Scan Networks

/*

 This example  prints the WiFi shield's MAC address, and

 scans for available WiFi networks using the WiFi shield.

 Every ten seconds, it scans again. It doesn't actually

 connect to any network, so no encryption scheme is specified.

 Circuit:

 * WiFi shield attached

 created 13 July 2010

 by dlf (Metodo2 srl)

 modified 21 Junn 2012

 by Tom Igoe and Jaymes Dec

 */

#include <SPI.h>
#include <WiFi101.h>

void setup() {

  //Initialize serial and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  // check for the presence of the shield:

  if (WiFi.status() == WL_NO_SHIELD) {

    Serial.println("WiFi shield not present");

    // don't continue:

    while (true);

  }

  // Print WiFi MAC address:

  printMacAddress();

  // scan for existing networks:

  Serial.println("Scanning available networks...");

  listNetworks();
}

void loop() {

  delay(10000);

  // scan for existing networks:

  Serial.println("Scanning available networks...");

  listNetworks();
}

void printMacAddress() {

  // the MAC address of your WiFi shield

  byte mac[6];

  // print your MAC address:

  WiFi.macAddress(mac);

  Serial.print("MAC: ");

  printMacAddress(mac);
}

void listNetworks() {

  // scan for nearby networks:

  Serial.println("** Scan Networks **");

  int numSsid = WiFi.scanNetworks();

  if (numSsid == -1)

  {

    Serial.println("Couldn't get a wifi connection");

    while (true);

  }

  // print the list of networks seen:

  Serial.print("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(") ");

    Serial.print(WiFi.SSID(thisNet));

    Serial.print("\tSignal: ");

    Serial.print(WiFi.RSSI(thisNet));

    Serial.print(" dBm");

    Serial.print("\tEncryption: ");

    printEncryptionType(WiFi.encryptionType(thisNet));

    Serial.flush();

  }
}

void printEncryptionType(int thisType) {

  // read the encryption type and print out the name:

  switch (thisType) {

    case ENC_TYPE_WEP:

      Serial.println("WEP");

      break;

    case ENC_TYPE_TKIP:

      Serial.println("WPA");

      break;

    case ENC_TYPE_CCMP:

      Serial.println("WPA2");

      break;

    case ENC_TYPE_NONE:

      Serial.println("None");

      break;

    case ENC_TYPE_AUTO:

      Serial.println("Auto");

      break;

  }
}

void printMacAddress(byte mac[]) {

  for (int i = 5; i >= 0; i--) {

    if (mac[i] < 16) {

      Serial.print("0");

    }

    Serial.print(mac[i], HEX);

    if (i > 0) {

      Serial.print(":");

    }

  }

  Serial.println();
}