Printing transmitted LoRa String to LCD screen

Using Arduino Project Guidance
1

Hey all, I'm attempting to display some data (a string) I receive from my Dragino LoRa Shield on my ST7920 LCD screen but I'm having some trouble. Microcontroller used is an ESP-32 Devkitc V4.

The LCD screen uses the U8g2 library for all its graphical capabilities and I've read on other posts that it is a pain to get it to print string variables. I've gotten int and float variables to print, but not a string. Is there something in the LoRa.h or U8g2lib.h libraries to work around this?

Furthermore, I get a error:

90 |   u8g2.drawString(0, 50, LoRaData); //write String from LoRa
   |                        ^~~~~~~~

exit status 1

Compilation error: 'LoRaData' was not declared in this scope

Here is my code so far anyway:

#include <U8g2lib.h>
#include <LoRa.h>

//Define which LCD module we are using and the respective pins
U8G2_ST7920_128X64_F_SW_SPI u8g2(U8G2_R0, /* clock=*/ 17, /* data=*/ 4, /* CS=*/ 15, /* reset=*/ 22); // ESP32 defaults are 18, 23, 5, arbitrary 22

// Statements to determine if LCD is running in I2C or SPI mode
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

//define the pins used by the transceiver module
#define cs 5
#define rst 14
#define dio0 2

//#define LCD_CS 16
#define LORA_CS 5

//LCD HSPI pins
#define HSPI_SCK 17
#define HSPI_MISO 16
#define HSPI_MOSI 4
#define LCD_SS 15

SPIClass *hspi = NULL;

String name = "Garbage"; //in SRAM

void setup(void) {
  // Enbale LCD functions

  hspi = new SPIClass(HSPI);

  hspi->begin(HSPI_SCK, HSPI_MISO, HSPI_MOSI, LCD_SS);
  pinMode(hspi->pinSS(), OUTPUT);
  u8g2.begin();
  u8g2.enableUTF8Print();		// enable UTF8 support for the Arduino print() function

    //initialize Serial Monitor
  Serial.begin(115200);
  while (!Serial);
  Serial.println("LoRa Receiver");

  //setup LoRa transceiver module
  LoRa.setPins(cs, rst, dio0);
  
  //replace the LoRa.begin(---E-) argument with your location's frequency 
  while (!LoRa.begin(915E6)) {
    Serial.println(".");
    delay(500);
  }
   // Change sync word (0xF3) to match the receiver
  // The sync word assures you don't get LoRa messages from other LoRa transceivers
  // ranges from 0-0xFF
  LoRa.setSyncWord(0xF3);
  Serial.println("LoRa Initializing OK!");
}

void loop(void) {

  // try to parse packet
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    // received a packet
    Serial.print("Received packet '");

    // read packet
    while (LoRa.available()) {
      String LoRaData = LoRa.readString();
      Serial.print(LoRaData); 
    }

    // print RSSI of packet
    Serial.print("' with RSSI ");
    Serial.println(LoRa.packetRssi());
  }

  digitalWrite(hspi->pinSS(), LOW); //enable to write
  // Display Data recieved via LoRa
  u8g2.setFont(u8g2_font_unifont_t_chinese2);  // use chinese2 for all the glyphs of "你好世界"
  u8g2.setFontDirection(0);
  u8g2.clearBuffer();
  u8g2.setCursor(0, 15);
  u8g2.print("Hello");
  u8g2.drawUTF8(0, 50, LoRaData); //write String 
  u8g2.sendBuffer();
  digitalWrite(hspi->pinSS(), HIGH); //disable 

  delay(1000);
}
2

The String LoRaData is a local variable that does not exist outside of the while statement.

drawUTF8() takes a c-string, not a String. Try using LoRaData.c_str().