DigitalInfinity/ESP32-PaxCounter
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code sanitization

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This commit is contained in:
Klaus K Wilting 2018-04-19 15:17:23 +02:00
parent 54945f173e
commit fab0e4f0dd
10 changed files with 210 additions and 197 deletions
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2
platformio.ini
View File

@ -38,7 +38,7 @@ build_flags =
;
; override lora settings from LMiC library in lmic/config.h and use main.h instead
-D_lmic_config_h_
-include "src/main.h"
-include "src/paxcounter.conf"
[env:heltec_wifi_lora_32]
platform = espressif32

4
src/blecsan.cpp
View File

@ -233,8 +233,10 @@ esp_err_t register_ble_functionality(void)
// Main start code running in its own Xtask
void bt_loop(void *ignore)
void bt_loop(void * pvParameters)
{
configASSERT( ( ( uint32_t ) pvParameters ) == 1 ); // FreeRTOS check
esp_err_t status;
// Initialize BT controller to allocate task and other resource.

2
src/configmanager.cpp
View File

@ -18,7 +18,7 @@ esp_err_t err;
// populate cfg vars with factory settings
void defaultConfig() {
cfg.lorasf = LORASFDEFAULT; // 7-12, initial lora spreadfactor defined in main.h
cfg.lorasf = LORASFDEFAULT; // 7-12, initial lora spreadfactor defined in paxcounter.conf
cfg.txpower = 15; // 2-15, lora tx power
cfg.adrmode = 1; // 0=disabled, 1=enabled
cfg.screensaver = 0; // 0=disabled, 1=enabled

1
src/globals.h
View File

@ -22,6 +22,7 @@
#include "rgb_led.h"
#include "macsniff.h"
#include "main.h"
// Struct holding devices's runtime configuration
typedef struct {

34
src/macsniff.cpp
View File

@ -11,46 +11,44 @@
// Local logging tag
static const char *TAG = "macsniff";
// defined in main.cpp
void set_LED (uint16_t set_color, uint16_t set_blinkduration, uint16_t set_interval, uint8_t set_count);
static wifi_country_t wifi_country = {.cc=WIFI_MY_COUNTRY, .schan=WIFI_CHANNEL_MIN, .nchan=WIFI_CHANNEL_MAX, .policy=WIFI_COUNTRY_POLICY_MANUAL};
// globals
uint16_t salt;
uint16_t salt_reset(void) {
salt = random(65536); // get new 16bit random for salting hashes
uint16_t reset_salt(void) {
salt = random(65536); // get new 16bit random for salting hashes and set global salt var
return salt;
}
bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
char buff[16]; // temporary buffer for printf
char buff[16]; // temporary buffer for printf
bool added = false;
uint32_t addr2int;
uint32_t vendor2int;
uint16_t hashedmac;
uint32_t addr2int, vendor2int; // temporary buffer for MAC and Vendor OUI
uint16_t hashedmac; // temporary buffer for generated hash value
// only last 3 MAC Address bytes are used for MAC Address Anonymization
// only last 3 MAC Address bytes are used for MAC address anonymization
// but since it's uint32 we take 4 bytes to avoid 1st value to be 0
addr2int = ( (uint32_t)paddr[2] ) | ( (uint32_t)paddr[3] << 8 ) | ( (uint32_t)paddr[4] << 16 ) | ( (uint32_t)paddr[5] << 24 );
#ifdef VENDORFILTER
vendor2int = ( (uint32_t)paddr[2] ) | ( (uint32_t)paddr[1] << 8 ) | ( (uint32_t)paddr[0] << 16 );
// use OUI vendor filter list only on Wifi, not on BLE
if ( (sniff_type==MAC_SNIFF_BLE) || std::find(vendors.begin(), vendors.end(), vendor2int) != vendors.end() ) {
if ( (sniff_type==MAC_SNIFF_BLE) || std::find(vendors.begin(), vendors.end(), vendor2int) != vendors.end() )
{
#endif
// salt and hash MAC, and if new unique one, store identifier in container and increment counter on display
// https://en.wikipedia.org/wiki/MAC_Address_Anonymization
addr2int += (uint32_t) salt; // add 16-bit salt to pseudo MAC
addr2int += (uint32_t)salt; // add 16-bit salt to pseudo MAC
snprintf(buff, sizeof(buff), "%08X", addr2int); // convert unsigned 32-bit salted MAC to 8 digit hex string
hashedmac = rokkit(&buff[3], 5); // hash MAC last string value, use 5 chars to fit hash in uint16_t container
auto newmac = macs.insert(hashedmac); // add hashed MAC to total container if new unique
added = newmac.second ? true:false; // true if hashed MAC is unique in container
// Insert only if it was not found on global count
// Count only if MAC was not yet seen
if (added) {
if (sniff_type == MAC_SNIFF_WIFI ) {
macs_wifi++; // increment Wifi MACs counter
@ -64,11 +62,11 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
#endif
}
ESP_LOGI(TAG, "%s RSSI %ddBi -> MAC %s -> Hash %04X -> WiFi:%d BLTH:%d %s",
sniff_type==MAC_SNIFF_WIFI ? "WiFi":"BLTH",
rssi, buff, hashedmac,
macs_wifi,
added ? "new" : "known");
// Log scan result
ESP_LOGI(TAG, "%s RSSI %ddBi -> MAC %s -> Hash %04X -> WiFi:%d BLTH:%d %s",
sniff_type==MAC_SNIFF_WIFI ? "WiFi":"BLTH",
rssi, buff, hashedmac, macs_wifi,
added ? "new" : "known");
#ifdef VENDORFILTER
} else {

