ESP WiFi sniffer with OLED and http upload

#include "ESP8266WiFi.h"
#include "oled.h"
ADC_MODE(ADC_VCC);
OLED Display=OLED(D1,D2);
int RawPort = A0;
char server[] = "192.168.1.101";
String uploadfile = "wifi.php";
String postVariable = "WiFi=";
const char* ssid = "MyWiFi";
const char* password = "P@55w0rd";
String total = "";
void setup() {
//  Serial.begin(115200);
//  Serial.println("");
  Display.begin();
  Display.setTTYMode(true);
  pinMode(LED_BUILTIN, OUTPUT);
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
  Display.print("Battery: ");
  Display.print(ESP.getVcc());
//  Display.print("\n\rSetup done");
}
void loop() {
//  int Batt = ESP.getVcc();
//  Serial.print("Battery voltage is: "+Batt);
//  Display.print(ESP.getVcc());
//  Serial.print("Wifi scan...");
  Display.set_contrast(128);
  Display.print("\n\rScan...");
  int n = WiFi.scanNetworks();
//  Serial.println(" done");
  Display.println(" done");
  if (n == 0) {
//    Serial.println("No Networks Found");
    Display.printf("No Networks Found");
    digitalWrite(LED_BUILTIN, LOW);
  }
  else {
//    Serial.print(n);
//    Serial.println(" Networks found");
    digitalWrite(LED_BUILTIN, HIGH);
    Display.set_contrast(8);
    Display.printf("%d networks found",n);
    String nr = String(n) + " APs detected. ";
    for (int i = 0; i < n; ++i) {
//      Serial.print(i + 1);
//      Serial.print(": ");
//      Serial.print(WiFi.SSID(i));
//      Serial.print(" RSSI: ");
//      Serial.print(WiFi.RSSI(i)); 
//      Serial.print(" MAC: ");
//      Serial.print(WiFi.BSSIDstr(i));
//      Serial.print(" Enc: ");
//      Serial.println(encType(i));
    Display.println();
    Display.print(i + 1);
    Display.print(": ");
    Display.print(WiFi.SSID(i));
    Display.print(" (");
    Display.print(WiFi.RSSI(i));
    Display.println(")");
    Display.print("   ");
    Display.print(WiFi.BSSIDstr(i));
    total = total+String(i+1)+": "+String(WiFi.SSID(i))+" "+String(WiFi.BSSIDstr(i))+" "+String(WiFi.RSSI(i))+"db "+String(encType(i))+". ";
    delay(500);
    }
 
    WiFi.scanDelete();
    delay (500);
    Display.println("\n\rSleep for 1min...");
    
    WiFiClient client;
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
     delay(500);
    }
    
    
    String postData = postVariable + nr + total;
//    Serial.print("Transmitted data: ");
//    Serial.println(postData);
    
    if (client.connect(server, 80)) {
     client.print("POST /");
     client.print(uploadfile);
     client.println(" HTTP/1.1");
     client.print("Host: ");
     client.println (server);
     client.println("Content-Type: application/x-www-form-urlencoded");
     client.print("Content-Length: ");
     client.println(postData.length());
     client.println();
     client.print(postData);
    }
    if (client.connected()) {
      client.stop();
    }
//   Serial.println("Sleeping ");
   Display.set_power(false);
//   delay(10000);
   ESP.deepSleep(6e+7); // 60 sec  
  }
}
// Readable Encryption Type
String encType(int id){
String type;
  if(WiFi.encryptionType(id) == ENC_TYPE_WEP){ type=" WEP";
  }else if(WiFi.encryptionType(id) == ENC_TYPE_TKIP){ type="WPA-TKIP";    
  }else if(WiFi.encryptionType(id) == ENC_TYPE_CCMP){ type="WPA2-CCMP";    
  }else if(WiFi.encryptionType(id) == ENC_TYPE_AUTO){ type="WPA-WPA2";    
  }else if(WiFi.encryptionType(id) == ENC_TYPE_NONE){ type="OPEN";    
  }
  return type;
}

$cat wifi.php

<?php

$file = fopen("/var/www/html/wifi.txt", "a+") or die("Unable to open file!");

date_default_timezone_set("America/New_York");

$time = date('Y-m-d_H:i:s');

$read = $_POST["WiFi"];

$data = "{$time} - {$read}\n";

fwrite($file, $data);

fclose($file);

?>

Check if WiFi is still connected on rpi

 #!/bin/bash

gateway='192.168.0.1'

lockfile='/var/run/chk-wifi.pid'

wlan='wlan0'

if [ -e $lockfile ]; then

    echo `date +%F\ %T\ `$0": A lockfile exists... Lets check to see if it is still valid"

    pid=`cat $lockfile`

    if kill -0 &>1 > /dev/null $pid; then

     echo `date +%F\ %T\ `$0": Process still running, Lockfile valid."

     exit 1

    else

     echo `date +%F\ %T\ `$0": Invalid Lockfile, Removing."

     rm $lockfile

    fi

fi

#echo `date +%F\ %T\ `$0": Setting Lockfile"

echo $$ > $lockfile

#echo `date +%F\ %T\ `$0": Performing network check for $wlan"

ping -c2 $gateway 2>&1

rc=$?

if [[ $rc -eq 0 ]] ; then

        echo `date +%F\ %T\ `$0": The network is up."

else

        echo `date +%F\ %T\ `$0": Network down! Attempting reconnection."

        ifdown $wlan

#        echo `date +%F\ %T\ `$0": Cycling rpi3 onboard wifi driver"

        rmmod brcmfmac

        sleep 2

#        echo `date +%F\ %T\ `$0": Most probable cause in rpi1-2 is USB jamming, cycling the power on USB"

#        echo 0 > /sys/devices/platform/soc/20980000.usb/buspower

#        sleep 2

#        echo 1 > /sys/devices/platform/soc/20980000.usb/buspower

#        sleep 1

#        echo `date +%F\ %T\ `$0": Bringing back the WiFi"

        modprobe brcmfmac

        ifup --force $wlan

#        sleep 1

#        echo `date +%F\ %T\ `$0": New IP: $(ifconfig $wlan | grep 'inet addr')"

#        echo `date +%F\ %T\ `$0": "$(hostname -I)

fi

#echo `date +%F\ %T\ `$0": Remove lock & exit"

rm $lockfile

exit 0

DD-WRT wireless extender

Setup -> Basic Setup -> WAN Connection Type -> Connection Type ->Disabled

Network Setup -> Router IP -> Local IP Address - choose an IP outside the DHCP Range from the main router
Gateway and Local DNS - usually the IP of the main router

Wireless -> Basic Settings -> First interface (2.4GHz) -> Wireless Mode: Client Bridge (Routed)
Default GW Mode: Manual
Gateway: IP of the main router
Wireless Security: same as on main router

Wireless -> Basic Settings -> Second interface (5GHz) -> Wireless Mode: AP
Set the WiFi network the way you want - You can duplicate the 5GHz config form the main router. this way the clients will do seamless roaming.

Services -> disable all
Security -> disable all
Access Restrictions -> disable all
NAT / QoS -> disable all

Administration -> Management
802.1x: Disable
Reset Button: Disable
Routing: Disable

Administration -> Keep Alive
Enable Watchdog: Enable
Interval (in seconds): 900
IP Addresses: Ip of the main router