Unable to connect in Ap_mode in esp32
Question
I am making and auto connect code for esp32 in which i am trying to get wifi credential from the webpage when it is operated in ap-mode after getting credential it will connected to wifi whose credential are provided in webpage. But problem i am facing is that i am unable to connect my esp module when it is in ap mode here is my code.
#include "SPIFFS.h"
#include <FS.h>
#include <ArduinoJson.h>
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
uint8_t pin_led = 2;
char* ssid = "YOUR_SSID"; //not used
char* password = "YOUR_AP_PASSWORD";
char* mySsid = "YOUR_AP_SSID";
AsyncWebServer server(80);
IPAddress local_ip(192,168,11,4);
IPAddress gateway(192,168,11,1);
IPAddress netmask(255,255,255,0);
char webpage[] PROGMEM = R"=====(
<html>
<head>
</head>
<body>
<form>
<fieldset>
<div>
<label for="ssid">SSID</label>
<input value="" id="ssid" placeholder="SSID">
</div>
<div>
<label for="password">PASSWORD</label>
<input type="password" value="" id="password" placeholder="PASSWORD">
</div>
<div>
<button class="primary" id="savebtn" type="button" onclick="myFunction()">SAVE</button>
</div>
</fieldset>
</form>
</body>
<script>
function myFunction()
{
console.log("button was clicked!");
var ssid = document.getElementById("ssid").value;
var password = document.getElementById("password").value;
var data = {ssid:ssid, password:password};
var xhr = new XMLHttpRequest();
var url = "/settings";
xhr.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// Typical action to be performed when the document is ready:
if(xhr.responseText != null){
console.log(xhr.responseText);
}
}
};
xhr.open("POST", url, true);
xhr.send(JSON.stringify(data));
};
</script>
</html>
)=====";
void setup()
{
pinMode(pin_led, OUTPUT);
Serial.begin(115200);
SPIFFS.begin();
wifiConnect();
server.on("/", HTTP_POST, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", webpage);
});
server.on("/toggle", HTTP_POST, [](AsyncWebServerRequest *request){
digitalWrite(pin_led,!digitalRead(pin_led));
request->send(204,"");
});
server.on("/settings", HTTP_POST, [](AsyncWebServerRequest *request){
if(request->hasArg("plain")){
String data = request->arg("plain");//("plain");
DynamicJsonDocument doc(1024);
serializeJson(doc, data);
// DynamicJsonBuffer jBuffer;
//JsonObject jObject = doc.as<JsonObject>();
File configFile = SPIFFS.open("/config.json", "w");
serializeJsonPretty(doc, configFile);
//jObject.printTo(configFile);
configFile.close();
request->send(200, "application/json", "{\"status\" : \"ok\"}");
delay(500);
wifiConnect();
}});
server.begin();
}
void loop()
{
}
void wifiConnect()
{
//reset networking
WiFi.softAPdisconnect(true);
WiFi.disconnect();
delay(1000);
//check for stored credentials
if(SPIFFS.exists("/config.json")){
const char * _ssid = "", *_pass = "";
File configFile = SPIFFS.open("/config.json", "r");
if(configFile){
size_t size = configFile.size();
std::unique_ptr<char[]> buf(new char[size]);
configFile.readBytes(buf.get(), size);
configFile.close();
DynamicJsonDocument doc(1024);
// DynamicJsonBuffer jsonBuffer;
DeserializationError error=deserializeJson(doc, buf.get());
//JsonObject& jObject = doc.as<JsonObject>();
if (error)
{
Serial.print("deserializeJson() failed: ");
Serial.println(error.c_str());
}
else{
_ssid = doc["ssid"];
_pass = doc["password"];
WiFi.mode(WIFI_STA);
WiFi.begin(_ssid, _pass);
unsigned long startTime = millis();
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
digitalWrite(pin_led,!digitalRead(pin_led));
if ((unsigned long)(millis() - startTime) >= 5000) break;
}
}
}
}
if (WiFi.status() == WL_CONNECTED)
{
digitalWrite(pin_led,HIGH);
} else
{
WiFi.mode(WIFI_AP);
WiFi.softAPConfig(local_ip, gateway, netmask);
WiFi.softAP(mySsid, password);
digitalWrite(pin_led,LOW);
}
Serial.println("");
WiFi.printDiag(Serial);
}
Please help me to figure it out
1 answers
solution1
0 2020-03-18 09:38:31
Putting the wifiConnect() as the last command in setup worked for my environment.
This program works only under two important preconditions.
1. No json on SPIFFS - so make sure during testing you always have a fresh formatted SPIFFS
2. No open AP in range, because it will connect to it without pw and no AP_mode would be initiated.
There are a lot of more or less working examples for captive portals especially for ESP32 around, but they all have their specific detection problems (eg always read the issues on github)
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