Folks,
TL;DR does ESP remember wifi credentials after removing them from sketch and reloading?
I decided to try the FSBrowser example. This required me to enter my SSID and password for my local wifi connection. It will serve a web page with wonderful data plots, but I wanted to avoid my network and have ESP serve the page through wifi as an access point.
I tried modifying the WiFiAccessPoint example, basically just replace the connecting to my home SSID with launching AP and then the server...
Now, I got my phone to connect to the ESP AP and it loaded the wonderful web page.
Then I noticed the serial monitor spit out data that ESP connected to my home SSID. I was getting the web page on my phone via AP and then I tried a computer on my network and it was there too!!!
How is that possible? I removed my SSID and PW from the sketch. DOES ESP remember these settings?
After a couple minutes, it seems ESP crashes and it started pumping out rst messages, but eventually recovered...
ets Jan 8 2013,rst cause:4, boot mode:(3,6)
wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v614f7c32
~ld
FS File: /edit.htm.gz, size: 4.02KB
FS File: /favicon.ico, size: 1.12KB
FS File: /graphs.js.gz, size: 1.92KB
FS File: /index.htm, size: 3.63KB
scandone
state: 0 -> 2 (b0)
Configuring access point...AP IP address: 192.168.4.1
Open [url]http://esp8266fs.local/edit[/url] to see the file browser
HTTP server started
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 4
cnt
connected with HOME-SSID, channel 1
dhcp client start...
ip:192.168.1.70,mask:255.255.255.0,gw:192.168.1.254
add 1
aid 1
station: fc:db:b3:49:d6:58 join, AID = 1
handleFileRead: /
handleFileRead: /
handleFileRead: /graphs.js
handleFileRead: /favicon.ico
/*
FSWebServer - Example WebServer with SPIFFS backend for esp8266
Copyright (c) 2015 Hristo Gochkov. All rights reserved.
This file is part of the ESP8266WebServer library for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
upload the contents of the data folder with MkSPIFFS Tool ("ESP8266 Sketch Data Upload" in Tools menu in Arduino IDE)
or you can upload the contents of a folder if you CD in that folder and run the following command:
for file in `ls -A1`; do curl -F "file=@$PWD/$file" esp8266fs.local/edit; done
access the sample web page at [url]http://esp8266fs.local[/url]
edit the page by going to [url]http://esp8266fs.local/edit[/url]
*/
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <FS.h>
#define DBG_OUTPUT_PORT Serial
//(these are commented and are fake too, how does ESP know the credentials?)
//const char* ssid = "HOME-SSID";
//const char* password = "xxxxxxxxxxxxxxxxxx";
//change to AP
/* Set these to your desired credentials. */
const char *ssid = "ESPap";
const char *password = "password";
const char* host = "esp8266fs";
ESP8266WebServer server(80);
//holds the current upload
File fsUploadFile;
//format bytes
String formatBytes(size_t bytes){
if (bytes < 1024){
return String(bytes)+"B";
} else if(bytes < (1024 * 1024)){
return String(bytes/1024.0)+"KB";
} else if(bytes < (1024 * 1024 * 1024)){
return String(bytes/1024.0/1024.0)+"MB";
} else {
return String(bytes/1024.0/1024.0/1024.0)+"GB";
}
}
String getContentType(String filename){
if(server.hasArg("download")) return "application/octet-stream";
else if(filename.endsWith(".htm")) return "text/html";
else if(filename.endsWith(".html")) return "text/html";
else if(filename.endsWith(".css")) return "text/css";
else if(filename.endsWith(".js")) return "application/javascript";
else if(filename.endsWith(".png")) return "image/png";
else if(filename.endsWith(".gif")) return "image/gif";
else if(filename.endsWith(".jpg")) return "image/jpeg";
else if(filename.endsWith(".ico")) return "image/x-icon";
else if(filename.endsWith(".xml")) return "text/xml";
else if(filename.endsWith(".pdf")) return "application/x-pdf";
else if(filename.endsWith(".zip")) return "application/x-zip";
else if(filename.endsWith(".gz")) return "application/x-gzip";
return "text/plain";
}
bool handleFileRead(String path){
DBG_OUTPUT_PORT.println("handleFileRead: " + path);
if(path.endsWith("/")) path += "index.htm";
String contentType = getContentType(path);
String pathWithGz = path + ".gz";
if(SPIFFS.exists(pathWithGz) || SPIFFS.exists(path)){
if(SPIFFS.exists(pathWithGz))
path += ".gz";
File file = SPIFFS.open(path, "r");
server.streamFile(file, contentType);
file.close();
return true;
}
return false;
}
void handleFileUpload(){
if(server.uri() != "/edit") return;
HTTPUpload& upload = server.upload();
if(upload.status == UPLOAD_FILE_START){
String filename = upload.filename;
if(!filename.startsWith("/")) filename = "/"+filename;
