ibm-bluemix-mqtt-arduino.ino

/*
 Basic MQTT example with Authentication

 How to send MQTT data to IBM Bluemix from Intel Edison via Arduino.
 
 by Rex St. John
*/

#include <SPI.h>
#include <WiFi.h>
#include <PubSubClient.h>

// WiFi Login
char ssid[] = "YOUR_SSID";      //  your network SSID (name)
char pass[] = "YOUR_PASSWORD";             // your network password

// IBM Bluemix Info
char orgName[] = "YOUR_ORG";      // Your org name, found under the "Credentials" area in your Bluemix dashboard.
char macstr[] = "YOUR_MAC"; // The MAC address of your Arduino gadget, update this to match your own.
char server[] = "[YOUR_ORG].messaging.internetofthings.ibmcloud.com"; // MQTT Host (taken from Bluemix dashboard)
char type[] = "DEVICE_TYPE";    // Type of device you have registered in the IBM Bluemix Devices area.
char token[] = "DEVICE_AUTH_TOKEN"; // Token issued when you first register your IoT device (only appears once)
int port = 1883;

String clientName = buildClientName();
String topicName = String("iot-2/evt/status/fmt/json"); // Topic

// WiFi connection
WiFiClient wifiClient;
int status = WL_IDLE_STATUS;          // the Wifi radio's status

// PubSub Client.
PubSubClient client(server, port, 0 , wifiClient);

void setup()
{
  Serial.begin(9600);
  status = WiFi.begin(ssid, pass);
  if(status == WL_CONNECTED){
    Serial.println("WiFi Connected!");
  } else {
    Serial.println("WiFi Failed!");
  }
}

void loop()
{
  char clientStr[34];
  clientName.toCharArray(clientStr,34);
  char topicStr[26];
  topicName.toCharArray(topicStr,26);
  
  if (!client.connected()) {
    Serial.print("Trying to connect to: ");
    Serial.println(clientStr);
    client.connect(clientStr, "use-token-auth", token);
  }
  if(client.connected()) {
       Serial.println("Success getting online...Begin transmit...");

      // Build the JSON data to publish.
      String json = buildJson();
      char jsonStr[200];
      json.toCharArray(jsonStr,200);

      // Publish the data.
      boolean pubresult = client.publish(topicStr,jsonStr);
      Serial.print("attempt to send ");
      Serial.println(jsonStr);
      Serial.print("to ");
      Serial.println(topicStr);

      if (pubresult)
        Serial.println("successfully sent");
      else
        Serial.println("unsuccessfully sent");
  }
  delay(5000);
}

// Builds the clientName
String buildClientName (){
  String data = "";
  data+="d:";
  data+=orgName;
  data+=":";
  data+=type;
  data+=":";
  data+=macstr;
  return data;
}

// Sends the string: {d:{"Voltage" : "5"}} to Bluemix
String buildJson() {
  String data = "{";
  data+="\n";
  data+= "\"d\": {";
  data+="\n";
  data+="\"Volts\": 5"; // Note: wrap like \"5\" for a string, this is a number we are sending.
  data+="\n";
  data+="}";
  data+="\n";
  data+="}";
  return data;
}

Great job man!
You might want to put the buildClientName() in the header to avoid compilation error.

Hello, I have an error with the "buildClientName()". What should I do?
@saoron: What do you mean put it in the header? What is the header?

hello , i have the same issue as @JojoMojoe , is there a solution ?