Spark Core

Introduction

HTTP is a protocol that enables communications between clients and servers by setting up a request-response protocol between a client and server.

A web browser can be a client, and an application on a computer that hosts a web site could be a server. If this is the case the browser submits an HTTP request to the server; then the server returns a response to the client. The response contains status information about the request and may also contain the requested content.

HTTP Request Methods

GET - Requests data from a specified resource
POST - Submits data to be processed to a specified resource

The GET Method

When you use get, you send a query string in the URL (exposing your names/values:

/test/demo_form.asp?name1=value1&name2=value2

From w3schools:

GET requests can be cached
GET requests remain in the browser history
GET requests can be bookmarked
GET requests have length restrictions
GET requests should be used only to retrieve data

Using PHP with the Core

To use php, you will have to upload your php document to a server that can process it.

This tutorial allows you to control the core from a web page.

Your core should be running tinker. You just need to connect it to the web [breathing cyan].

The TinkerAPI is the default program, which provides basic functionality to control the analog and digital pins via REST API calls on the SparkCore cloud. When the SparkCore turns on, it connects to the Spark Cloud via Wi-Fi. The cloud exposes the functionality of the digital and analog pins via a collection of REST services. When these services are called in the cloud, the SparkCore makes the requested changes to its pin’s states or returns their values.
You will need to know two variables:
- your access token (find this in the build tool under SETTINGS or List all your tokens
```
GET /v1/access_tokens
```
```
# Using curl in your terminal
curl https://api.spark.io/v1/access_tokens \
    -u joe@example.com:SuperSecret
)
```
- your core's device id (find this in the build tool under CORES)

The way this works uses:

a form to set the D7 bit state
building the url from variables
Using the cURL function

<html>
<head>
<title>Spark LED on/off from php & form post</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="#FFFFFF">
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST")
	{
//level from the form post
	$level=$_POST["level"];
 
//replace with your access token, you can find this in the build page, under SETTINGS
$my_access_token="your_access_token"; 
$my_access_token=$_POST["my_access_token"];

//replace with your core device ID, you can find ID in the build page, under CORES
$my_device="your_device_id"; 
$my_device=$_POST["my_device"];

//this is the pin with the mini blue LED, so easy to test
	$output_pin="D7"; 

//some text just for reference to make sure things are going right
	echo("You set: " . $output_pin . ", " . $level . "<br><br>");
	echo("Below is the response from Cloud API:<br><br>");

//the important part, curl
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://api.spark.io/v1/devices/"+$my_device+"/digitalwrite");
curl_setopt($ch, CURLOPT_POST, 1);
	//The full data to post in a HTTP "POST" operation. To post a file, prepend a filename with @ and use the full path. 
	//The filetype can be explicitly specified by following the filename with the type in the format ';type=mimetype'. 
	//This parameter can either be passed as a urlencoded string like 'para1=val1¶2=val2&...' or as an array with the 
	//field name as key and field data as value. If value is an array, the Content-Type header will be set to multipart/form-data. 
	//As of PHP 5.2.0, value must be an array if files are passed to this option with the @ prefix.
	curl_setopt($ch, CURLOPT_POSTFIELDS,"access_token="+$my_access_token"+"¶ms=" . $output_pin . "," . $level);
	curl_exec ($ch);
	curl_close ($ch);
	}
?>
<br><br>
<FORM METHOD=POST enctype="multipart/form-data" ACTION="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<!--
Access Token: <input type="text" name="my_access_token" value="<?php echo($my_access_token);?>"><br>
Device ID: <input type="text" name="my_device" value="<?php echo($my_device);?>"><br>-->
<label for="level_high">HIGH</label><input type="radio" id="level_high" name="level" value="HIGH" checked="checked"/>
<label for="level_low">LOW</label><input type="radio" id="level_low" name="level" value="LOW"/>
<input type="Submit" name="Submit" value="Submit">
</form>
</body>
</html>

Another Web example

This tutorial is a customize-able simple Spark Core web app controller created by technobly. It is a derrivative of spark-helper.

Edit the index.html file and enter your coreID and accessToken in the user editable data area.
Here is the code for index.html:

<!DOCTYPE html>
<html>
  <head>
    <title>Super Simple Spark Core Controller</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
    
    <style type="text/css">
    .container {
  margin-top: 20px;
}

.input-group {
  margin-top:15px;
}

.alert {
  z-index: 1000;
}

.affix {
  width: 100%;
}

@media (min-width: 768px) {
 .affix {
    width: 720px;
  }
}

@media (min-width: 992px) {
 .affix {
    width: 940px;
  }
}

@media (min-width: 1200px) {
 .affix {
    width: 1140px;
  }
}
</style>

    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
      <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>

    <script type="text/javascript" src="http://codeorigin.jquery.com/jquery-2.0.3.min.js"></script>
    <script type="text/javascript" src="js/bootstrap.min.js"></script>
    <script>
      $(document).ready(function() {
        var statusTimer = null;
        var baseURL = "https://api.spark.io/v1/devices/";
        
        //--------------------------------------------------------------
        // START - EDITABLE USER DATA
        //
        var accessToken = "your access token";
        var coreID = "your device ID";
        // App Heading
        var appHeading = "My App";
        // Function 1
        var funcKey1 = "test";
        var args1 = "";
        var label1 = "Test 1"; // button label 1
        // Function 2
        var funcKey2 = "test";
        var args2 = "";
        var label2 = "Test 2"; // button label 2
        // Function 3
        var funcKey3 = "";
        var args3 = "";
        var label3 = ""; // button label 3
        // Function 4
        var funcKey4 = "test";
        var args4 = "";
        var label4 = "Test 4"; // button label 4
        //
        // END - EDITABLE USER DATA
        //--------------------------------------------------------------

