[GH-ISSUE #1090] Trying to add custom parameters but getting error! #931

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opened 2026-02-28 01:27:44 +03:00 by kerem · 3 comments

kerem commented

2026-02-28 01:27:44 +03:00

Owner

Originally created by @ZebNZ on GitHub (Jul 8, 2020).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1090

Hi all,

I am trying to add a custom parameter for a username input (char company_username[25]).

Here is my code:

#include <FS.h>                   //this needs to be first, or it all crashes and burns...

#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino

//needed for library
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager

#include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson

//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[34] = "YOUR_BLYNK_TOKEN";
char company_username[25] = "Your Company Username";

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println();

  //clean FS, for testing
  //SPIFFS.format();

  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          Serial.println("\nparsed json");

          strcpy(mqtt_server, json["mqtt_server"]);
          strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);
          strcpy(company_username, json["company_username"]);

        }
        else {
          Serial.println("failed to load json config");
        }
        configFile.close();
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
  //end read



  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
  WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 32);
  WiFiManagerParameter custom_company_username("username", "Company Username", company_username, 25);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback
  wifiManager.setSaveConfigCallback(saveConfigCallback);

  //set static ip
  wifiManager.setSTAStaticIPConfig(IPAddress(10, 0, 1, 99), IPAddress(10, 0, 1, 1), IPAddress(255, 255, 255, 0));

  //add all your parameters here
  wifiManager.addParameter(&custom_mqtt_server);
  wifiManager.addParameter(&custom_mqtt_port);
  wifiManager.addParameter(&custom_blynk_token);
  wifiManager.addParameter(&custom_company_username);

  //reset settings - for testing
  wifiManager.resetSettings();

  //set minimu quality of signal so it ignores AP's under that quality
  //defaults to 8%
  //wifiManager.setMinimumSignalQuality();

  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds
  //wifiManager.setTimeout(120);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect("AutoConnectAP", "password")) {
    Serial.println("failed to connect and hit timeout");
    delay(3000);
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(5000);
  }

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  strcpy(mqtt_server, custom_mqtt_server.getValue());
  strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());
  strcpy(company_username, custom_company_username.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    json["mqtt_server"] = mqtt_server;
    json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;
    json["company_username"] = company_username;

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");
    }

    json.printTo(Serial);
    json.printTo(configFile);
    configFile.close();
    //end save
  }

  Serial.println("local ip");
  Serial.println(WiFi.localIP());

}

void loop() {
  // put your main code here, to run repeatedly:
}

However I am getting this output in the Serial Monitor:

mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"","mqtt_port":"8080","blynk_token":"rt"}
parsed json

