ScanNetworks.ino

/****************************************************************************************************************************
   ScanNetworks.ino - Simple Arduino web server sample for ESP8266/ESP32 AT-command shield
   For ESP8266 AT-command running shields

  ESP8266_AT_WebServer is a library for the ESP8266/ESP32 AT-command shields to run WebServer
  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Built by Khoi Hoang https://github.com/khoih-prog/ESP8266_AT_WebServer
  Licensed under MIT license
  
  Original author:
  @file       Esp8266WebServer.h
  @author     Ivan Grokhotkov
 *****************************************************************************************************************************/

// Credits of [Miguel Alexandre Wisintainer](https://github.com/tcpipchip) for this simple yet effective method
// For some STM32, there is only definition of Serial in variant.h, and is used for Serial/USB Debugging
// For example, in Nucleo-144 F767ZI original variant.h
//
// #define SERIAL_PORT_MONITOR     Serial
// #define SERIAL_PORT_HARDWARE    Serial
//
// To use ESP8266/ESP32-AT, we need another Serial, such as Serial1
// To do this, first, in corresponding variant.h, modify as follows:

// #define SERIAL_PORT_HARDWARE    Serial1
//
// then assign pins D0 = RX/D1 = TX to be Hardware Serial1 by putting in sketch as follows:
//
// #define EspSerial      SERIAL_PORT_HARDWARE    //Serial1
// HardwareSerial         Serial1(D0, D1);
//
// This must be included in defines.h for each board you'd like to use ESPSerial as Serial1
//
// The pin usage must be modified according to your boards.

#include "defines.h"

int status = WL_IDLE_STATUS;     // the Wifi radio's status
int reqCount = 0;                // number of requests received

void printMacAddress()
{
  // get your MAC address
  byte mac[6];
  WiFi.macAddress(mac);

  // print MAC address
  char buf[20];
  
  sprintf_P(buf, PSTR( "%02X:%02X:%02X:%02X:%02X:%02X"), mac[5], mac[4], mac[3], mac[2], mac[1], mac[0]);
  Serial.print(F("MAC address: "));
  Serial.println(buf);
}

void listNetworks()
{
  // scan for nearby networks
  int numSsid = WiFi.scanNetworks();

  if (numSsid == -1)
  {
    Serial.println(F("Couldn't get a wifi connection"));
    while (true);
  }

  // print the list of networks seen
  Serial.print(F("Number of available networks:"));
  Serial.println(numSsid);

  // print the network number and name for each network found
  for (int thisNet = 0; thisNet < numSsid; thisNet++) 
  {
    Serial.print(thisNet);
    Serial.print(F(") "));
    Serial.print(WiFi.SSID(thisNet));
    Serial.print(F("\tSignal: "));
    Serial.print(WiFi.RSSI(thisNet));
    Serial.print(F(" dBm"));
    Serial.print(F("\tEncryption: "));
    printEncryptionType(WiFi.encryptionType(thisNet));
  }
}

void printEncryptionType(int thisType)
{
  // read the encryption type and print out the name
  switch (thisType)
  {
    case ENC_TYPE_WEP:
      Serial.print(F("WEP"));
      break;
    case ENC_TYPE_WPA_PSK:
      Serial.print(F("WPA_PSK"));
      break;
    case ENC_TYPE_WPA2_PSK:
      Serial.print(F("WPA2_PSK"));
      break;
    case ENC_TYPE_WPA_WPA2_PSK:
      Serial.print(F("WPA_WPA2_PSK"));
      break;
    case ENC_TYPE_NONE:
      Serial.print(F("None"));
      break;
  }
  Serial.println();
}

void setup()
{
  Serial.begin(115200);
  while (!Serial && millis() < 5000);

  Serial.print(F("\nStarting ScanNetworks on ")); Serial.print(BOARD_NAME);
  Serial.print(F(" with ")); Serial.println(SHIELD_TYPE); 
  Serial.println(ESP8266_AT_WEBSERVER_VERSION);

  // initialize serial for ESP module
  EspSerial.begin(115200);
  // initialize ESP module
  WiFi.init(&EspSerial);

  Serial.println(F("WiFi shield init done"));

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

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

  Serial.print(F("You're connected to the network, IP = "));
  Serial.println(WiFi.localIP());

  // Print WiFi MAC address
  printMacAddress();
}

void loop()
{
  // scan for existing networks
  Serial.println();
  Serial.println(F("Scanning available networks..."));
  listNetworks();
  delay(10000);
}