Trouble with Sending HTTP 1.1 GET request - http-headers

Question

I am trying to use PubNub to publish a message to a channel but I always get "Connection Failed!".
I know the structure of a publish URL is the following:
http://pubsub.pubnub.com/publish/<PUB-KEY>/<SUB-KEY>/0/<CHANNEL>/0/%22<MESSAGE>%22
I have tested the URL on Google Chrome and it works just fine.
The following is a C flavored code is running on an Arduino UNO + Adafruit HUZZAH CC3000 WIFI Breakout. This is not an Arduino hardware question per se, because I believe there is nothing wrong with my circuit. My issue is with the structure of the HTTP GET request created using Adafruit CC3000 Library.
I am having to go with sending a GET rather than using PubNub Arduino Library because it doesn't seem to support CC3000 WIFI module. They have a JSON WIFI and Ethernet examples but both do not communicate with the CC3000 WIFI module.
char PUBKEY[] = "XXXXXXX";
char SUBKEY[] = "XXXXXXX";
Adafruit_CC3000_Client client = cc3000.connectTCP(ip, 80);
if (client.connected())
{
client.print("GET /publish/");
client.print(PUBKEY);
client.print("/");
client.print(SUBKEY);
client.print("/0/");
client.print("MyPubChannel"); // Channel Name
client.print("/0/%22");
client.print("Hello World from Arduino!"); // Msg to publish
client.print("%22");
client.println(" HTTP/1.1");
client.print("Host: ");
client.println("pubsub.pubnub.com");
client.println();
}
else
{
Serial.println(F("Connection failed"));
}
I have read this page and understood that a correct GET request would be of the form:
GET /pub/WWW/TheProject.html HTTP/1.1
Host: www.w3.org
I am pretty sure there is something wrong with my GET request. Can anyone look at this and provide ANY hints as to what could be going wrong?

Answer 1

I am finally able to connect to PubNub using the code below.
#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#include <string.h>
#include "utility/debug.h"
#define ADAFRUIT_CC3000_IRQ 3 // MUST be an interrupt pin!
#define ADAFRUIT_CC3000_VBAT 5
#define ADAFRUIT_CC3000_CS 10
#define WLAN_SSID "XXXWifi"
#define WLAN_PASS "XXX"
#define WLAN_SECURITY WLAN_SEC_WPA2
#define IDLE_TIMEOUT_MS 3
uint32_t ip;
// PubNub Setup
#define WEBSITE "pubsub.pubnub.com"
#define WEBPAGE "/publish/"
char PUBKEY[] = "pub-XXXX";
char SUBKEY[] = "sub-XXXX";
Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT, SPI_CLOCK_DIVIDER); // you can change this clock speed
Adafruit_CC3000_Client www;
void setup(void)
{
Serial.begin(115200);
/* Initialize the module */
Serial.print(F("\n Initializing WIFI Adapter..."));
if (!cc3000.begin())
{
Serial.println(F("Couldn't begin()! Check your wiring?"));
while(1);
}
Serial.print(F("Ready!\n"));
Serial.print(F("Connecting to [")); Serial.print(WLAN_SSID);
Serial.print(F("]..."));
if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
Serial.println(F("Failed!"));
while(1);
}
Serial.print(F("Connected!\n"));
//Wait for DHCP to complete
Serial.print(F("Waiting for DHCP..."));
while (!cc3000.checkDHCP())
{
delay(100); // ToDo: Insert a DHCP timeout!
}
Serial.print(F("Done!\n"));
Serial.print(F("Resolving PubNub..."));
ip = 0;
// Try looking up the website's IP address
while (ip == 0) {
if (! cc3000.getHostByName(WEBSITE, &ip)) {
Serial.println(F("Couldn't resolve!"));
}
delay(500);
}
Serial.print(F("Resolved!\n"));
www = cc3000.connectTCP(ip, 80);
for(int i=0;i<=50;i++)
{
char buffer[4];
dtostrf(i, 4, 0, buffer);
Publish("ch2", buffer);
}
/* You need to make sure to clean up after yourself or the CC3000 can freak out */
/* the next time your try to connect ... */
Serial.println(F("\n\nDisconnecting"));
www.close();
cc3000.disconnect();
}
void loop(void)
{
delay(1000);
}
void Publish(char* CH, char* MSG)
{
if (www.connected()) {
www.fastrprint(F("GET "));
www.fastrprint(WEBPAGE);
www.fastrprint(PUBKEY);
www.fastrprint(F("/"));
www.fastrprint(SUBKEY);
www.fastrprint(F("/0/"));
www.fastrprint(CH);
www.fastrprint(F("/0/%22"));
www.fastrprint(MSG);
www.fastrprint(F("%22"));
www.fastrprint(F(" HTTP/1.1\r\n"));
www.fastrprint(F("Host: "));
www.fastrprint(WEBSITE);
www.fastrprint(F("\r\n"));
www.fastrprint(F("\r\n"));
www.println();
} else {
Serial.println(F("Connection failed"));
return;
}
//Read data until either the connection is closed, or the idle timeout is reached.
unsigned long lastRead = millis();
while (www.connected() && (millis() - lastRead < IDLE_TIMEOUT_MS)) {
while (www.available()) {
char c = www.read();
//Serial.print(c);
lastRead = millis();
}
}
}
char* clean(char* MSG)
{
return MSG;
}