2
src/macsniff.h
View File

@ -19,7 +19,7 @@ typedef struct {
uint8_t payload[0]; /* network data ended with 4 bytes csum (CRC32) */
} wifi_ieee80211_packet_t;
uint16_t salt_reset(void);
uint16_t reset_salt(void);
void wifi_sniffer_init(void);
void wifi_sniffer_set_channel(uint8_t channel);
void wifi_sniffer_packet_handler(void *buff, wifi_promiscuous_pkt_type_t type);

74
src/main.cpp
View File

@ -32,18 +32,13 @@ Refer to LICENSE.txt file in repository for more details.
#include <lmic.h>
#include <hal/hal.h>
// ESP32 Functions
#include <esp_event_loop.h> // needed for Wifi event handler
#include <esp_spi_flash.h> // needed for reading ESP32 chip attributes
#include <esp32-hal-log.h> // needed for ESP_LOGx on arduino framework
// ESP32 lib Functions
#include <esp_event_loop.h> // needed for Wifi event handler
#include <esp_spi_flash.h> // needed for reading ESP32 chip attributes
#include <esp32-hal-log.h> // needed for ESP_LOGx on arduino framework
configData_t cfg; // struct holds current device configuration
osjob_t sendjob, initjob; // LMIC
enum states {
LED_ON,
LED_OFF
};
configData_t cfg; // struct holds current device configuration
osjob_t sendjob, initjob; // LMIC jobs
// Initialize global variables
char display_lora[16], display_lmic[16]; // display buffers
@ -65,6 +60,7 @@ static volatile bool ButtonTriggered = false;
static const char *TAG = "paxcnt";
// Note: Log level control seems not working during runtime,
// so we need to switch loglevel by compiler build option in platformio.ini
#ifndef VERBOSE
int redirect_log(const char * fmt, va_list args) {
//do nothing
@ -72,30 +68,6 @@ int redirect_log(const char * fmt, va_list args) {
}
#endif
//--- Prototypes ---
// defined in configmanager.cpp
void eraseConfig(void);
void saveConfig(void);
void loadConfig(void);
// defined in lorawan.cpp
void onEvent(ev_t ev);
void do_send(osjob_t* j);
void gen_lora_deveui(uint8_t * pdeveui);
void RevBytes(unsigned char* b, size_t c);
void get_hard_deveui(uint8_t *pdeveui);
// defined in wifisniffer.cpp
void wifi_sniffer_init(void);
void wifi_sniffer_set_channel(uint8_t channel);
void wifi_sniffer_packet_handler(void *buff, wifi_promiscuous_pkt_type_t type);
// defined in blescan.cpp
void bt_loop(void *ignore);
//---
void set_LED (uint16_t set_color, uint16_t set_blinkduration, uint16_t set_interval, uint8_t set_count) {
color = set_color; // set color for RGB LED
LEDBlinkduration = set_blinkduration; // duration on
@ -104,6 +76,13 @@ void set_LED (uint16_t set_color, uint16_t set_blinkduration, uint16_t set_inter
LEDState = set_count ? LED_ON : LED_OFF; // sets LED to off if 0 blinks
}
void reset_counters() {
macs.clear(); // clear all macs container
macs_total = 0; // reset all counters
macs_wifi = 0;
macs_ble = 0;
}
/* begin LMIC specific parts ------------------------------------------------------------ */
@ -163,6 +142,7 @@ static void lora_init (osjob_t* j) {
// LMIC FreeRTos Task
void lorawan_loop(void * pvParameters) {
configASSERT( ( ( uint32_t ) pvParameters ) == 1 ); // FreeRTOS check
while(1) {
@ -227,34 +207,31 @@ void lorawan_loop(void * pvParameters) {
void sniffer_loop(void * pvParameters) {
configASSERT( ( ( uint32_t ) pvParameters ) == 1 ); // FreeRTOS check
channel=0;
char buff[16];
int nloop=0, lorawait=0;
while (true) {
while (1) {
nloop++; // actual number of wifi loops, controls cycle when data is sent
vTaskDelay(cfg.wifichancycle*10 / portTICK_PERIOD_MS);
yield();
channel = (channel % WIFI_CHANNEL_MAX) + 1; // rotates variable channel 1..WIFI_CHANNEL_MAX
wifi_sniffer_set_channel(channel);
ESP_LOGD(TAG, "Wifi set channel %d", channel);
// duration of one wifi scan loop reached? then send data and begin new scan cycle
if ( nloop >= ( (100 / cfg.wifichancycle) * (cfg.wifiscancycle * 2)) +1 ) {
nloop=0; channel=0; // reset wifi scan + channel loop counter
do_send(&sendjob); // Prepare and execute LoRaWAN data upload
vTaskDelay(500/portTICK_PERIOD_MS);
yield();
//vTaskDelay(500/portTICK_PERIOD_MS); // tbd - is this delay really needed here?
//yield();
// clear counter if not in cumulative counter mode
if (cfg.countermode != 1) {
macs.clear(); // clear all macs container
macs_total = 0; // reset all counters
macs_wifi = 0;
macs_ble = 0;
salt_reset(); // get new salt for salting hashes
reset_counters(); // clear macs container and reset all counters
reset_salt(); // get new salt for salting hashes
}
// check if payload is sent
@ -275,6 +252,9 @@ void sniffer_loop(void * pvParameters) {
} // end of send data cycle
vTaskDelay(cfg.wifichancycle*10 / portTICK_PERIOD_MS);
yield();
} // end of infinite wifi channel rotation loop
}
@ -536,7 +516,7 @@ wifi_sniffer_init(); // setup wifi in monitor mode and start MAC counting
// initialize salt value using esp_random() called by random() in arduino-esp32 core
// note: do this *after* wifi has started, since gets it's seed from RF noise
salt_reset(); // get new 16bit for salting hashes
reset_salt(); // get new 16bit for salting hashes
// run wifi task on core 0 and lora task on core 1 and bt task on core 0
ESP_LOGI(TAG, "Starting Lora task on core 1");

