Wifi connection and configuration manager for ESP8266 and ESP32.

This library was made to ease the complication of configuring Wifi and other
settings on an ESP8266 or ESP32. It is roughly split into two parts, Wifi configuration
and REST variable configuration.

Requires

• ArduinoJson version 6

Quick Start

Installing

You can install through the Arduino Library Manager. The package name is
ConfigManager.

Usage

Include the library in your sketch

#include <ConfigManager.h>

Create your config and meta structs. These are the definitions for your settings.

struct Config {
    char name[20];
    bool enabled;
    int8_t hour;
    char password[20];
} config;

struct Metadata {
    int8_t version;
} meta;

Note: These are examples of possible settings. The config is required, these values are arbitrary.

Initialize a global instance of the library

ConfigManager configManager;

In your setup function start the manager

configManager.setAPName("Demo");
configManager.setAPFilename("/index.html");
configManager.addParameter("name", config.name, 20);
configManager.addParameter("enabled", &config.enabled);
configManager.addParameter("hour", &config.hour);
configManager.addParameter("password", config.password, 20, set);
configManager.addParameter("version", &meta.version, get);
configManager.begin(config);

In your loop function, run the manager loop

configManager.loop();

To access your config data through device code

char* name = config.name;
int version = meta.version;

To change a value through device code

strncpy(config.name, "New Name", 8);
meta.version = 8;
configManager.save();

Additional files saved

Upload the index.html file found in the data directory into the SPIFFS.
Instructions on how to do this vary based on your IDE. Below are links instructions
on the most common IDEs:

ESP8266

• Arduino IDE

• Platform IO

ESP32

• Arduino IDE

• Platform IO

Documentation

Debugging

Enabling

By default, ConfigManager runs in DEBUG_MODE off. This is to allow the serial iterface to communicate as needed.
To turn on debugging, add the following line inside your setup routine:

DEBUG_MODE = true

Using

To use the debugger, change your Serial.print calls to DebugPrint. Output will then be toggled via the debugger.

Methods

getMode

Mode getMode()

Gets the current mode, ap or api.

setAPName

void setAPName(const char *name)

Sets the name used for the access point.

setAPPassword

void setAPPassword(const char *password)

Sets the password used for the access point. For WPA2-PSK network it should be at least 8 character long.
If not specified, the access point will be open for anybody to connect to.

setAPFilename

void setAPFilename(const char *filename)

Sets the path in SPIFFS to the webpage to be served by the access point.

setAPTimeout

void setAPTimeout(const int timeout)

Sets the access point timeout, in seconds (default 0, no timeout).

Note: The timeout starts when the access point is started, but is evaluated in the loop function.

setInitCallback

void setInitCallback(std::function<void()> callback)

Sets a function that will be called when the ConfigManager is first initialized. This can be used to
set default values on configuration parameters.

setAPCallback

void setAPCallback(std::function<void(WebServer*)> callback)

Sets a function that will be called when the WebServer is started in AP mode allowing custom HTTP endpoints to be created.

setAPICallback

void setAPICallback(std::function<void(WebServer*)> callback)

Sets a function that will be called when the WebServer is started in API/Settings mode allowing custom HTTP endpoints to be created.

setWifiConfigURI

void setWifiConfigURI(const char* uri)

Changes the URI for the Wifi Configuration Page. Defaults to “/”

setWifiConnectRetries

void setWifiConnectRetries(const int retries)

Sets the number of Wifi connection retires. Defaults to 20.

setWifiConnectInterval

void setWifiConnectInterval(const int interval)

Sets the interval (in milliseconds) between Wifi connection retries. Defaults to 500ms.

setWebPort

void setWebPort(const int port)

Sets the port that the web server listens on. Defaults to 80.

addParameter

template<typename T>
void addParameter(const char *name, T *variable)

or

template<typename T>
void addParameter(const char *name, T *variable, ParameterMode mode)

Adds a parameter to the REST interface. The optional mode can be set to set
or get to make the parameter read or write only (defaults to both).

addParameter (string)

void addParameter(const char *name, char *variable, size_t size)

or

void addParameter(const char *name, char *variable, size_t size, ParameterMode mode)

Adds a character array parameter to the REST interface.The optional mode can be set to set
or get to make the parameter read or write only (defaults to both).

clearWifiSettings(bool reboot)

Sets SSID/Password to NULL
The bool reboot indicates if the device should restart after clearing the values.

clearSettings(bool reboot)

Sets all managed settings (not Wifi) to NULL. This is useful to clear all setting, but maintain Wifi.
The bool reboot indicates if the device should restart after clearing the values.

clearAllSettings(bool reboot)

Sets all settings (managed and Wifi) to NULL. This is useful to re-initialize the memory of the device.
The bool reboot indicates if the device should restart after clearing the values.

begin

template<typename T>
void begin(T &config)

Starts the configuration manager. The config parameter will be saved into
and retrieved from the EEPROM.

save

void save()

Saves the config passed to the begin function to the EEPROM.

loop

void loop()

Handles any waiting REST requests.

streamFile(const char *file, const char mime[])

server->on("/settings.html", HTTPMethod::HTTP_GET, [server](){
    configManager.streamFile(settingsHTMLFile, mimeHTML);
});

Stream a file to the server when using custom routing endpoints.
See example/save_config_demo/save_config_demo.ino

stopWebserver()

void ConfigManager::stopWebserver()

Stops the built-in webserver to allow your custom project
webserver to run without port/resource interference.
See example/custom-http/custom-http.ino

Endpoints

GET /

Modes: AP and API

Gets the HTML page that is used to set the Wifi SSID and password.

• Response 200 (text/html)

POST /

Modes: AP and API

Sets the Wifi SSID and password. The form example can be found in the data directory.

• Request (application/x-www-form-urlencoded)

ssid=access point&password=some password

• Request (application/json)

{
  "ssid": "access point",
  "password": "some password"
}

GET /scan

Modes: AP and API

Scans visible networks

• Will print to Serial Monitor is DEBUG_MODE = true

• Response 200 (application/json)

{
  "ssid": "access point name",
  "strength": *int*,
  "security": *bool*
}

GET /settings

Modes: API

Gets the settings set in addParameter.

• Response 200 (application/json)

{
  "enabled": true,
  "hour": 3
}

PUT /settings

Modes: API

Sets the settings set in addParameter.

• Request (application/json)

{
  "enabled": false,
  "hour": 4
}

• Response 400 (application/json)

• Response 204 (application/json)