Exception (28):
epc1=0x4021e6da epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffb80 end: 3fffffc0 offset: 0190
3ffffd10:  3fff076c 3ffffe30 3ffeee50 402013fe  
3ffffd20:  3fff076c 3ffffe30 3ffeee50 40202258  
3ffffd30:  40219840 00000000 000003e8 4020cc38  
3ffffd40:  3fff070c 3fff0754 00000000 00000000  
3ffffd50:  3ffeeffc feefeffe feefeffe feefeffe  
3ffffd60:  feefeffe feefeffe feefeffe feefeffe  
3ffffd70:  feefeffe feefeffe feefeffe feefeffe  
3ffffd80:  feefeffe feefeffe feefeffe feefeffe  
3ffffd90:  feefeffe feefeffe feefeffe feefeffe  
3ffffda0:  feefeffe feefeffe feefeffe feefeffe  
3ffffdb0:  feefeffe feefeffe feefeffe feefeffe  
3ffffdc0:  feefeffe feefeffe feefeffe feefeffe  
3ffffdd0:  feefeffe feefeffe feefeffe feefeffe  
3ffffde0:  feefeffe feefeffe feefeffe feefeffe  
3ffffdf0:  feefeffe feefeffe feefeffe feefeffe  
3ffffe00:  feefeffe feefeffe feefeffe feefeffe  
3ffffe10:  feefeffe feefeffe feefeffe feefeffe  
3ffffe20:  feefeffe feefeffe feefeffe feefeffe  
3ffffe30:  feefeffe feefeffe feefeffe feefeffe  
3ffffe40:  feefeffe feefeffe feefeffe feefeffe  
3ffffe50:  feefeffe feefeffe feefeffe feefeffe  
3ffffe60:  feefeffe feefeffe feefeffe feefeffe  
3ffffe70:  feefeffe feefeffe feefeffe feefeffe  
3ffffe80:  feefeffe feefeffe feefeffe feefeffe  
3ffffe90:  feefeffe feefeffe feefeffe feefeffe  
3ffffea0:  feefeffe feefeffe feefeffe feefeffe  
3ffffeb0:  feefeffe feefeffe feefeffe feefeffe  
3ffffec0:  feefeffe feefeffe feefeffe feefeffe  
3ffffed0:  feefeffe feefeffe feefeffe 3ffeee50  
3ffffee0:  00000038 3fff0797 feefef0a feefeffe  
3ffffef0:  feefeffe feefeffe feefeffe feefeffe  
3fffff00:  40219700 feefeffe 3fff07ac 00000200  
3fffff10:  feefeffe feefeffe feefeffe feefeffe  
3fffff20:  feefeffe feefeffe feefeffe feefeffe  
3fffff30:  feefeffe feefeffe feefeffe feefeffe  
3fffff40:  feefeffe feefeffe feefeffe feefeffe  
3fffff50:  feefeffe feefeffe feefeffe feefeffe  
3fffff60:  feefeffe feefeffe feefeffe feefeffe  
3fffff70:  feefeffe feefeffe feefeffe feefeffe  
3fffff80:  00000000 feefeffe feefeffe feefeffe  
3fffff90:  feefeffe feefeffe feefeffe 3ffeef80  
3fffffa0:  3fffdad0 00000000 3ffeef40 4020e9b8  
3fffffb0:  feefeffe feefeffe 3ffe8588 40100c39  
<<<stack<<<

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3456, room 16 
tail 0
chksum 0x84
csum 0x84
va5432625
~ld

When I remove the lines setting up the username feature it works fine! Am I meant to make changes in the .h or .cpp files? (I have only changed the .ino file)

Any help with this would be awesome!

