var Web3 = require('web3');
if (typeof web3 !== 'undefined')
{
    web3 = new Web3(web3.currentProvider);
}else
{
    web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:9002")); 
    //http-rpc-port
}
var Gpio = require('onoff').Gpio; 
var led = new Gpio(21,'out');
var coinbase = web3.eth.coinbase;
var ABIString = '[{"constant":false,"inputs":[{"name":"x","type":"uint8"}],"name":"getRent","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"returnValue","type":"bool"}],"name":"roomRented","type":"event"}]';
var ABI = JSON.parse(ABIString);
var ContractAddress = '0x975881c44fbef4573fef33cccec1777a8f76669c';
web3.eth.defaultAccount = web3.eth.accounts[0];
var simpleiot = web3.eth.contract(ABI).at(ContractAddress);
var event = simpleiot.roomRented( {}, function(error, result) { if (!error)
{
    console.log("LED On");
    led.writeSync(1);
}
});