Having a new new Sigfox click module you have to know its Sigfox ID in order to be able to register your new device. This example alows you to retrieve the Sigfox ID, print it out to serial port and show it directly on the display (=no need to launch serial monitor).
It expects you have the following equipment:
NXP Rapid IoT Development kit
Sigfox click module (EU version is used in this example – plugged in slot #3)