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[GH-ISSUE #831] AutoConnectWithFSParametersAndCustomIP #698

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opened 2026-02-28 01:26:37 +03:00 by kerem · 2 comments

kerem commented

2026-02-28 01:26:37 +03:00

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Originally created by @eXadra on GitHub (Feb 21, 2019).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/831

Dear all,
Im trying to use this example of the WifiManager for my ESp8266 applications but I cannot use it with fixed ip. This example given does not work.

The code is just the code as is in the example.

"
#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.
//length should be max size + 1
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[33] = "YOUR_BLYNK_TOKEN";
//default custom static IP
char static_ip[16] = "192.168.1.180";
char static_gw[16] = "192.168.1.254";
char static_sn[16] = "255.255.255.0";

//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();

//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"]);

      if(json["ip"]) {
        Serial.println("setting custom ip from config");
        //static_ip = json["ip"];
        strcpy(static_ip, json["ip"]);
        strcpy(static_gw, json["gateway"]);
        strcpy(static_sn, json["subnet"]);

        Serial.println(static_ip);
      } else {
        Serial.println("no custom ip in config");
      }
    } else {
      Serial.println("failed to load json config");
    }
  }
}

} else {
Serial.println("failed to mount FS");
}
//end read
Serial.println(static_ip);
Serial.println(blynk_token);
Serial.println(mqtt_server);

WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 5);
WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34);

WiFiManager wifiManager;
wifiManager.setSaveConfigCallback(saveConfigCallback);

//set static ip
IPAddress _ip,_gw,_sn;
_ip.fromString(static_ip);
_gw.fromString(static_gw);
_sn.fromString(static_sn);

wifiManager.setSTAStaticIPConfig(_ip, _gw, _sn);

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

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());

//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["ip"] = WiFi.localIP().toString();
json["gateway"] = WiFi.gatewayIP().toString();
json["subnet"] = WiFi.subnetMask().toString();

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

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

}

Serial.println("local ip");
Serial.println(WiFi.localIP());
Serial.println(WiFi.gatewayIP());
Serial.println(WiFi.subnetMask());
}

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

}
"

Debug when putting the setting:
*WM: Handle root
*WM: Sent config page
*WM: WiFi save
*WM: Parameter
*WM: server
*WM: 192.168.1.246
*WM: Parameter
*WM: port
*WM: 1883
*WM: Parameter
*WM: blynk
*WM: olamundo
*WM: static ip
*WM: 192.168.1.181
*WM: static gateway
*WM: 192.168.1.254
*WM: static netmask
*WM: 255.255.255.0
*WM: Sent wifi save page
*WM: Connecting to new AP
*WM: Connecting as wifi client...
*WM: Custom STA IP/GW/Subnet
*WM: 192.168.1.181
*WM: Already connected. Bailing out.
Should save config
connected...yeey :)
saving config
{
"mqtt_server": "192.168.1.246",
"mqtt_port": "1883",
"blynk_token": "olamundo",
"ip": "192.168.1.181",
"gateway": "192.168.1.254",
"subnet": "255.255.255.0"
}local ip
192.168.1.181
192.168.1.254
255.255.255.0
*WM: freeing allocated params!

but when I do a reset this is the debug:
mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"192.168.1.246","mqtt_port":"1883","blynk_token":"olamundo","ip":"192.168.1.181","gateway":"192.168.1.254","subnet":"255.255.255.0"}
parsed json
setting custom ip from config
192.168.1.181
192.168.1.181
olamundo
192.168.1.246
*WM: Adding parameter
*WM: server
*WM: Adding parameter
*WM: port
*WM: Adding parameter
*WM: blynk
*WM:
*WM: AutoConnect
*WM: Connecting as wifi client...
*WM: Custom STA IP/GW/Subnet
*WM: 192.168.1.181
*WM: Using last saved values, should be faster
*WM: Connection result:
*WM: 0
*WM:
*WM: Configuring access point...
*WM: AutoConnectAP
*WM: password
*WM: AP IP address:
*WM: 192.168.4.1
*WM: HTTP server started
......

If I comment _wifiManager.setSTAStaticIPConfig(_ip, _gw, sn); the module sets dhcp and everithing works fine.
Thanks in advance.

