View source for 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
# you shouldn't have to be reconnect and upload over USB every time you move to a new SSID
# 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