Ahoj,
I tried both examples in the imported state on my Nucleo-F767ZI and both working. I can click on the Toggle Led button many times without a crash.
Only in Bongjun’s example was nesery set correct eth interface for my board.
Of course with latest version of the Mbed OS it is not work because the examples are old more than year.
And also others are looking for the same thing Webserver with WebSockets für mbed-os5
Best regards, Jan