code: function(command, callback) {
  		command = 'curl https://api.spark.io/v1/devices/' + this.config.deviceId + '/' + command + '?access_token=' + this.config.token;
  		this.debug('Running command: ', command);
  		child = exec(command,
  			function (error, stdout, stderr) {
  			this.debug('stdout: ' + stdout);
  			this.debug('stderr: ' + stderr);
  			if (error !== null) {
  				this.debug('exec error: ' + error);
  			}
  			if (callback) {
  				try {
  					callback(JSON.parse(stdout));
  				}
  				catch (err) {
  					callback(undefined);
  				}
  			}
  		}.bind(this));
  	}
docs: Gets a variable from the spark core