InputStream))
                    textMessage.Text = await outputStreamReader.ReadToEndAsync();
****Error: Java.IO.IOException: 'Cannot run program "/data/local/tmp/iperf": error=13, Permission denied'****
Running from adb shell works
adb shell /data/local/tmp/iperf -v
iperf version 2.0.5 (08 Jul 2010) pthreads
How to run such an Android application correctly?
						I find solution, API29+ have more "feature": Removed execute permission for app home directory     
The workaround is to rename the executable from "iperf" to "libiperf.so", and create "lib" directory, make "arm64-v8a" subdirectory and put "libiperf.so" there.    
Then you can execute iperf    
Java.Lang.Process processIperf = Java.Lang.Runtime.GetRuntime().Exec(ApplicationInfo.NativeLibraryDir + "/libiperf.so -v");  
Java.IO.BufferedReader bufferedReader = new Java.IO.BufferedReader(new Java.IO.InputStreamReader(processIperf.InputStream));  
For more details and discussions, please go to the internet. No decent solution, there are only more workarounds;)