How to send data with an ESP8266

i started today esp8266 , had working quite fast. again @ command system ez pz.

i can:
- let automatically log in @ home wifi @ powerup
- let set webserver
- log in server internet browser , processing sketch
- send information client server

but can't is, sending data server client.
the code using not complicated

code: [select]

void loop() {
  if (serial.find("connect")) {           // when log in
    (int j = 0; j < 5; j++) {           
      serial.print("at+cipsend=5");     // @ command
      (int = 0; < 6; i++) {          // followed directly by..
        serial.print(i);                          // 6 byes (1 5 in ascii char) sent client and
      }                                             // gets repeated 10 times every second
      delay(1000); 
    }
  }
}

the esp poops out connect whenever log on esp why use serial.find("connect"); function. part works far, can see when log in.

i figured have use at+cipsend command in order send data. have read must send ammount of characters, in case 5, right after at-command given. not getting feeling sending anything.

i use following processing sketch client:

code: [select]

import processing.net.*;

client c;

void setup() {
  size(770, 900);
  background(240);
  fill(50);

  c = new client(this, "192.168.2.15", 80);
  c.write("sup"); // sends something
}

void draw()
{
  if (c.available() > 4) { // if there's incoming data client..atleast 5 bytes
    string data = "";      // declares empty string data
    background(240); // resets background / clears text

    while (c.available () > 0) { // while there bytes in buffer
      data += c.readchar(); // puts bytes in string data     
    }
    println(data);
    text(data, 3, 15);    // puts string in screen
  }
}

void keypressed()    // gets called whenever touch me keyboard
{ 
  c = new client(this, "192.168.2.15", 80); // connect server on port 80
  c.write((char)key); // sends character trigger esp8266
}

i think code works, it's pretty straight forward. think code arduino not doing want do 

any solutions and/or brainfarts?

make sure don't have multiple connections on. when issue command "at+cipmux?" should reply 0, if replies 1, means have mux on, means can have multiple sockets open @ same time, in case need identify socket talking on each command.

with cipmux=1, command send needs socket identifier, , in form of: at+cipsend=id,len

if don't need multiple connections, issue at+cipmux=0 first

whenever i'm not clear on what's going on dialog between arduino , esp, place rx wire in ftdi usb-serial cable onto either rx or tx in esp, on serial monitor can check what's being sent or received, if helps

good luck

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > How to send data with an ESP8266

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