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Remove the header jumpers from the TX/RX pins Jumper WIFI_TX to Mage Pin 10 (black wire in photo) Jumper WIFI_RX to Mega Pin 11 (yellow wirein photo) Alter the definition of WiFly class for pins 10,11: WiflyClass Wifly(10,11);
The WiFly device is now pingable. I have some garbage in my serial port monitor, but those characters are the "connection refused" TCPIP packet returned from the computer I am connecting to. Now I can get to work on a communication protocol between the Mega and other computers.