Pubnub Arduino SDK code sample for ESP8266. Demonstrates publish and subscribe. Get your unique PubNub keys from the PubNub Developer Portal (https://admin.pubnub.com/?devrel_gh=PubNub-UV-Index-Monitor ). If you don't have a PubNub account, you can sign up for a PubNub account for free (https://dashboard.pubnub.com/signup/?devrel_gh=PubNub-UV-In…

pubnub-ESP8266.ino

#include <ESP8266WiFi.h>
#define PubNub_BASE_CLIENT WiFiClient
#include <PubNub.h>
 
const char* ssid     = "YourSSID";
const char* password = "YourPASSWORD";
const char* channelName = "hello_world";

void setup() {
    Serial.begin(9600);
    WiFi.begin(ssid, password);
    if(WiFi.waitForConnectResult() == WL_CONNECTED){
      PubNub.begin("demo", "demo");
    } else {
      Serial.println("Couldn't get a wifi connection");
      while(1) delay(100);
    }
}
 
void loop() {
    PubNub_BASE_CLIENT *client;
 
    Serial.println("publishing a message");
    client = PubNub.publish(channelName, "\"\\\"Hello world!\\\" from Arduino.\"");
    if (!client) {
        Serial.println("publishing error");
        delay(1000);
        return;
    }
    while (client->connected()) {
        while (client->connected() && !client->available());
        char c = client->read();
        Serial.print(c);
    }
    client->stop();
    Serial.println();
 
    Serial.println("waiting for a message (subscribe)");
    PubSubClient *pclient = PubNub.subscribe(channel);
    if (!pclient) {
        Serial.println("subscription error");
        delay(1000);
        return;
    }
    while (pclient->wait_for_data()) {
        char c = pclient->read();
        Serial.print(c);
    }
    pclient->stop();
    Serial.println();
}