Note to mitul(eastern)

notes on esp8266

Hi Mitul,

My best esp8266 code is in https://github.com/mckennatim/demiot. A couple of notes on it.

You can always get it online by hard coding your SSID info ala...

   #include <ESP8266WiFi.h>
   #include <ESP8266WebServer.h>
   
   const char *ssid = "street_no_vale2";
   const char *pwd = "jjjjjjjj";
   
   ESP8266WebServer server(80);
   
   void handleRoot() {
     server.send(200, "text/html", "h1 root of espAPsb AP server /h1");
   }
   
   void getOnline(){
     WiFi.begin(ssid, pwd);
     int tries =0;
     int success=1;
     while (WiFi.status() != WL_CONNECTED ) {
       delay(500);
       Serial.print(".");
       tries++;
       if (tries==15){
         success=0;
         scan();
         setupAP();
         break;
       }
     }
     if (success){
       Serial.println("");
       Serial.println("WiFi connected");
       Serial.print("IP address: ");
       Serial.println(WiFi.localIP());    
     }   
   }

   void setup(){
     Serial.begin(115200);
     Serial.println();
     Serial.println("--------------------------");
     Serial.println("ESP8266 webconfig");
     Serial.println("--------------------------");
     getOnline();
   }

   void loop(){
     server.handleClient();
   }

but that is not at all interesting for a couple of reasons

1. you shouldn't have to be reconnect and upload over USB every time you move to a new SSID
2. this sets you up as a server instead of client. There are lots of downsides to that. (your customers have to open ports on their routers ala xbox, an outside server&clients needs to keep track of its IP...)

So you need to be able to webconfig the thing and then run it as a client.

In denmiot/essp8266/mqttall I broke out webconfig in `#include "config.h"` (excuse the `extern` globals).

setup calls getOnline() which reads a config from the EEPROM and connects but if that fails it jumps into webconfig mode, turning itself into and access point server with an SSID of `espAPsb` and an ip of 192.168.4.1 where you can send it a get string like

  http://192.168.4.1/config?ssid=street_no_vale2&pwd=jjjjjjjj&devid=CYURD001&ip=10.0.1.100&port=3332

once you send it that it reboots itself (sometimes you need to hit the reset or powerdown) as a client on your local wifi.

mqtt

mqtt is a very cool pu/sub/ protocol. For some reason though it won't automatically reconnect when you do a webconfig. You have to power down first