I’m trying to send and receive data from my laptop to arduino nano via hc05 Bluetooth for a rocket flight computer. For some reasons which I don’t know, I can send data from processing software using myPort.write() but cannot send a String back from arduino back to processing for telemetry purpose. At some point it was working, then stopped. I tried another code from HowToMechatronics.com and still it didn’t work. I’m using the Serial.println function on Hardware serial. Pls help

In the processing code, I use all necessary libraries and functions e.g serialEvent(), myPort.bufferUntil(\n), myPort.readStringUntil(‘\n’)