Detect if serial cable is connected

Hi

I wrote this code to try to detect if serial cable is connected, it did not work, any idea if this is possible?

Idea behind this is that I program a macro that disables serial print to save power, but If I connect a computer then serial print macro starts to send debug info to serial.

MCU ESP32 wroom bare bone, with an external programmer

void setup() {
  Serial.begin(115200);
  // delay(50);

  if (Serial.available() > 0) {
    Serial.print("Seriell kabel IS connected, sWrite settes til 1 (true)");
    // sWrite = 1
  } else {
    Serial.print("Seriell kabel NOT connect, sWrite settes til 0 (false)");
    // sWrite = 0
  }

Serial Output (cable obviously connected):

Seriell kabel NOT connect, sWrite settes til 0 (false)

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