Computer can send data to Arduino without serial monitor but arduino won't send

Projects Interfacing w/ Software on the Computer
2

Today at 07:58 pm
So I wrote a program on my computer to talk to the program I wrote on my Arduino Esplora over serial,

The Esplora is based on the Leonardo, and serial communications with the Leonardo can be confusing.

I think the answer is found in this thread after reply #5.

http://forum.arduino.cc/index.php?topic=143028.0

The Leonardo requires that DtrEnable be set when opening the serial connection (on the PC end). The Serial Monitor does that. Most PC applications do not