WiFiScan Example - new one
Posted: Sun Sep 27, 2015 2:34 pmHeya folks,
I've been learning Arduino/Json lately so decided to expand an old WiFiScan example a bit, now it scans WiFi, makes JSON representation of scan results and saves them into SPIFFS,
and here is the code ->
I hope it could be useful to someone.
--
Mozz
I've been learning Arduino/Json lately so decided to expand an old WiFiScan example a bit, now it scans WiFi, makes JSON representation of scan results and saves them into SPIFFS,
and here is the code ->
Code: Select all
/*
* Copyright (c) 2015. Mario Mikočević <mozgy>
*
* MIT Licence
*
*/
// Serial printing ON/OFF
#include "Arduino.h"
#define DEBUG true
// #define Serial if(DEBUG)Serial
// #define DEBUG_OUTPUT Serial
ADC_MODE(ADC_VCC);
#include "ESP8266WiFi.h"
#include "FS.h"
#include <ArduinoJson.h> // https://github.com/bblanchon/ArduinoJson
char tmpstr[40];
File fh_netdata;
String line;
extern "C" {
#include "user_interface.h"
}
void setup() {
Serial.begin(115200);
delay(10);
Serial.setDebugOutput(true);
Serial.println();
Serial.print( F("Heap: ") ); Serial.println(system_get_free_heap_size());
Serial.print( F("Boot Vers: ") ); Serial.println(system_get_boot_version());
Serial.print( F("CPU: ") ); Serial.println(system_get_cpu_freq());
Serial.print( F("SDK: ") ); Serial.println(system_get_sdk_version());
Serial.print( F("Chip ID: ") ); Serial.println(system_get_chip_id());
Serial.print( F("Flash ID: ") ); Serial.println(spi_flash_get_id());
Serial.print( F("Flash Size: ") ); Serial.println(ESP.getFlashChipRealSize());
Serial.print( F("Vcc: ") ); Serial.println(ESP.getVcc());
Serial.println();
bool result = SPIFFS.begin();
if( !result ) {
Serial.println( F("SPIFFS open failed!") );
}
/*
// comment format section after DEBUGING done
result = SPIFFS.format();
if( !result ) {
Serial.println("SPIFFS format failed!");
}
*/
// SPIFFS.remove( "/netdata.txt" );
// Set WiFi to station mode and disconnect from an AP if it was previously connected
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
Serial.println( F("Setup done") );
}
void loop() {
do_wifiscan();
Serial.print( F("Heap: ") ); Serial.println(system_get_free_heap_size());
ElapsedStr( tmpstr );
Serial.println( tmpstr );
// Wait some time before scanning again
delay(900000);
}
void do_wifiscan( void ) {
int netCount;
Serial.println( F("scan start") );
// WiFi.scanNetworks will return the number of networks found
netCount = WiFi.scanNetworks();
// Serial.println("scan done"); // no need if Serial.setDebugOutput(true)
if ( netCount == 0 ) {
Serial.println("no network found");
} else {
Serial.print(netCount);
Serial.println(" network(s) found");
parse_networks( netCount );
}
Serial.println("");
}
void parse_networks( int netNum ) {
/*
for (int i = 0; i < net_num; ++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);
}
*/
if ( !update_netdata( netNum ) ) {
Serial.println( F("Something went WRONG!") );
}
}
bool update_netdata( int netNum ) {
int netId;
int netFound = 0;
DynamicJsonBuffer jsonBuffer;
// fh_netdata.println( "{\"count\":0,\"max\":0}" );
// fh_netdata.println( "{\"count\":0,\"max\":0,\"networks\":[{\"ssid\":\"ssid\",\"bssid\":\"bssid\",\"rssi\":0,\"ch\":1,\"enc\":\"*\"}]}" );
// create new data from network list
JsonObject& WiFiData = jsonBuffer.createObject();
WiFiData["count"] = netNum;
WiFiData["max"] = netNum;
JsonArray& WiFiDataArray = WiFiData.createNestedArray("networks");
fh_netdata = SPIFFS.open("/netdata.txt", "r");
if ( !fh_netdata ) {
// no last data
Serial.println( F("Data file doesn't exist yet.") );
fh_netdata = SPIFFS.open("/netdata.txt", "w");
