[GH-ISSUE #567] PubSubClient #475

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opened 2026-02-28 01:25:29 +03:00 by kerem · 3 comments

kerem commented

2026-02-28 01:25:29 +03:00

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Originally created by @AchimPieters on GitHub (Mar 20, 2018).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/567

Dear tzapu,

First of all, I want to thank you for this awesome library! Great Work!

Unfortunately I ran into some trouble combining your Wifimanger with pubsubclient. I can't get it to work? I have worked so long on this that I don't see other options anymore.... Could you please help me setting up the basic Wifi manger with the PubSub client intrigrated. If I know this one is the right base, then I can work upon this base. Maybe It's a idea to add it to your Examples?

Here's 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

#include <PubSubClient.h>         //https://github.com/Imroy/pubsubclient

//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "1883";
//char blynk_token[34] = "YOUR_BLYNK_TOKEN";

//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 callback(const MQTT::Publish& pub) {
  // handle message arrived
}

WiFiClient wclient;
PubSubClient client(wclient, mqtt_server);


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

  client.set_callback(callback);

  //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"]);

        } else {
          Serial.println("failed to load json config");
        }
      }
    }
  } 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);

  //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);

  //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());

  //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;

    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:
  if (!client.connected()) {
    if (client.connect("arduinoClient")) {
      client.publish("outTopic", "hello world");
      client.subscribe("inTopic");
    }
  }

  if (client.connected())
    client.loop();
}

Thanks in advanced!

Originally created by @AchimPieters on GitHub (Mar 20, 2018). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/567 Dear tzapu, First of all, I want to thank you for this awesome library! Great Work! Unfortunately I ran into some trouble combining your Wifimanger with pubsubclient. I can't get it to work? I have worked so long on this that I don't see other options anymore.... Could you please help me setting up the basic Wifi manger with the PubSub client intrigrated. If I know this one is the right base, then I can work upon this base. Maybe It's a idea to add it to your Examples? Here's 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 #include <PubSubClient.h> //https://github.com/Imroy/pubsubclient //define your default values here, if there are different values in config.json, they are overwritten. char mqtt_server[40]; char mqtt_port[6] = "1883"; //char blynk_token[34] = "YOUR_BLYNK_TOKEN"; //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 callback(const MQTT::Publish& pub) { // handle message arrived } WiFiClient wclient; PubSubClient client(wclient, mqtt_server); void setup() { // put your setup code here, to run once: Serial.begin(115200); Serial.println(); client.set_callback(callback); //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"]); } else { Serial.println("failed to load json config"); } } } } 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); //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); //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()); //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; 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: if (!client.connected()) { if (client.connect("arduinoClient")) { client.publish("outTopic", "hello world"); client.subscribe("inTopic"); } } if (client.connected()) client.loop(); } ``` Thanks in advanced!

kerem closed this issue

2026-02-28 01:25:29 +03:00

kerem commented

2026-02-28 01:25:30 +03:00

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Owner

@shamil-yazeen commented on GitHub (Jun 17, 2020):

@AchimPieters : im stuck with the same error !did you find any solution?

@shamil-yazeen commented on GitHub (Jun 17, 2020): @AchimPieters : im stuck with the same error !did you find any solution?

kerem commented

2026-02-28 01:25:30 +03:00

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Owner

@tablatronix commented on GitHub (Jun 17, 2020):

Make a new issue

@tablatronix commented on GitHub (Jun 17, 2020): Make a new issue

kerem commented

2026-02-28 01:25:30 +03:00

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Owner

@shamil-yazeen commented on GitHub (Jul 2, 2020):