How to make a LoRaWAN Arduino Robot

#include <SPI.h>
#include <LoRa.h>
const int RightMotorF= 4;
const int RightMotorB= 5;
const int LeftMotorF= 6;
const int LeftMotorB= 7;
String  msg="";

void setup() {
  pinMode(RightMotorF,OUTPUT);
  pinMode(RightMotorB,OUTPUT);
  pinMode(LeftMotorF,OUTPUT);
  pinMode(LeftMotorB,OUTPUT);
  Serial.begin(9600);
  while (!Serial);

  Serial.println("LoRa Receiver");

  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

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

    // read packet
    while (LoRa.available()) {
     // Serial.print((char)LoRa.read());
      msg=(char)LoRa.read();
     Serial.println(msg);
      if(msg=="u")
    {
  digitalWrite(RightMotorB,LOW);
  digitalWrite(LeftMotorB,LOW);
  digitalWrite(RightMotorF,HIGH);
  digitalWrite(LeftMotorF,HIGH);

  Serial.println("Motor forward");
  }
  else if(msg=="d")
  {
  digitalWrite(RightMotorB,HIGH);
  digitalWrite(LeftMotorB,HIGH);
  digitalWrite(RightMotorF,LOW);
  digitalWrite(LeftMotorF,LOW);
  
  Serial.println("Motor Back");
  }
   else if(msg=="l")
  {
  digitalWrite(RightMotorB,LOW);
  digitalWrite(LeftMotorB,HIGH);
  digitalWrite(RightMotorF,HIGH);
  digitalWrite(LeftMotorF,LOW);
  Serial.println("Left");
  delay(300);
  digitalWrite(RightMotorB,LOW);
  digitalWrite(LeftMotorB,LOW);
  digitalWrite(RightMotorF,LOW);
  digitalWrite(LeftMotorF,LOW);
  }
   else if(msg=="r")
  {
  digitalWrite(RightMotorB,HIGH);
  digitalWrite(LeftMotorB,LOW);
  digitalWrite(RightMotorF,LOW);
  digitalWrite(LeftMotorF,HIGH);
  Serial.println("right");
  delay(300);
  digitalWrite(RightMotorB,LOW);
  digitalWrite(LeftMotorB,LOW);
  digitalWrite(RightMotorF,LOW);
  digitalWrite(LeftMotorF,LOW);
  }
 }

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

#include <SPI.h>
#include <LoRa.h>

int counter = 0;
int up_button     = 4; // UP
int down_button   = 5; // Down
int left_button   = 6; // LEFT
int right_button  = 7; // RIGHT
int buttons[]={up_button, down_button,left_button,
               right_button};

void setup() {
  Serial.begin(9600);
  for(int i; i <4 ; i++)
     {
         pinMode(buttons[i],INPUT);
         digitalWrite(buttons[i],HIGH);  
     } 

   
  while (!Serial);

  Serial.println("LoRa Sender");

  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  LoRa.setTxPower(20);
  
}

void loop() {
  //Serial.println("Sending packet: ");
 // Serial.println(counter);

  // send packet
//  LoRa.beginPacket();
 // LoRa.print("hello ");
 // LoRa.print(counter);
  if(digitalRead(up_button)==LOW)
      {
      LoRa.beginPacket();
      LoRa.print("u");
      Serial.println("UP Button Pressed");
      delay(300);
      LoRa.endPacket();
        
      }
   else if(digitalRead(down_button)==LOW)
      {
      LoRa.beginPacket();
      LoRa.print("d");
      Serial.println("down Button Pressed");
      delay(300);
      LoRa.endPacket();  
      }
         else if(digitalRead(left_button)==LOW)
      {
        LoRa.beginPacket();
      LoRa.print("l");
      Serial.println("left Button Pressed");
      delay(300);
      LoRa.endPacket();
        
      }
         else if(digitalRead(right_button)==LOW)
      {
        LoRa.beginPacket();
      LoRa.print("r");
      Serial.println("right Button Pressed");
      delay(300);
      LoRa.endPacket();
        
      }
      //delay(1000);
 // Serial.println("waiting....");
 // LoRa.endPacket();

  counter++;

 // delay(5000);
}