- Sun Mar 06, 2016 12:08 pm
#42564
So, i was finally able to get it working .... it's not perfect but it works... (btw the code is much shorter than all other ones)
I need something simple and mosty i use only websockets to talk with the esp8266 modules, so the loop needs to be empty.
I didn't wanted to slow down everything using one of those already existing libs.
Most of them handle the connection inside the loop() ????. SPEED, i need SPEED!!!!!!!
Also some libs fill the whole memory... just to connect the device.
Some need switches to reenter the credentials...
I also learned the hard way that in AP mode the esp totally sucks.
thats why i wrote this code
Info about the code1. Creates an Access Point (AP) if no Infrastructure (STA) connection or credentials are aviable.
2. It uses the EEPROM to store the credentials.
3. Default (but changeable) values:
-AP-
SSID : wave
Host :
http://wave.local/ IP:
http://192.168.4.1/-STA-
Host :
http://wave.local/What does this code:1. Reads the EEPROM
2. If no credentials are aviable it creates an AP
-2a. After connecting to the AP with the default IP or Host it scans the aviable networks
-2b. And responds with a simple form to connect to the desidered one.
-2c. By selecting your ssid from a dropdown list and setting the password you'r now rdy to submit
-2d. The ESP will store your credentials in the EEPROM and reset after 30 seconds
3. If credentials are aviable but they are wrong or your in a different location and cannot connect
-3a. It tries to connnect to the stored network for 30 seconds.
-3b. If it is not able to connect it creates an AP and from there the steps are the same as in 2a to 2d
4. If credentials are aviable and the stored network exists NOTHING HAPPENS ... you need to write what you want in the loop
Code: Select all#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266mDNS.h>
#include <EEPROM.h>
MDNSResponder mdns;
WiFiServer server(80);
char s[32];
char p[64];
boolean apDone(){
mdns.update();
WiFiClient client=server.available();
if(!client)return false;
while(client.connected()&&!client.available());
if(client.readStringUntil(' ')=="GET"){
String b="";
if(uint8_t a=WiFi.scanNetworks()){
b+="<select name=\"ssid\">";
while(a--){
b+="<option>";
b+=WiFi.SSID(a);
b+="</option>";
}
b+="</select>";
}else{
b+="<input name=\"ssid\" length=\"32\">";
}
client.print("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!doctype html><html><body><form method=\"post\">"+b+"<input name='pass' length=64><input type='submit'></form></body></html>\r\n\r\n");
client.flush();
}else{
String header=client.readString();
header=header.substring(header.indexOf("ssid=")+5);
String ssid=header.substring(0,header.indexOf("&pass="));
String pass=header.substring(header.indexOf("&pass=")+6);
for(uint8_t a=0;a<96;a++)EEPROM.write(a,a<32?ssid[a]:pass[a-32]);
EEPROM.commit();
client.print("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!doctype html><html><body>Restarting in 30 seconds</body></html>\r\n\r\n");
client.flush();
delay(30000);
ESP.restart();
}
return false;
}
void setup(){
EEPROM.begin(512);
for(uint8_t a=0;a<96;a++)(a<32?s[a]:p[a-32])=EEPROM.read(a);
if(s[0]){
WiFi.mode(WIFI_STA);
WiFi.begin(s,p);
while(millis()<30000){
delay(100);
if(WiFi.status()==WL_CONNECTED){
mdns.begin("wave",WiFi.localIP());
//server.begin();
/*YOU ARE CONNECTED TO A FAST NETWORK*/
/*WRITE YOUR SETUP HERE*/
return;
}
}
}
WiFi.disconnect();
WiFi.mode(WIFI_AP);
WiFi.softAP("wave");
mdns.begin("wave",WiFi.softAPIP());
server.begin();
while(!apDone());
return;
}
void loop(){
} Now the code works nicely on my esp8266 and also prolly on yours but there are some things i want to change
I'm not a c++ programmer, i mostly wrtie in webbased languages.
I need to find an elegant way to minimize this whole code further.Most of all i hate this part:
Code: Select all String header=client.readString();
header=header.substring(header.indexOf("ssid=")+5);
String ssid=header.substring(0,header.indexOf("&pass="));
String pass=header.substring(header.indexOf("&pass=")+6); I'm using lots of functions and variables(STRINGS!!!!!!!) to extract the post data from the header.
Please tell me that there is something simple,maybe faster(without adding another lib) ... i want to do things properly
Another thing is
... did i put it in the correct place?
Some people put that before they send the data to the client.
What about the
.. is that necessary only when writing?
I added almost no delays ... just the really necessary ones... would you add more? why?
Should the following vars
changed to
?
i could not get it work the other way.
Also thos are doubles of ssid & pass inside the apDone function.
it would be nice to remove one of those duplicates... obviously avoiding complex conversions between strings or whatever.
Last edited by cocco on Sun Mar 06, 2016 1:05 pm, edited 4 times in total.
