From @ibantxo on January 7, 2016 21:6

Hi,

I want that my code works in 3 cases:

1. Without ethernet shield connected to Arduino.
2. With ethernet shield, but unpluged cable
3. With ethernet shield with a working network

The third scenario works well. But the first one "hangs" in this code line (waiting forever...):
ethClient.connect(server, port);

Is there any way to detect presence of ethernet shield or to insert a timeout in connection attempt?

Many thanks

Iban

Copied from original issue: arduino/Arduino#4400