modified custom parameters feature so user can provide their own storage mechanism

added FS json storage of parameters example

examples/AutoConnectParametersWithTimeout/AutoConnectParametersWithTimeout.ino

@@ -1,65 +0,0 @@
-#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
-
-
-// The extra parameters to be configured (can be either global or just in the setup)
-WiFiManagerParameter mqtt_server("server", "mqtt server", NULL, 40);
-WiFiManagerParameter mqtt_port("port", "mqtt port", "8080", 8);
-
-void setup() {
-  // put your setup code here, to run once:
-  Serial.begin(115200);
-  
-  //WiFiManager
-  //Local intialization. Once its business is done, there is no need to keep it around
-  WiFiManager wifiManager;
-
-  //add all your parameters here
-  wifiManager.addParameter(&mqtt_server);
-  wifiManager.addParameter(&mqtt_port);
-  
-  //reset settings - for testing
-  wifiManager.resetSettings();
-
-  //load previously saved parameters
-  wifiManager.loadParameters();
-
-  //sets timeout until configuration portal gets turned off
-  //useful to make it all retry or go to sleep
-  //in seconds
-  wifiManager.setTimeout(180);
-  
-  //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")) {
-    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 :)");
-
-  // use your parameter values as needed
-  Serial.print(mqtt_server.getPlaceholder());
-  Serial.print(": ");
-  Serial.println(mqtt_server.getValue());
-
-  Serial.print(mqtt_port.getPlaceholder());
-  Serial.print(": ");
-  Serial.println(mqtt_port.getValue());
-}
-
-void loop() {
-  // put your main code here, to run repeatedly:
-
-
-}

examples/AutoConnectWithFSParameters/AutoConnectWithFSParameters.ino

@@ -0,0 +1,128 @@
+#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.
+const char *mqtt_server = NULL;
+const char *mqtt_port = "8080";
+const char *blynk_token = "YOUR_BLYNK_TOKEN";
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+  Serial.println();
+
+  //read configuration from FS json
+  //SPIFFS.format();
+
+  Serial.println("Mounting FS...");
+
+  if (!SPIFFS.begin()) {
+    Serial.println("Failed to mount file system");
+    //abort
+    return;
+  }
+
+  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);
+      StaticJsonBuffer<200> jsonBuffer;
+      JsonObject& json = jsonBuffer.parseObject(buf.get());
+      json.printTo(Serial);
+      if (json.success()) {
+        Serial.println("\nParsed json");
+
+        mqtt_server = json["mqtt_server"];
+        mqtt_port = json["mqtt_port"];
+        blynk_token = json["blynk_token"];
+      } else {
+        Serial.println("Failed to load json config");
+      }
+    }
+  }
+  //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, 8);
+  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;
+
+  //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();
+
+  //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")) {
+    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
+  mqtt_server = custom_mqtt_server.getValue();
+  mqtt_port = custom_mqtt_port.getValue();
+  blynk_token = custom_blynk_token.getValue();
+  
+  //save the custom parameters to FS
+  StaticJsonBuffer<200> 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");
+    return;
+  }
+
+  json.printTo(Serial);
+  json.printTo(configFile);
+  configFile.close();
+  //end save
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+
+}