The common ground for SIM and ESP cleared the situation. Now it is working....

I have an other question related to this.... how to use Data only USB-cable between ESP - WIN (data, and ground connected.)

The ground didn't help.

I'm looking solution for data only USB-cable for ESP32 <-> WIN10.

I made cable where only data (white& green) are connected. Unfortunately it seems that Windows is not finding the USB-port with this cable when the board is power from other source.

Is there away to connect to board with data only ...

I hope that some of you can give some advices for me.

The problem is that I'm not get any reasonable replies back to ESP from SIM800L module

//#define TINY_GSM_MODEM_SIM7080
#define TINY_GSM_MODEM_SIM800


#include <HardwareSerial.h>
#include <TinyGsmClient.h>

#define SerialMon Serial ...