I’m trying to remove hardcoded wfif and auth details from a project and I’ve run into an error I don’t know how to troubleshoot.
The hardware is a wemos D1 and a Max6675 temperature board.
if I include the max6675 library, when the device tries to connect to the Blynk server it gives an error;
BLYNK Connection Fail
*WM: settings invalidated
*WM: THIS MAY CAUSE AP NOT TO START UP PROPERLY. YOU NEED TO COMMENT IT OUT AFTER ERASING THE DATA.
If I comment out the max6675 library the same details connect sucessfully.
Here is the sketch, which I copied from another wifi manager thread.
// Start
#include <FS.h> //this needs to be first, or it all crashes and burns...
#include <ESP8266WiFi.h> //https://github.com/esp8266/Arduino
#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp8266.h>
//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
// Needed for the Thermocouple
#include <max6675.h>
//int thermoDO = D5;
//int thermoCS = D6;
//int thermoCLK = D7;
//MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
//int vccPin = 3;
//int gndPin = 2;
//define your default values here, if there are different values in config.json, they are overwritten.
char blynk_token[34] = "Enter 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 setup() {
// put your setup code here, to run once:
Serial.begin(9600);
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"]);
} 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, 34);
//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
}
Blynk.config(blynk_token);
bool result = Blynk.connect(180);
if (result != true)
{
Serial.println("BLYNK Connection Fail");
wifiManager.resetSettings();
ESP.reset();
delay (5000);
}
else
{
Serial.println("BLYNK Connected");
}
}
void loop() {
// put your main code here, to run repeatedly:
Blynk.run();
}