According to #3786 removed the reference to Leonardo only in while(!Serial) of the examples.
Changed in in "wait for serial port to connect. Needed for native USB port only"
Set the DNS-Server as third parameter of Ethernet.begin if at least gateway is specified. Reference is Updated before.
In BarometricPressureWebServer gateway and subnet wasn't used.
Signed-off-by: Eddy <est.git@online.de>