STM32 HAL_UART Lora communication - c

Question

I have 2 LoRa modules. I want to use one of them as receiver and the other one as transmitter. I can do this with 2 Arduino Unos, but I want to use one STM32 board as transmitter and Arduino Uno board as receiver. I am using an Ebyte LoRa module, E32433T20D.
I set the receiver like this :
{0x00, 0x01, 0x1A, 0x17, 0xC0} ;
Here is my Arduino transmitter code.
#define PIN_SERIAL1_TX (0u)
#define PIN_SERIAL1_RX (1u)
#define M0 14
#define M1 15
void setup() {
pinMode(M0, OUTPUT);
pinMode(M1, OUTPUT);
digitalWrite(M0, LOW);
digitalWrite(M1, LOW);
Serial1.begin(9600); // UART initialize I am using RP2040 with Arduino code
}
void loop() {
Serial1.write((byte)0x00); // Receiver address
Serial1.write(0x01); // Receiver address
Serial1.write(0x17); // Receiver channel = 0x17 = 23 (410M+23=433 MHz)
Serial1.println("123");
delay(500);
}
This code can transmit "123" without any problem. When I try this in C:
#include "main.h"
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void); //debug
static void MX_USART1_UART_Init(void); //Lora
/* USER CODE BEGIN 0 */
uint16_t readValue;
uint8_t charToTransmit[1];
/* USER CODE END 0 */
int main(void) {
HAL_Init();
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init(); //DEBUG
MX_USART1_UART_Init();
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_5,0); //M0
HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,0); //M1
HAL_Delay(100);
uint8_t config[]= {0x00,0x01,0x1A,0X17,0XC0};
/* USER CODE BEGIN WHILE */
while (1) {
charToTransmit[0] = 1 ;
HAL_UART_Transmit(&huart1,config,sizeof(config),0);
HAL_Delay(500);
HAL_UART_Transmit(&huart1,charToTransmit,1,100);
HAL_Delay(500);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
// There is HAL library initialization over here
This code is not transmitting or my receiver is not receiving, I don't know, but I can't see "1" on my receiver. Since I am a beginner in C, is my UART protocol wrong or something?
Here is my receiver program, I wrote it in the Arduino IDE too.
#include <Arduino.h>
#define PIN_SERIAL1_TX (0u)
#define PIN_SERIAL1_RX (1u)
#define M0 14
#define M1 15
char rc;
void setup() {
Serial.begin(115200);
Serial1.begin(9600);
pinMode(M0, OUTPUT);
pinMode(M1, OUTPUT);
digitalWrite(M0, LOW);
digitalWrite(M1, LOW);
}
void loop() {
while (Serial1.available()) {
rc=Serial1.read();
Serial.print(rc);
}
}