#include <ESP8266WiFi.h>
extern "C" {
  #include "user_interface.h"
}

byte channel;
uint16_t beaconPacket(uint8_t* output, uint8_t channel, uint8_t* mac, String& ssid){
  *(output++) = 0x80;
  *(output++) = 0x00;
  *(output++) = 0x00;
  *(output++) = 0x00;
  *(output++) = 0xFF; *(output++) = 0xFF; *(output++) = 0xFF; 
  *(output++) = 0xFF; *(output++) = 0xFF; *(output++) = 0xFF;
  for (uint8_t i=0; i<6; i++) *(output++) = mac[i];           
  for (uint8_t i=0; i<6; i++) *(output++) = mac[i];           
  *(output++) = 0xC0; *(output++) = 0x6C;                     
  *(output++) = 0x83; *(output++) = 0x51; *(output++) = 0xF7; *(output++) = 0x8F; 
  *(output++) = 0x0F; *(output++) = 0x00; *(output++) = 0x00; *(output++) = 0x00;
  *(output++) = 0x64; *(output++) = 0x00;                    
  *(output++) = 0x01; *(output++) = 0x04;                     
  uint16_t ssid_amount = ssid.length();
  *(output++) = 0; *(output++) = ssid_amount;               

  for (uint16_t i=0; i < ssid_amount; i++){
    *(output++) = ssid[i];
  }

  *(output++) = 0x01; *(output++) = 0x08;                    
  *(output++) = 0x82; *(output++) = 0x84; *(output++) = 0x8B; *(output++) = 0x96;
  *(output++) = 0x24; *(output++) = 0x30; *(output++) = 0x48; *(output++) = 0x6C;
  
  *(output++) = 0x03; *(output++) = 0x01; *(output++) = channel; 

  uint16_t returnValue = 51 +ssid_amount;
  return returnValue;
}

void setup() {
  delay(500);
  wifi_set_opmode(STATION_MODE);
  wifi_promiscuous_enable(1); 
}

void loop() {
    channel = random(1,12); 
    wifi_set_channel(channel);
    uint8_t beaconMAC[6];
    beaconMAC[0] = random(256);
    beaconMAC[1] = random(256);
    beaconMAC[2] = random(256);
    beaconMAC[3] = random(256);
    beaconMAC[4] = random(256);
    beaconMAC[5] = random(256);
    String ssid = "( ?° ?? ?°)"
    uint8_t  beaconData[128];
    uint16_t packetSize = beaconPacket(beaconData, channel, beaconMAC, ssid);
    
    wifi_send_pkt_freedom(beaconData, packetSize, 0);
    wifi_send_pkt_freedom(beaconData, packetSize, 0);
    wifi_send_pkt_freedom(beaconData, packetSize, 0);
    
    delay(1);
}