Thanks,

Zeb

Originally created by @ZebNZ on GitHub (Jul 8, 2020). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1090 Hi all, I am trying to add a custom parameter for a username input (char company_username[25]). Here is my code: ``` #include <FS.h> //this needs to be first, or it all crashes and burns... #include <ESP8266WiFi.h> //https://github.com/esp8266/Arduino //needed for library #include <DNSServer.h> #include <ESP8266WebServer.h> #include <WiFiManager.h> //https://github.com/tzapu/WiFiManager #include <ArduinoJson.h> //https://github.com/bblanchon/ArduinoJson //define your default values here, if there are different values in config.json, they are overwritten. char mqtt_server[40]; char mqtt_port[6] = "8080"; char blynk_token[34] = "YOUR_BLYNK_TOKEN"; char company_username[25] = "Your Company Username"; //flag for saving data bool shouldSaveConfig = false; //callback notifying us of the need to save config void saveConfigCallback () { Serial.println("Should save config"); shouldSaveConfig = true; } void setup() { // put your setup code here, to run once: Serial.begin(115200); Serial.println(); //clean FS, for testing //SPIFFS.format(); //read configuration from FS json Serial.println("mounting FS..."); if (SPIFFS.begin()) { Serial.println("mounted file system"); if (SPIFFS.exists("/config.json")) { //file exists, reading and loading Serial.println("reading config file"); File configFile = SPIFFS.open("/config.json", "r"); if (configFile) { Serial.println("opened config file"); size_t size = configFile.size(); // Allocate a buffer to store contents of the file. std::unique_ptr<char[]> buf(new char[size]); configFile.readBytes(buf.get(), size); DynamicJsonBuffer jsonBuffer; JsonObject& json = jsonBuffer.parseObject(buf.get()); json.printTo(Serial); if (json.success()) { Serial.println("\nparsed json"); strcpy(mqtt_server, json["mqtt_server"]); strcpy(mqtt_port, json["mqtt_port"]); strcpy(blynk_token, json["blynk_token"]); strcpy(company_username, json["company_username"]); } else { Serial.println("failed to load json config"); } configFile.close(); } } } else { Serial.println("failed to mount FS"); } //end read // The extra parameters to be configured (can be either global or just in the setup) // After connecting, parameter.getValue() will get you the configured value // id/name placeholder/prompt default length WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40); WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6); WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 32); WiFiManagerParameter custom_company_username("username", "Company Username", company_username, 25); //WiFiManager //Local intialization. Once its business is done, there is no need to keep it around WiFiManager wifiManager; //set config save notify callback wifiManager.setSaveConfigCallback(saveConfigCallback); //set static ip wifiManager.setSTAStaticIPConfig(IPAddress(10, 0, 1, 99), IPAddress(10, 0, 1, 1), IPAddress(255, 255, 255, 0)); //add all your parameters here wifiManager.addParameter(&custom_mqtt_server); wifiManager.addParameter(&custom_mqtt_port); wifiManager.addParameter(&custom_blynk_token); wifiManager.addParameter(&custom_company_username); //reset settings - for testing wifiManager.resetSettings(); //set minimu quality of signal so it ignores AP's under that quality //defaults to 8% //wifiManager.setMinimumSignalQuality(); //sets timeout until configuration portal gets turned off //useful to make it all retry or go to sleep //in seconds //wifiManager.setTimeout(120); //fetches ssid and pass and tries to connect //if it does not connect it starts an access point with the specified name //here "AutoConnectAP" //and goes into a blocking loop awaiting configuration if (!wifiManager.autoConnect("AutoConnectAP", "password")) { Serial.println("failed to connect and hit timeout"); delay(3000); //reset and try again, or maybe put it to deep sleep ESP.reset(); delay(5000); } //if you get here you have connected to the WiFi Serial.println("connected...yeey :)"); //read updated parameters strcpy(mqtt_server, custom_mqtt_server.getValue()); strcpy(mqtt_port, custom_mqtt_port.getValue()); strcpy(blynk_token, custom_blynk_token.getValue()); strcpy(company_username, custom_company_username.getValue()); //save