Sending HTTP POST Request with Arduino and ENC28J60 Ethernet LAN Network Module

Question

I just bought new ENC28J60 Ethernet LAN Network Module on Ebay, and I want to send POST Data with this module to specified web address eg. www.mydomain.com/example.php

I resereached google for some examples, but all I could saw were examples for arduino shield, not module I have. With this module I'm using following libraries:

"etherShield.h"
"ETHER_28J60.h"

I want to send one/two specified POSTS (variables) to the php formular, but i don't know how to do this.

Answer 1

First of all you need to install following library: https://github.com/jcw/ethercard

connect your module to arduino with 6 pins:

• ENC SO -> Arduino pin 12
• ENC SI -> Arduino pin 11
• ENC SCK -> Arduino pin 13
• ENC CS -> Arduino pin 8
• ENC VCC -> Arduino 3V3 pin
• ENC GND -> Arduino Gnd pin

then use following code:

#include <EtherCard.h>

// your variable

#define PATH    "example.php"
#define VARIABLE    "test"

// ethernet interface mac address, must be unique on the LAN
byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };

char website[] PROGMEM = "www.mydomain.com";

byte Ethernet::buffer[700];
uint32_t timer;
Stash stash;

void setup () {
  Serial.begin(57600);
  Serial.println("\n[webClient]");

  if (ether.begin(sizeof Ethernet::buffer, mymac) == 0) 
    Serial.println( "Failed to access Ethernet controller");
  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");

  ether.printIp("IP:  ", ether.myip);
  ether.printIp("GW:  ", ether.gwip);  
  ether.printIp("DNS: ", ether.dnsip);  

  if (!ether.dnsLookup(website))
    Serial.println("DNS failed");

  ether.printIp("SRV: ", ether.hisip);
}

void loop () {
  ether.packetLoop(ether.packetReceive());

  if (millis() > timer) {
    timer = millis() + 10000;

    byte sd = stash.create();
    stash.print("variable=");
    stash.print(VARIABLE);
    stash.print("&action=Submit");
    stash.save();

    // generate the header with payload - note that the stash size is used,
    // and that a "stash descriptor" is passed in as argument using "$H"
    Stash::prepare(PSTR("POST http://$F/$F.csv HTTP/1.0" "\r\n"
                "Host: $F" "\r\n"
                "Content-Length: $D" "\r\n"
                "Content-Type: application/x-www-form-urlencoded" "\r\n"
                "\r\n"
                "$H"),
    website, PSTR(PATH), website, stash.size(), sd);

    // send the packet - this also releases all stash buffers once done
    ether.tcpSend();
  }
}