146
src/main.h
View File

@ -1,131 +1,41 @@
#pragma once
// program version - note: increment version after modifications to configData_t struct!!
#define PROGVERSION "1.3.1" // use max 10 chars here!
#define PROGVERSION "1.3.2" // use max 10 chars here!
#define PROGNAME "PAXCNT"
// Verbose enables serial output
#define VERBOSE 1 // comment out to silence the device, for mute use build option
//--- Declarations ---
// set this to include BLE counting and vendor filter functions
#define VENDORFILTER 1 // comment out if you want to count things, not people
#define BLECOUNTER 1 // comment out if you don't want BLE count
enum states {
LED_ON,
LED_OFF
};
// BLE scan parameters
#define BLESCANTIME 11 // [seconds] scan duration, see note below
#define BLESCANWINDOW 10 // [milliseconds] scan window, see below, 3 .. 10240, default 10
#define BLESCANINTERVAL 10 // [milliseconds] how long to wait between scans, 3 .. 10240, default 10
//--- Prototypes ---
/* Note: guide for setting bluetooth parameters
*
* |< Scan Window > |< Scan Window > |< Scan Window > |
* |< Scan Interval >|< Scan Interval >|< Scan Interval >|
* |< Scan duration >|
*
* Scan duration sets how long scanning should be going on, interrupting a wifi scan cycle.
* Scan window sets how much of the interval should be occupied by scanning.
* Scan interval is how long scanning should be done on each channel. BLE uses 3 channels for advertising.
* -> Adjust these values with power consumption in mind if power is limited.
*/
// defined in main.cpp
void set_LED (uint16_t set_color, uint16_t set_blinkduration, uint16_t set_interval, uint8_t set_count);
void reset_counters();
// WiFi scan parameters
#define WIFI_CHANNEL_MIN 1 // start channel number where scan begings
#define WIFI_CHANNEL_MAX 13 // total channel number to scan
#define WIFI_MY_COUNTRY "EU" // select locale for Wifi RF settings
#define WIFI_CHANNEL_SWITCH_INTERVAL 50 // [seconds/100] -> 0,5 sec.
// defined in configmanager.cpp
void eraseConfig(void);
void saveConfig(void);
void loadConfig(void);
// LoRa payload send cycle
//#define SEND_SECS 120 // [seconds/2] -> 240 sec.
#define SEND_SECS 30 // [seconds/2] -> 60 sec.
// defined in lorawan.cpp
void onEvent(ev_t ev);
void do_send(osjob_t* j);
void gen_lora_deveui(uint8_t * pdeveui);
void RevBytes(unsigned char* b, size_t c);
void get_hard_deveui(uint8_t *pdeveui);
// Default LoRa Spreadfactor
#define LORASFDEFAULT 9 // 7 ... 12 SF, according to LoRaWAN specs
#define MAXLORARETRY 500 // maximum count of TX retries if LoRa busy
#define RCMDPORT 2 // LoRaWAN Port on which device listenes for remote commands
// defined in wifisniffer.cpp
void wifi_sniffer_init(void);
void wifi_sniffer_set_channel(uint8_t channel);
void wifi_sniffer_packet_handler(void *buff, wifi_promiscuous_pkt_type_t type);
// Default RGB LED luminosity (in %)
#define RGBLUMINOSITY 30 // 30%
// defined in blescan.cpp
void bt_loop(void *ignore);
// OLED Display refresh cycle (in Milliseconds)
#define DISPLAYREFRESH_MS 40 // e.g. 40ms -> 1000/40 = 25 frames per second
// LMIC settings
// define hardware independent LMIC settings here, settings of standard library in /lmic/config.h will be ignored
// define hardware specifics settings in platformio.ini as build_flag for hardware environment
