I copied over the initial sketch “Cayenne Ethernet Example” and tried to compile it. Got the following error messages:
Arduino: 1.6.5 (Windows 7), Board: “Arduino Uno”
In file included from D:\Documents\Arduino\libraries\Cayenne/CayenneEthernet.h:24:0,
D:\Documents\Arduino\libraries\Cayenne/BlynkSimpleEthernet.h:18:22: fatal error: Ethernet.h: No such file or directory
I have a working Arduino with a good Internet connection. I verified that the Ethernet.h file is in the C:\Program Files (x86)\Arduino\libraries\Ethernet\src directory.
I tried copying the Ethernet.h file over to the Cayenne library directory.
The sketch that is currently running in the Arduino uses Ethernet.h and works fine.