Originally created by @eXadra on GitHub (Feb 21, 2019). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/831 ![imagem](https://user-images.githubusercontent.com/34315688/53192919-7eb56980-3607-11e9-9580-f0ac0487464b.png) Dear all, Im trying to use this example of the WifiManager for my ESp8266 applications but I cannot use it with fixed ip. This example given does not work. The code is just the code as is in the example. " #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. //length should be max size + 1 char mqtt_server[40]; char mqtt_port[6] = "8080"; char blynk_token[33] = "YOUR_BLYNK_TOKEN"; //default custom static IP char static_ip[16] = "192.168.1.180"; char static_gw[16] = "192.168.1.254"; char static_sn[16] = "255.255.255.0"; //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(); //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"]); if(json["ip"]) { Serial.println("setting custom ip from config"); //static_ip = json["ip"]; strcpy(static_ip, json["ip"]); strcpy(static_gw, json["gateway"]); strcpy(static_sn, json["subnet"]); Serial.println(static_ip); } else { Serial.println("no custom ip in config"); } } else { Serial.println("failed to load json config"); } } } } else { Serial.println("failed to mount FS"); } //end read Serial.println(static_ip); Serial.println(blynk_token); Serial.println(mqtt_server); WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40); WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 5); WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34); WiFiManager wifiManager; wifiManager.setSaveConfigCallback(saveConfigCallback); //set static ip IPAddress _ip,_gw,_sn; _ip.fromString(static_ip); _gw.fromString(static_gw); _sn.fromString(static_sn); wifiManager.setSTAStaticIPConfig(_ip, _gw, _sn); //add all your parameters here wifiManager.addParameter(&custom_mqtt_server); wifiManager.addParameter(&custom_mqtt_port); wifiManager.addParameter(&custom_blynk_token); wifiManager.setMinimumSignalQuality(); 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()); //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["ip"] = WiFi.localIP().toString(); json["gateway"] = WiFi.gatewayIP().toString(); json["subnet"] = WiFi.subnetMask().toString(); File configFile = SPIFFS.open("/config.json", "w"); if (!configFile) { Serial.println("failed to open config file for writing"); } json.prettyPrintTo(Serial); json.printTo(configFile); configFile.close(); //end save } Serial.println("local ip"); Serial.println(WiFi.localIP()); Serial.println(WiFi.gatewayIP()); Serial.println(WiFi.subnetMask()); } void loop() { // put your main code here, to run repeatedly: } " Debug when putting the setting: *WM: Handle root *WM: Sent config page *WM: WiFi save *WM: Parameter *WM: server *WM: 192.168.1.246 *WM: Parameter *WM: port *WM: 1883 *WM: Parameter *WM: blynk *WM: olamundo *WM: static ip *WM: 192.168.1.181 *WM: static gateway *WM: 192.168.1.254 *WM: static netmask *WM: 255.255.255.0 *WM: Sent wifi save page *WM: Connecting to new AP *WM: Connecting as wifi client... *WM: Custom STA IP/GW/Subnet *WM: 192.168.1.181 *WM: Already connected. Bailing out. Should save config connected...yeey :) saving config { "mqtt_server": "192.168.1.246", "mqtt_port": "1883", "blynk_token": "olamundo", "ip": "192.168.1.181", "gateway": "192.168.1.254", "subnet": "255.255.255.0" }local ip 192.168.1.181 192.168.1.254 255.255.255.0 *WM: freeing allocated params! but when I do a reset this is the debug: mounting FS... mounted file system reading config file opened config file {"mqtt_server":"192.168.1.246","mqtt_port":"1883","blynk_token":"olamundo","ip":"192.168.1.181","gateway":"192.168.1.254","subnet":"255.255.255.0"} parsed json setting custom ip from config 192.168.1.181 192.168.1.181 olamundo 192.168.1.246 *WM: Adding parameter *WM: server *WM: Adding parameter *WM: port *WM: Adding parameter *WM: blynk *WM: *WM: AutoConnect *WM: Connecting as wifi client... *WM: Custom STA IP/GW/Subnet *WM: 192.168.1.181 *WM: Using last saved values, should be faster *WM: Connection result: *WM: 0 *WM: *WM: Configuring access point... *WM: AutoConnectAP *WM: password *WM: AP IP address: *WM: 192.168.4.1 *WM: HTTP server started ...... If I comment **_wifiManager.setSTAStaticIPConfig(_ip, _gw, _sn);_** the module sets dhcp and everithing works fine. Thanks in advance.

kerem commented

2026-02-28 01:26:38 +03:00

Author

Owner

@sischi commented on GitHub (May 12, 2019):

I'm facing the same issue. After first boot, the device will boot its config portal, as expected. After setting up wifi it will give me a
*WM: Already connected. Bailing out.
but I can't reach the device (with a ping). After a reboot the device will boot its config portal again (and again, and again, ...).

If I use DHCP (by commenting the static configuration) all works as expected.

@sischi commented on GitHub (May 12, 2019): I'm facing the same issue. After first boot, the device will boot its config portal, as expected. After setting up wifi it will give me a `*WM: Already connected. Bailing out.` but I can't reach the device (with a ping). After a reboot the device will boot its config portal again (and again, and again, ...). If I use DHCP (by commenting the static configuration) all works as expected.

kerem commented

2026-02-28 01:26:38 +03:00

Author

Owner

@tablatronix commented on GitHub (May 12, 2019):

try hotfixes branch

@tablatronix commented on GitHub (May 12, 2019): try hotfixes branch