// Select frequency band here according to national regulations
#define CFG_eu868 1
//#define CFG_us915 1
// This is the SX1272/SX1273 radio, which is also used on the HopeRF
// RFM92 boards.
//#define CFG_sx1272_radio 1
// This is the SX1276/SX1277/SX1278/SX1279 radio, which is also used on
// the HopeRF RFM95 boards.
//#define CFG_sx1276_radio 1
// 16 μs per tick
// LMIC requires ticks to be 15.5μs - 100 μs long
#define US_PER_OSTICK_EXPONENT 4
#define US_PER_OSTICK (1 << US_PER_OSTICK_EXPONENT)
#define OSTICKS_PER_SEC (1000000 / US_PER_OSTICK)
// Set this to 1 to enable some basic debug output (using printf) about
// RF settings used during transmission and reception. Set to 2 to
// enable more verbose output. Make sure that printf is actually
// configured (e.g. on AVR it is not by default), otherwise using it can
// cause crashing.
//#define LMIC_DEBUG_LEVEL 1
// Enable this to allow using printf() to print to the given serial port
// (or any other Print object). This can be easy for debugging. The
// current implementation only works on AVR, though.
//#define LMIC_PRINTF_TO Serial
// Any runtime assertion failures are printed to this serial port (or
// any other Print object). If this is unset, any failures just silently
// halt execution.
#define LMIC_FAILURE_TO Serial
// Uncomment this to disable all code related to joining
//#define DISABLE_JOIN
// Uncomment this to disable all code related to ping
#define DISABLE_PING
// Uncomment this to disable all code related to beacon tracking.
// Requires ping to be disabled too
#define DISABLE_BEACONS
// Uncomment these to disable the corresponding MAC commands.
// Class A
//#define DISABLE_MCMD_DCAP_REQ // duty cycle cap
//#define DISABLE_MCMD_DN2P_SET // 2nd DN window param
//#define DISABLE_MCMD_SNCH_REQ // set new channel
// Class B
//#define DISABLE_MCMD_PING_SET // set ping freq, automatically disabled by DISABLE_PING
//#define DISABLE_MCMD_BCNI_ANS // next beacon start, automatical disabled by DISABLE_BEACON
// In LoRaWAN, a gateway applies I/Q inversion on TX, and nodes do the
// same on RX. This ensures that gateways can talk to nodes and vice
// versa, but gateways will not hear other gateways and nodes will not
// hear other nodes. By uncommenting this macro, this inversion is
// disabled and this node can hear other nodes. If two nodes both have
// this macro set, they can talk to each other (but they can no longer
// hear gateways). This should probably only be used when debugging
// and/or when talking to the radio directly (e.g. like in the "raw"
// example).
//#define DISABLE_INVERT_IQ_ON_RX
// This allows choosing between multiple included AES implementations.
// Make sure exactly one of these is uncommented.
//
// This selects the original AES implementation included LMIC. This
// implementation is optimized for speed on 32-bit processors using
// fairly big lookup tables, but it takes up big amounts of flash on the
// AVR architecture.
#define USE_ORIGINAL_AES
//
// This selects the AES implementation written by Ideetroon for their
// own LoRaWAN library. It also uses lookup tables, but smaller
// byte-oriented ones, making it use a lot less flash space (but it is
// also about twice as slow as the original).
// #define USE_IDEETRON_AES
// defined in main.cpp
void reset_counters(void);

