Refactor WiFi scan example (#7655)

libraries/ESP8266WiFi/examples/WiFiScan/WiFiScan.ino

@@ -3,43 +3,57 @@
     The API is almost the same as with the WiFi Shield library,
     the most obvious difference being the different file you need to include:
 */
-#include "ESP8266WiFi.h"
+
+#include <ESP8266WiFi.h>
 
 void setup() {
   Serial.begin(115200);
+  Serial.println(F("\nESP8266 WiFi scan example"));
 
-  // Set WiFi to station mode and disconnect from an AP if it was previously connected
+  // Set WiFi to station mode
   WiFi.mode(WIFI_STA);
+
+  // Disconnect from an AP if it was previously connected
   WiFi.disconnect();
   delay(100);
-
-  Serial.println("Setup done");
 }
 
 void loop() {
-  Serial.println("scan start");
+  String ssid;
+  int32_t rssi;
+  uint8_t encryptionType;
+  uint8_t* bssid;
+  int32_t channel;
+  bool hidden;
+  int scanResult;
 
-  // WiFi.scanNetworks will return the number of networks found
-  int n = WiFi.scanNetworks();
-  Serial.println("scan done");
-  if (n == 0) {
-    Serial.println("no networks found");
-  } else {
-    Serial.print(n);
-    Serial.println(" networks found");
-    for (int i = 0; i < n; ++i) {
-      // Print SSID and RSSI for each network found
-      Serial.print(i + 1);
-      Serial.print(": ");
-      Serial.print(WiFi.SSID(i));
-      Serial.print(" (");
-      Serial.print(WiFi.RSSI(i));
-      Serial.print(")");
-      Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE) ? " " : "*");
-      delay(10);
+  Serial.println(F("Starting WiFi scan..."));
+
+  scanResult = WiFi.scanNetworks(/*async=*/false, /*hidden=*/true);
+
+  if (scanResult == 0) {
+    Serial.println(F("No networks found"));
+  } else if (scanResult > 0) {
+    Serial.printf(PSTR("%d networks found:\n"), scanResult);
+
+    // Print unsorted scan results
+    for (int8_t i = 0; i < scanResult; i++) {
+      WiFi.getNetworkInfo(i, ssid, encryptionType, rssi, bssid, channel, hidden);
+
+      Serial.printf(PSTR("  %02d: [CH %02d] [%02X:%02X:%02X:%02X:%02X:%02X] %ddBm %c %c %s\n"),
+                    i,
+                    channel,
+                    bssid[0], bssid[1], bssid[2],
+                    bssid[3], bssid[4], bssid[5],
+                    rssi,
+                    (encryptionType == ENC_TYPE_NONE) ? ' ' : '*',
+                    hidden ? 'H' : 'V',
+                    ssid.c_str());
+      delay(0);
     }
+  } else {
+    Serial.printf(PSTR("WiFi scan error %d"), scanResult);
   }
-  Serial.println("");
 
   // Wait a bit before scanning again
   delay(5000);