这是什么问题呢？新手，不是很了解。有大神能解释一下吗

#include "WiFiEsp.h"

// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(6, 7); // RX, TX
#endif

char ssid[] = "淑芳斋";            // your network SSID (name)
char pass[] = "201912210418@";        // your network password
int status = WL_IDLE_STATUS;     // the Wifi radio's status

void setup()
{
  // initialize serial for debugging
  Serial.begin(9600);
  // initialize serial for ESP module
  Serial1.begin(115200);
  // initialize ESP module
  WiFi.init(&Serial1);

  // check for the presence of the shield
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue
    while (true);
  }

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to WPA SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);
  }

  Serial.println("You're connected to the network");
}

void loop()
{
  // print the network connection information every 10 seconds
  Serial.println();
  printCurrentNet();
  printWifiData();
  
  delay(10000);
}

void printWifiData()
{
  // print your WiFi shield's IP address
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print your MAC address
  byte mac[6];
  WiFi.macAddress(mac);
  char buf[20];
  sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X", mac[5], mac[4], mac[3], mac[2], mac[1], mac[0]);
  Serial.print("MAC address: ");
  Serial.println(buf);
}

void printCurrentNet()
{
  // print the SSID of the network you're attached to
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print the MAC address of the router you're attached to
  byte bssid[6];
  WiFi.BSSID(bssid);
  char buf[20];
  sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X", bssid[5], bssid[4], bssid[3], bssid[2], bssid[1], bssid[0]);
  Serial.print("BSSID: ");
  Serial.println(buf);

  // print the received signal strength
  long rssi = WiFi.RSSI();
  Serial.print("Signal strength (RSSI): ");
  Serial.println(rssi);
}

mqtt_uno_8266_2:6:23: error: conflicting declaration 'SoftwareSerial Serial1'
In file included from C:\Users\˫˫\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266/Arduino.h:245:0,
from C:\Users\˫˫\AppData\Local\Temp\arduino_build_770474\sketch\mqtt_uno_8266_2.ino.cpp:1:
C:\Users\˫˫\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266/HardwareSerial.h:208:23: error: 'Serial1' has a previous declaration as 'HardwareSerial Serial1'
extern HardwareSerial Serial1;
^

exit status 1
conflicting declaration 'SoftwareSerial Serial1'

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