129
src/paxcounter.conf Normal file
View File

@ -0,0 +1,129 @@
// ----- Paxcounter user config file ------
//
// --> adapt to your needs and use case <--
// Verbose enables serial output
#define VERBOSE 1 // comment out to silence the device, for mute use build option
// set this to include BLE counting and vendor filter functions
#define VENDORFILTER 1 // comment out if you want to count things, not people
#define BLECOUNTER 1 // comment out if you don't want BLE count
// BLE scan parameters
#define BLESCANTIME 11 // [seconds] scan duration, see note below
#define BLESCANWINDOW 10 // [milliseconds] scan window, see below, 3 .. 10240, default 10
#define BLESCANINTERVAL 10 // [milliseconds] how long to wait between scans, 3 .. 10240, default 10
/* Note: guide for setting bluetooth parameters
*
* |< Scan Window > |< Scan Window > |< Scan Window > |
* |< Scan Interval >|< Scan Interval >|< Scan Interval >|
* |< Scan duration >|
*
* Scan duration sets how long scanning should be going on, interrupting a wifi scan cycle.
* Scan window sets how much of the interval should be occupied by scanning.
* Scan interval is how long scanning should be done on each channel. BLE uses 3 channels for advertising.
* -> Adjust these values with power consumption in mind if power is limited.
*/
// WiFi scan parameters
#define WIFI_CHANNEL_MIN 1 // start channel number where scan begings
#define WIFI_CHANNEL_MAX 13 // total channel number to scan
#define WIFI_MY_COUNTRY "EU" // select locale for Wifi RF settings
#define WIFI_CHANNEL_SWITCH_INTERVAL 50 // [seconds/100] -> 0,5 sec.
// LoRa payload send cycle
//#define SEND_SECS 120 // [seconds/2] -> 240 sec.
#define SEND_SECS 30 // [seconds/2] -> 60 sec.
// Default LoRa Spreadfactor
#define LORASFDEFAULT 9 // 7 ... 12 SF, according to LoRaWAN specs
#define MAXLORARETRY 500 // maximum count of TX retries if LoRa busy
#define RCMDPORT 2 // LoRaWAN Port on which device listenes for remote commands
// Default RGB LED luminosity (in %)
#define RGBLUMINOSITY 30 // 30%
// OLED Display refresh cycle (in Milliseconds)
#define DISPLAYREFRESH_MS 40 // e.g. 40ms -> 1000/40 = 25 frames per second
// LMIC settings
// define hardware independent LMIC settings here, settings of standard library in /lmic/config.h will be ignored
// define hardware specifics settings in platformio.ini as build_flag for hardware environment
// Select frequency band here according to national regulations
#define CFG_eu868 1
//#define CFG_us915 1
// This is the SX1272/SX1273 radio, which is also used on the HopeRF
// RFM92 boards.
//#define CFG_sx1272_radio 1
// This is the SX1276/SX1277/SX1278/SX1279 radio, which is also used on
// the HopeRF RFM95 boards.
//#define CFG_sx1276_radio 1
// 16 μs per tick
// LMIC requires ticks to be 15.5μs - 100 μs long
#define US_PER_OSTICK_EXPONENT 4
#define US_PER_OSTICK (1 << US_PER_OSTICK_EXPONENT)
#define OSTICKS_PER_SEC (1000000 / US_PER_OSTICK)
// Set this to 1 to enable some basic debug output (using printf) about
// RF settings used during transmission and reception. Set to 2 to
// enable more verbose output. Make sure that printf is actually
// configured (e.g. on AVR it is not by default), otherwise using it can