if ( !fh_netdata ) {
Serial.println( F("Data file creation failed") );
return false;
}
for ( int i = 0; i < netNum; ++i ) {
JsonObject& tmpObj = jsonBuffer.createObject();
tmpObj["id"] = i;
tmpObj["ssid"] = WiFi.SSID(i);
tmpObj["bssid"] = bssidToString( WiFi.BSSID(i) );
tmpObj["rssi"] = WiFi.RSSI(i);
tmpObj["ch"] = WiFi.channel(i);
tmpObj["enc"] = ((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
Serial.print("Add - ");tmpObj.printTo( Serial );Serial.println();
WiFiDataArray.add( tmpObj );
}
// WiFiData is wifi scan snapshot
// Serial.println("Scanned wifi data ->");
// WiFiData.printTo( Serial );
// WiFiData.prettyPrintTo( Serial );
// Serial.println("");
} else {
// read last WiFi data from file
// Serial.println( F("Reading saved wifi data ..") );
line = fh_netdata.readStringUntil('\n');
// Serial.print( F("Line (read) ") );Serial.println( line );
JsonObject& WiFiDataFile = jsonBuffer.parseObject( line );
if ( !WiFiDataFile.success() ) {
Serial.println( F("parsing failed") );
// parsing failed, removing old data
SPIFFS.remove( "/netdata.txt" );
return false;
}
int netNumFile = WiFiDataFile["count"];
int netMaxFile = WiFiDataFile["max"];
netId = netMaxFile;
// WiFiDataFile.prettyPrintTo( Serial );
// Serial.println("");
JsonArray& tmpArray = WiFiDataFile["networks"];
for ( JsonArray::iterator it = tmpArray.begin(); it != tmpArray.end(); ++it ) {
JsonObject& tmpObj = *it;
WiFiDataArray.add( tmpObj );
Serial.print("Copy - ");tmpObj.printTo( Serial );Serial.println();
}
for ( int i = 0; i < netNum; i++ ) {
bool wifiNetFound = false;
for ( int j = 0; j < netNumFile; j++ ) {
String ssid1 = WiFi.SSID(i);
String ssid2 = WiFiDataArray[j]["ssid"];
if ( ssid1 == ssid2 ) {
String bssid1 = bssidToString( WiFi.BSSID(i) );
String bssid2 = WiFiDataArray[j]["bssid"];
if ( bssid1 == bssid2 ) {
wifiNetFound = true;
}
}
}
if ( !wifiNetFound ) {
JsonObject& tmpObj = jsonBuffer.createObject();
tmpObj["id"] = netId;
tmpObj["ssid"] = WiFi.SSID(i);
tmpObj["bssid"] = bssidToString( WiFi.BSSID(i) );
tmpObj["rssi"] = WiFi.RSSI(i);
tmpObj["ch"] = WiFi.channel(i);
tmpObj["enc"] = ((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
WiFiDataArray.add( tmpObj );
Serial.print("Found new - ");tmpObj.printTo( Serial );Serial.println();
netFound++;
netId++;
}
}
WiFiData["count"] = netNumFile + netFound;
WiFiData["max"] = netId;
// Serial.println("Computed wifi data ->");
// WiFiData.prettyPrintTo( Serial );
fh_netdata.close();
SPIFFS.remove( "/netdata.txt" );
fh_netdata = SPIFFS.open("/netdata.txt", "w");
if ( !fh_netdata ) {
Serial.println( F("Data file creation failed") );
return false;
}
}
WiFiData.printTo( fh_netdata );
fh_netdata.println( "\n" );
fh_netdata.close();
return true;
}
String bssidToString( uint8_t *bssid ) {
char mac[18] = {0};
sprintf( mac,"%02X:%02X:%02X:%02X:%02X:%02X", bssid[0], bssid[1], bssid[2], bssid[3], bssid[4], bssid[5] );
return String( mac );
}
void ElapsedStr( char *str ) {
unsigned long sec, minute, hour;
sec = millis() / 1000;
minute = ( sec % 3600 ) / 60;
hour = sec / 3600;
sprintf( str, "Elapsed " );
if ( hour == 0 ) {
sprintf( str, "%s ", str );
} else {
sprintf( str, "%s%2d:", str, hour );
}
if ( minute >= 10 ) {
sprintf( str, "%s%2d:", str, minute );
} else {
if ( hour != 0 ) {
sprintf( str, "%s0%1d:", str, minute );
} else {
sprintf( str, "%s ", str );
if ( minute == 0 ) {
sprintf( str, "%s ", str );
} else {
sprintf( str, "%s%1d:", str, minute );
}
}
}
if ( ( sec % 60 ) < 10 ) {
sprintf( str, "%s0%1d", str, ( sec % 60 ) );
} else {
sprintf( str, "%s%2d", str, ( sec % 60 ) );
}
}I hope it could be useful to someone.
--
Mozz