the custom parameters to FS if (shouldSaveConfig) { Serial.println("saving config"); DynamicJsonBuffer jsonBuffer; JsonObject& json = jsonBuffer.createObject(); json["mqtt_server"] = mqtt_server; json["mqtt_port"] = mqtt_port; json["blynk_token"] = blynk_token; json["company_username"] = company_username; File configFile = SPIFFS.open("/config.json", "w"); if (!configFile) { Serial.println("failed to open config file for writing"); } json.printTo(Serial); json.printTo(configFile); configFile.close(); //end save } Serial.println("local ip"); Serial.println(WiFi.localIP()); } void loop() { // put your main code here, to run repeatedly: } ``` However I am getting this output in the Serial Monitor: ``` mounting FS... mounted file system reading config file opened config file {"mqtt_server":"","mqtt_port":"8080","blynk_token":"rt"} parsed json Exception (28): epc1=0x4021e6da epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000 >>>stack>>> ctx: cont sp: 3ffffb80 end: 3fffffc0 offset: 0190 3ffffd10: 3fff076c 3ffffe30 3ffeee50 402013fe 3ffffd20: 3fff076c 3ffffe30 3ffeee50 40202258 3ffffd30: 40219840 00000000 000003e8 4020cc38 3ffffd40: 3fff070c 3fff0754 00000000 00000000 3ffffd50: 3ffeeffc feefeffe feefeffe feefeffe 3ffffd60: feefeffe feefeffe feefeffe feefeffe 3ffffd70: feefeffe feefeffe feefeffe feefeffe 3ffffd80: feefeffe feefeffe feefeffe feefeffe 3ffffd90: feefeffe feefeffe feefeffe feefeffe 3ffffda0: feefeffe feefeffe feefeffe feefeffe 3ffffdb0: feefeffe feefeffe feefeffe feefeffe 3ffffdc0: feefeffe feefeffe feefeffe feefeffe 3ffffdd0: feefeffe feefeffe feefeffe feefeffe 3ffffde0: feefeffe feefeffe feefeffe feefeffe 3ffffdf0: feefeffe feefeffe feefeffe feefeffe 3ffffe00: feefeffe feefeffe feefeffe feefeffe 3ffffe10: feefeffe feefeffe feefeffe feefeffe 3ffffe20: feefeffe feefeffe feefeffe feefeffe 3ffffe30: feefeffe feefeffe feefeffe feefeffe 3ffffe40: feefeffe feefeffe feefeffe feefeffe 3ffffe50: feefeffe feefeffe feefeffe feefeffe 3ffffe60: feefeffe feefeffe feefeffe feefeffe 3ffffe70: feefeffe feefeffe feefeffe feefeffe 3ffffe80: feefeffe feefeffe feefeffe feefeffe 3ffffe90: feefeffe feefeffe feefeffe feefeffe 3ffffea0: feefeffe feefeffe feefeffe feefeffe 3ffffeb0: feefeffe feefeffe feefeffe feefeffe 3ffffec0: feefeffe feefeffe feefeffe feefeffe 3ffffed0: feefeffe feefeffe feefeffe 3ffeee50 3ffffee0: 00000038 3fff0797 feefef0a feefeffe 3ffffef0: feefeffe feefeffe feefeffe feefeffe 3fffff00: 40219700 feefeffe 3fff07ac 00000200 3fffff10: feefeffe feefeffe feefeffe feefeffe 3fffff20: feefeffe feefeffe feefeffe feefeffe 3fffff30: feefeffe feefeffe feefeffe feefeffe 3fffff40: feefeffe feefeffe feefeffe feefeffe 3fffff50: feefeffe feefeffe feefeffe feefeffe 3fffff60: feefeffe feefeffe feefeffe feefeffe 3fffff70: feefeffe feefeffe feefeffe feefeffe 3fffff80: 00000000 feefeffe feefeffe feefeffe 3fffff90: feefeffe feefeffe feefeffe 3ffeef80 3fffffa0: 3fffdad0 00000000 3ffeef40 4020e9b8 3fffffb0: feefeffe feefeffe 3ffe8588 40100c39 <<<stack<<< ets Jan 8 2013,rst cause:2, boot mode:(3,6) load 0x4010f000, len 3456, room 16 tail 0 chksum 0x84 csum 0x84 va5432625 ~ld ``` When I remove the lines setting up the username feature it works fine! Am I meant to make changes in the .h or .cpp files? (I have only changed the .ino file) Any help with this would be awesome! Thanks, Zeb

kerem closed this issue

2026-02-28 01:27:44 +03:00

kerem commented

2026-02-28 01:27:44 +03:00

Author

Owner

@ZebNZ commented on GitHub (Jul 8, 2020):

Appears to be faulty ESP8266! Sorry!

@ZebNZ commented on GitHub (Jul 8, 2020): Appears to be faulty ESP8266! Sorry!

kerem commented

2026-02-28 01:27:44 +03:00

Author

Owner

@tablatronix commented on GitHub (Jul 8, 2020):

Might be bad flash, do a full erase, that exception is usually bad memory access so something is out of scope or corrupt

@tablatronix commented on GitHub (Jul 8, 2020): Might be bad flash, do a full erase, that exception is usually bad memory access so something is out of scope or corrupt

kerem commented

2026-02-28 01:27:44 +03:00

Author

Owner

@ZebNZ commented on GitHub (Jul 8, 2020):

Problem not fixed, see #1092

@ZebNZ commented on GitHub (Jul 8, 2020): Problem not fixed, see #1092