sparkcloud

Read and control your Spark Core with node.js using the Particle Cloud API.

• Particle
• API documentation
• node.js

Installation

Stable: npm install sparkcloud

Develop: npm install fvdm/nodejs-spark#develop

Configuration

When you load the module into your script you must provide the access_token from your account settings.

var spark = require ('sparkcloud') ('your_access_token');

Optionally you can override the default HTTP request timeout of 10 seconds, in milliseconds:

// set timeout to 30 seconds
var spark = require ('sparkcloud') ('your_access_token', 30000);

Callback & errors

The last parameter of each method must be the callback function. This is the only way to receive results as the functions themselves don't return anything.

function myCallback (err, data) {
  if (!err) {
    console.log ('We got data: ', data);
  } else {
    console.log (err);
  }
}

The first parameter err is null when all went fine, otherwise it is an instanceof Error. Depending on the kind of error it may have additional properties to further explain the problem.

Errors

message	description	additional
request failed	The request had an error	err.error
api error	API returned an error	err.code, err.error, err.error_description

devices ( callback )

List all cores linked to your account.

spark.devices (console.log);

[
  {
    id: '123456789',
    name: 'myCore',
    last_app: null,
    connected: true
  }
]

events ( onMessage, [onError], [onOpen] )

Listen for events on your entire account, included events from all your devices.

See device.events below for details.

spark.events (console.log);

device ( deviceId )

Get core specific methods.

var core = spark.device ('123456789');

Returns device methods below, no callback.

Connect multiple cores

var coffee = spark.device ('12345');
var alarm = spark.device ('67890');

// Make delicious coffee and wake me up after 5 min
coffee.makeCoffee ();
alarm.wakeMeUp (5);

device.info ( callback )

Get basic information about a core including its functions and variables.

core.info (console.log);

{
  id: 'abc123',
  name: 'Spark Core',
  connected: true,
  variables:
    {
      ledState: 'int32'
    },
  functions:
    [
      'led'
    ],
  cc3000_patch_version: '1.28',
  product_id: 0,
  last_heard: '2015-06-25T06:19:18.824Z'
}

device.variable ( varName, callback )

Read a variable from the core.

core.variable ('ledState', console.log);

{
  cmd: 'VarReturn',
  name: 'ledState',
  result: 0,
  coreInfo:
    {
      last_app: '',
      last_heard: '2015-06-25T06:17:48.022Z',
      connected: true,
      last_handshake_at: '2015-06-25T06:00:24.099Z',
      deviceID: 'abc123'
    }
}

device.func ( functionName, [param], callback )

Run a function on the core. Optionally include one parameter.

core.func ('led', 'on', console.log);

{
  id: 'abc123',
  last_app: '',
  connected: true,
  return_value: 0
}

device.events ( onMessage, [onError], [onOpen] )

Listen to realtime events published from the core.

function message (ev) {
  console.log (ev.event);
  console.log (ev.data);
}

function error (err) {
  console.log ('Events error:');
  console.log (err);
}

// Switch LED every 5 seconds
core.events (message, error, function () {
  setInterval (function () {
    core.func ('switchLED');
  }, 5000);
});

Output

{
  type: 'message',
  event: 'LED off',
  data: 
   {
     data: 'From 1',
     ttl: '10',
     published_at: '2015-06-25T10:39:03.521Z',
     coreid: 'abc123'
   },
  lastEventId: '',
  origin: 'https://api.particle.io'
}

Hint: when you publish JSON data (string) from your device it will be decoded too.

Example

If you send the following code to you Spark core, the javascript example should work fine.

Spark code

int LED = D7;
int State = 0;

void setup() {
  pinMode (LED, OUTPUT);
  Spark.function ("led", switchLED);
  Spark.variable ("ledState", &State, INT);
}

int switchLED (String args) {
  if (args.length () >= 1) {
    State = args == "on" ? 0 : 1;
  }
  digitalWrite (LED, State == 1 ? LOW : HIGH);
  return State = State == 1 ? 0 : 1;
}

Node javascript

var spark = require ('sparkcloud') ('your_access_token');
var core = spark.device ('123456789');

// just switch on/off
core.func ('led', console.log);

// force on
core.func ('led', 'on', console.log);

Each time you run this script the blue LED next to the big RGB LED should switch on or off.

Enjoy!

Unlicense

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to http://unlicense.org

Author

Franklin van de Meent