(I use ESP32 dev kits with Arduino api.)

My dev kit 1 is running my firmware; and I want to measure the current it draws, therefore I don't like to plug the USB in.

As I need to read the logs from the dev kit 1, I want to plug another dev kit that collects the log from the first through the UART.

The dev kit 1 firmware is as it is, but on the dev kit 2, I wrote such a thing:

#include <Arduino.h>
#include <Hardware.h>

HardwareSerial Reader();

void setup() {
    Serial.begin(115200);
    Reader.begin(115200, SERIAL_8N1, 16, 17); 

}

void loop() {
    while(Reader.available()) { 
        Serial.print(Reader.read());
    }
}

The wiring is as follows:

But this doesn't work, that is I can't see anything on the dev kit 2 serial on my computer. Any idea?

(I use ESP32 dev kits with Arduino api.)

My dev kit 1 is running my firmware; and I want to measure the current it draws, therefore I don't like to plug the USB in.

As I need to read the logs from the dev kit 1, I want to plug another dev kit that collects the log from the first through the UART.

The dev kit 1 firmware is as it is, but on the dev kit 2, I wrote such a thing:

#include <Arduino.h>
#include <Hardware.h>

HardwareSerial Reader();

void setup() {
    Serial.begin(115200);
    Reader.begin(115200, SERIAL_8N1, 16, 17); 

}

void loop() {
    while(Reader.available()) { 
        Serial.print(Reader.read());
    }
}

The wiring is as follows:

But this doesn't work, that is I can't see anything on the dev kit 2 serial on my computer. Any idea?

[UPDATE] As suggested by @juraj, I simply wire TX to TX, RX to RX and GND to GND and removed the Serial.begin(115200) from the firmware running on dev kit 1. Dev kit 2 firmware is as simple as:

void setup() {
  Serial.begin(115200);
  //Serial.printf("Serial2 logger RX (%d)<=>TX & TX(%d)<=>RX @ 115200 bauds", RX, TX); Serial.println();
}

void loop() {
  static unsigned lastHeartbeat = 0;

  const unsigned now =millis();
  if (now-lastHeartbeat > 4000) {
    lastHeartbeat = now;
    Serial.println("Heartbeat");
  }
}

Note that on dev kit 1, I commented out the line Serial.begin(115200).

No kit 1 logs appears on my computer.

The wiring of this setup:

(I use ESP32 dev kits with Arduino api.)

My dev kit 1 is running my firmware; and I want to measure the current it draws, therefore I don't like to plug the USB in.

As I need to read the logs from the dev kit 1, I want to plug another dev kit that collects the log from the first through the UART.

The dev kit 1 firmware is as it is, but on the dev kit 2, I wrote such a thing:

#include <Arduino.h>
#include <Hardware.h>

HardwareSerial Reader();

void setup() {
    Serial.begin(115200);
    Reader.begin(115200, SERIAL_8N1, 16, 17); 

}

void loop() {
    while(Reader.available()) { 
        Serial.print(Reader.read());
    }
}

The wiring is as follows:

But this doesn't work. Any idea?

(I use ESP32 dev kits with Arduino api.)

My dev kit 1 is running my firmware; and I want to measure the current it draws, therefore I don't like to plug the USB in.

As I need to read the logs from the dev kit 1, I want to plug another dev kit that collects the log from the first through the UART.

The dev kit 1 firmware is as it is, but on the dev kit 2, I wrote such a thing:

#include <Arduino.h>
#include <Hardware.h>

HardwareSerial Reader();

void setup() {
    Serial.begin(115200);
    Reader.begin(115200, SERIAL_8N1, 16, 17); 

}

void loop() {
    while(Reader.available()) { 
        Serial.print(Reader.read());
    }
}

The wiring is as follows:

But this doesn't work, that is I can't see anything on the dev kit 2 serial on my computer. Any idea?