Not receiving nor sending

[xefiji]

Hi, great work! I enjoyed reading your code.

For some reason, i cannot manage to send/receive lora datas between a TBeam and a Lora32 Oled v2.
I posted an issue here: Xinyuan-LilyGO/LilyGo-LoRa-Series#18.

The receiver (lora32 oled) uses the sketch found here: https://randomnerdtutorials.com/ttgo-lora32-sx1276-arduino-ide/

The TBeam's code is below, and nothing is received on the lora32 (whereas, when i try with 2 lora32, one sender and one receiver, everything works perfectly fine).

My hypothesis are:
Am i missing something with Lora ? Two different devices cannot send/receive from each other ? Or is my code wrong somehow ? Or do i have a hardware problem ?

#include <Arduino.h>
#include <SPI.h>
#include <LoRa.h>         // https://github.com/sandeepmistry/arduino-LoRa/blob/master/API.md
#include "gps.h"
#include "TBeamPower.h"

TBeamPower power(PWRSDA, PWRSCL); //21 22

void setupSerial() { 
  Serial.println();
  power.print_wakeup_reason();
}

void setup() {

  Serial.begin(115200);
  while (!Serial);

  Serial.println("Power begin");
  power.begin();

  Serial.println("All sensors off");
  power.power_sensors(false);

  Serial.println("All peripherals off");
  power.power_peripherals(false);

  Serial.println("Powering LoRa");
  power.power_LoRa(true);

  SPI.begin(SCK,MISO,MOSI,SS); //5 19 27 18
  LoRa.setPins(SS,RST,DI0); //18 14 26

  if (!LoRa.begin(BAND)) { //868E6 (France)
    Serial.println("Starting LoRa failed!");
    while (1);
  }else{
    Serial.println("Starting LoRa succeed!");
  }

  Serial.println();
}

void loop() {
  power.led_onoff(true);
  delay(500);
  power.led_onoff(false);

  LoRa.beginPacket();
  LoRa.print("hello");  
  LoRa.endPacket();
  Serial.println("sent..");
  power.print_status();
  Serial.println();
  delay(2000);  
}

And here is the output i get

Power begin
AXP192 Begin PASS
All sensors off
All peripherals off
Powering LoRa
Starting LoRa succeed!

sent..
Voltages:
         DCDC1: 3.30v
         DCDC2: 1.25v
         DCDC3: 3.30v
         LDO2: 3.30v
         LDO3: 2.80v
ChargeCurrent:   0.70A
IPSOUTVoltage:   3.57v
Temp:            15.94°C
TSTemp:          800.00
VbusCurrent:     0.00
VbusVoltage:     0.00
Battery:
         Connected: false
         Charging:  false
         ChargEN :  true
         Voltage:   0.00v
         Inpower:   0.00
         DischgCur: 0.00
         ChargeCur: 0.00

I even tried to change the antenna.
I also tried to make the TBeam as receiver, and nothing arrived.