Serial.read() gives null value from Arduino and or the port is not open on processing side

Processing Electronics (Arduino, etc.)
4

Actually this is important. This line is in the global scope. You should do instead

Serial myPort;

void setup(){
   myPort = new Serial(this, Serial.list()[0], 9600);
   ....

}

At the end of setup() you should add a delay of 500 or 1000 ms as some units seem to go into a reset cycle. This delay will ensure the unit is ready. However, I am not sure if this applies in your case. Just add delay(1000);.

Kf

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