DBG_OUTPUT_PORT.print("handleFileUpload Name: "); DBG_OUTPUT_PORT.println(filename);
fsUploadFile = SPIFFS.open(filename, "w");
filename = String();
} else if(upload.status == UPLOAD_FILE_WRITE){
//DBG_OUTPUT_PORT.print("handleFileUpload Data: "); DBG_OUTPUT_PORT.println(upload.currentSize);
if(fsUploadFile)
fsUploadFile.write(upload.buf, upload.currentSize);
} else if(upload.status == UPLOAD_FILE_END){
if(fsUploadFile)
fsUploadFile.close();
DBG_OUTPUT_PORT.print("handleFileUpload Size: "); DBG_OUTPUT_PORT.println(upload.totalSize);
}
}
void handleFileDelete(){
if(server.args() == 0) return server.send(500, "text/plain", "BAD ARGS");
String path = server.arg(0);
DBG_OUTPUT_PORT.println("handleFileDelete: " + path);
if(path == "/")
return server.send(500, "text/plain", "BAD PATH");
if(!SPIFFS.exists(path))
return server.send(404, "text/plain", "FileNotFound");
SPIFFS.remove(path);
server.send(200, "text/plain", "");
path = String();
}
void handleFileCreate(){
if(server.args() == 0)
return server.send(500, "text/plain", "BAD ARGS");
String path = server.arg(0);
DBG_OUTPUT_PORT.println("handleFileCreate: " + path);
if(path == "/")
return server.send(500, "text/plain", "BAD PATH");
if(SPIFFS.exists(path))
return server.send(500, "text/plain", "FILE EXISTS");
File file = SPIFFS.open(path, "w");
if(file)
file.close();
else
return server.send(500, "text/plain", "CREATE FAILED");
server.send(200, "text/plain", "");
path = String();
}
void handleFileList() {
if(!server.hasArg("dir")) {server.send(500, "text/plain", "BAD ARGS"); return;}
String path = server.arg("dir");
DBG_OUTPUT_PORT.println("handleFileList: " + path);
Dir dir = SPIFFS.openDir(path);
path = String();
String output = "[";
while(dir.next()){
File entry = dir.openFile("r");
if (output != "[") output += ',';
bool isDir = false;
output += "{\"type\":\"";
output += (isDir)?"dir":"file";
output += "\",\"name\":\"";
output += String(entry.name()).substring(1);
output += "\"}";
entry.close();
}
output += "]";
server.send(200, "text/json", output);
}
void handleRoot() {
server.send(200, "text/html", "<h1>You are connected</h1>");
}
void setup(void){
DBG_OUTPUT_PORT.begin(115200);
DBG_OUTPUT_PORT.print("\n");
DBG_OUTPUT_PORT.setDebugOutput(true);
SPIFFS.begin();
{
Dir dir = SPIFFS.openDir("/");
while (dir.next()) {
String fileName = dir.fileName();
size_t fileSize = dir.fileSize();
DBG_OUTPUT_PORT.printf("FS File: %s, size: %s\n", fileName.c_str(), formatBytes(fileSize).c_str());
}
DBG_OUTPUT_PORT.printf("\n");
}
/* change this block to AP?
//WIFI INIT
DBG_OUTPUT_PORT.printf("Connecting to %s\n", ssid);
if (String(WiFi.SSID()) != String(ssid)) {
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
}
while (WiFi.status() != WL_CONNECTED) {
delay(500);
DBG_OUTPUT_PORT.print(".");
}
DBG_OUTPUT_PORT.println("");
DBG_OUTPUT_PORT.print("Connected! IP address: ");
DBG_OUTPUT_PORT.println(WiFi.localIP());
*/
//AP block
Serial.println();
Serial.print("Configuring access point...");
/* You can remove the password parameter if you want the AP to be open. */
WiFi.softAP(ssid, password);
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
//server.on("/", handleRoot);
//server.begin();
// Serial.println("HTTP server started");
//end AP block
MDNS.begin(host);
DBG_OUTPUT_PORT.print("Open http://");
DBG_OUTPUT_PORT.print(host);
DBG_OUTPUT_PORT.println(".local/edit to see the file browser");
//SERVER INIT
//list directory
server.on("/list", HTTP_GET, handleFileList);
//load editor
server.on("/edit", HTTP_GET, [](){
if(!handleFileRead("/edit.htm")) server.send(404, "text/plain", "FileNotFound");
});
//create file
server.on("/edit", HTTP_PUT, handleFileCreate);
//delete file
server.on("/edit", HTTP_DELETE, handleFileDelete);
//first callback is called after the request has ended with all parsed arguments
//second callback handles file uploads at that location
server.on("/edit", HTTP_POST, [](){ server.send(200, "text/plain", ""); }, handleFileUpload);
//called when the url is not defined here
//use it to load content from SPIFFS
server.onNotFound([](){
if(!handleFileRead(server.uri()))
server.send(404, "text/plain", "FileNotFound");
});
//get heap status, analog input value and all GPIO statuses in one json call
server.on("/all", HTTP_GET, [](){
String json = "{";
json += "\"heap\":"+String(ESP.getFreeHeap());
json += ", \"analog\":"+String(analogRead(A0));
json += ", \"gpio\":"+String((uint32_t)(((GPI | GPO) & 0xFFFF) | ((GP16I & 0x01) << 16)));
json += "}";
server.send(200, "text/json", json);
json = String();
});
server.begin();
DBG_OUTPUT_PORT.println("HTTP server started");
}
void loop(void){
server.handleClient();
}