I've used my Due with the ethernet shield and a 10DOF board (I2C), a Adafruit Ultimate GPS (serial), and a 16 channel servo controller (I2C), and had no problems, even with UDP, which is my favorite protocol. Don't know what to tell you.
I've used my Due with the ethernet shield and a 10DOF board (I2C), a Adafruit Ultimate GPS (serial), and a 16 channel servo controller (I2C), and had no problems, even with UDP, which is my favorite protocol. Don't know what to tell you.