// cause crashing.
//#define LMIC_DEBUG_LEVEL 1
// Enable this to allow using printf() to print to the given serial port
// (or any other Print object). This can be easy for debugging. The
// current implementation only works on AVR, though.
//#define LMIC_PRINTF_TO Serial
// Any runtime assertion failures are printed to this serial port (or
// any other Print object). If this is unset, any failures just silently
// halt execution.
#define LMIC_FAILURE_TO Serial
// Uncomment this to disable all code related to joining
//#define DISABLE_JOIN
// Uncomment this to disable all code related to ping
#define DISABLE_PING
// Uncomment this to disable all code related to beacon tracking.
// Requires ping to be disabled too
#define DISABLE_BEACONS
// Uncomment these to disable the corresponding MAC commands.
// Class A
//#define DISABLE_MCMD_DCAP_REQ // duty cycle cap
//#define DISABLE_MCMD_DN2P_SET // 2nd DN window param
//#define DISABLE_MCMD_SNCH_REQ // set new channel
// Class B
//#define DISABLE_MCMD_PING_SET // set ping freq, automatically disabled by DISABLE_PING
//#define DISABLE_MCMD_BCNI_ANS // next beacon start, automatical disabled by DISABLE_BEACON
// In LoRaWAN, a gateway applies I/Q inversion on TX, and nodes do the
// same on RX. This ensures that gateways can talk to nodes and vice
// versa, but gateways will not hear other gateways and nodes will not
// hear other nodes. By uncommenting this macro, this inversion is
// disabled and this node can hear other nodes. If two nodes both have
// this macro set, they can talk to each other (but they can no longer
// hear gateways). This should probably only be used when debugging
// and/or when talking to the radio directly (e.g. like in the "raw"
// example).
//#define DISABLE_INVERT_IQ_ON_RX
// This allows choosing between multiple included AES implementations.
// Make sure exactly one of these is uncommented.
//
// This selects the original AES implementation included LMIC. This
// implementation is optimized for speed on 32-bit processors using
// fairly big lookup tables, but it takes up big amounts of flash on the
// AVR architecture.
#define USE_ORIGINAL_AES
//
// This selects the AES implementation written by Ideetroon for their
// own LoRaWAN library. It also uses lookup tables, but smaller
// byte-oriented ones, making it use a lot less flash space (but it is
// also about twice as slow as the original).
// #define USE_IDEETRON_AES

11
src/rcommand.cpp
View File

@ -19,10 +19,6 @@ typedef struct {
const bool store;
} cmd_t;
// functions defined in configmanager.cpp
void eraseConfig(void);
void saveConfig(void);
// function defined in antenna.cpp
#ifdef HAS_ANTENNA_SWITCH
void antenna_select(const int8_t _ant);
@ -64,11 +60,8 @@ void set_reset(int val) {
break;
case 1: // reset MAC counter
ESP_LOGI(TAG, "Remote command: reset MAC counter");
macs.clear(); // clear all macs container
macs_total = 0; // reset all counters
macs_wifi = 0;
macs_ble = 0;
salt_reset(); // get new 16bit salt
reset_counters(); // clear macs
reset_salt(); // get new salt
sprintf(display_lora, "Reset counter");
break;
case 2: // reset device to factory settings