Trying out and experimenting with the Cayenne IoT Platform is still possible, even with the absence of a WiFi shield or an ethernet shield. Beginners should actually find this useful.
Thanks for the writeup on USB Serial connectivity with Cayenne @ebtenorio!
One thing I’ll add to the discussion: you might notice when you try the USB serial connection, you can no longer debug using the Serial Monitor in the Arduino IDE – because the serial port is occupied. However, you can work around this by using the SoftwareSerial library to facilitate debugging while you’re on a USB Serial connection.