        // Update app heading
        $("#app-heading").html(appHeading);

        // Update button labels to code definitions
        // or hide them if not defined.
        (label1) ? $("#button-1").html(label1) : $("#button-1").hide();
        (label2) ? $("#button-2").html(label2) : $("#button-2").hide();
        (label3) ? $("#button-3").html(label3) : $("#button-3").hide();
        (label4) ? $("#button-4").html(label4) : $("#button-4").hide();

        ////
        // Alerts
        ////
        $("#info-alert").alert();
        $("#info-alert").affix();

        ////
        // Methods
        ////
        // On method success
        function onMethodSuccess() {
          alert = $("#info-alert");
          alert.text("Success!").removeClass("alert-danger").addClass("alert-success");
          if(statusTimer != null) {
            clearTimeout(statusTimer);
            alert.hide();
            setTimeout(function() {
              alert.show();
              statusTimer = setTimeout(function() {
                statusTimer = null;
                alert.hide();
              }, 1750);
            }, 250);
          }
          else {
            alert.show();
            statusTimer = setTimeout(function() {
              statusTimer = null;
              alert.hide();
            }, 2000);
          }
        }

        function onMethodFailure(data) {
          alert = $("#info-alert");
          alert.text((data)?"Error! "+data:"Error!").removeClass("alert-success").addClass("alert-danger");
          if(statusTimer != null) {
            clearTimeout(statusTimer);
            alert.hide();
            setTimeout(function() {
              alert.show();
              statusTimer = setTimeout(function() {
                statusTimer = null;
                alert.hide();
              }, 1750);
            }, 250);
          }
          else {
            alert.show();
            statusTimer = setTimeout(function() {
              statusTimer = null;
              alert.hide();
            }, 2000);
          }
        }

        // The base level run method command
        function doMethod(method, data) {
          var url = baseURL + coreID + "/" + method;
          $.ajax({
            type: "POST",
            url: url,
            data: {
              access_token: accessToken,
              args: data
            },
            dataType: "json"
          }).success(function(obj) {
            console.log(obj);
            (obj.return_value && obj.return_value == 200) ? onMethodSuccess() : onMethodFailure((obj.error)?obj.error:"");
          }).fail(function(obj) {
            onMethodFailure();
          });
        }

        $("#button-1").on("click", function () {
          doMethod(funcKey1, args1);
        });
        $("#button-2").on("click", function () {
          doMethod(funcKey2, args2);
        });
        $("#button-3").on("click", function () {
          doMethod(funcKey3, args3);
        });
        $("#button-4").on("click", function () {
          doMethod(funcKey4, args4);
        });

      });
    </script> 

    <div class="container">
      <div class="panel panel-primary">
        <div class="panel-heading">
          <h4 class="panel-title" id="app-heading">
            Control
          </h4>
        </div>
        <div id="buttons" class="panel">
          <div class="panel-body">
            <button type="button" class="btn btn-primary btn-lg" id="button-1">BUTTON 1</button><br/><br/>
            <button type="button" class="btn btn-primary btn-lg" id="button-2">BUTTON 2</button><br/><br/>
            <button type="button" class="btn btn-primary btn-lg" id="button-3">BUTTON 3</button><br/><br/>
            <button type="button" class="btn btn-primary btn-lg" id="button-4">BUTTON 4</button>
          </div>
        </div>
      </div>
      <div class="alert fade in" id="info-alert" hidden data-spy="affix"></div>
    </div>
           
  </body>
</html>

You will also need to save the following js file in a directory named js in the same directory as index.html:

/*!
 * Bootstrap v3.0.3 (http://getbootstrap.com)
 * Copyright 2013 Twitter, Inc.
 * Licensed under http://www.apache.org/licenses/LICENSE-2.0
 */

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Create a new app on https://www.spark.io/build and call it "SparkController".

Copy/Paste the contents of the SparkController.cpp file over your new app.

bool state = HIGH;

void setup() {
    pinMode(D7,OUTPUT);
    digitalWrite(D7,HIGH); // turn on D7 by default
    Spark.function("test", testFunction);
}

void loop() {
	// do nothing
}

int testFunction(String args) {
    state = !state; // toggle the state
    digitalWrite(D7,state); // update the LED so we can see some action
    return 200; // This is checked in the web app controller for validation
}

Save it and Flash it to your Core.
Open the index.html in your browser or upload all files to your website at a secret URL and start controlling your Spark Core!
Customize it!

Enter a funcKey, args (if desired) and button label for each function you want to control.
Any button label that is defined such as label4 = "";, will automatically hide that button.
Name your app with the appHeading variable.
Edit your sketch with corresponding funcKeys and whatever control and logic you can dream up for your project.
You will see the "SUCCESS!" message pop up every time you press a button. It will say success on button presses only if it actually gets a return value of 200 from your function. If you Core goes offline and you press a button, you'll see an ERROR! Timed Out message.

Links:
christianloris

Introduction

The GET Method

Using PHP with the Core

Another Web example

Graphing

Parts

Controlling a servo

Parts