ios-posix-connect
This app tests the time to establish a posix tcp connection and do a HTTP request/response cycle on iOS devices.
When the button is tapped, a C function is called that establishes a tcp connection to a web server in Sweden. The C function sends an HTTP request, and waits for the response. The response is compared with the expected result which is just HTTP 400.
If everything is okay, the C function returns 0.
The C functions only uses Posix calls.
Swift code handles the tap of the button and measures the time to complete the C function.
The resulting duration, in seconds, is printed in a label.