Install:

protected/config/main.php
Please insert code in the next sections:

	...
	'import'=>array(
	...
			// yii-EasyAPNs
			'application.modules.yii-EasyAPNs.*',
	...
	),
	...
	'modules'=>array(
	...
			'easyapns'=>array(
				'class'=>'application.modules.yii-EasyAPNs.EasyAPNsModule',
				'development' => 'sandbox', // sandbox, production
			),
	...
	),
	..

SQL:
DROP TABLE IF EXISTS `tbl_apns_device_history`;
CREATE TABLE `tbl_apns_device_history` (
  `pid` INT(9) UNSIGNED NOT NULL AUTO_INCREMENT,
	`clientid` VARCHAR(64) NOT NULL DEFAULT '0',
  `appname` VARCHAR(255) NOT NULL,
  `appversion` VARCHAR(25) DEFAULT NULL,
  `deviceuid` CHAR(40) NOT NULL,
  `devicetoken` CHAR(64) NOT NULL,
  `devicename` VARCHAR(255) NOT NULL,
  `devicemodel` VARCHAR(100) NOT NULL,
  `deviceversion` VARCHAR(25) NOT NULL,
  `pushbadge` ENUM('disabled','enabled') DEFAULT 'disabled',
  `pushalert` ENUM('disabled','enabled') DEFAULT 'disabled',
  `pushsound` ENUM('disabled','enabled') DEFAULT 'disabled',
  `development` ENUM('production','sandbox') CHARACTER SET latin1 NOT NULL DEFAULT 'production',
  `status` ENUM('active','uninstalled') NOT NULL DEFAULT 'active',
  `archived` DATETIME NOT NULL,
  PRIMARY KEY (`pid`),
  KEY `devicetoken` (`devicetoken`),
  KEY `devicename` (`devicename`),
  KEY `devicemodel` (`devicemodel`),
  KEY `deviceversion` (`deviceversion`),
  KEY `pushbadge` (`pushbadge`),
  KEY `pushalert` (`pushalert`),
  KEY `pushsound` (`pushsound`),
  KEY `development` (`development`),
  KEY `status` (`status`),
  KEY `appname` (`appname`),
  KEY `appversion` (`appversion`),
  KEY `deviceuid` (`deviceuid`),
  KEY `archived` (`archived`)
) ENGINE=MYISAM DEFAULT CHARSET=utf8 COMMENT='Store unique device history';

DROP TABLE IF EXISTS `tbl_apns_devices`;
CREATE TABLE `tbl_apns_devices` (
  `pid` INT(9) UNSIGNED NOT NULL AUTO_INCREMENT,
  `clientid` VARCHAR(64) NOT NULL DEFAULT '0',
  `appname` VARCHAR(255) NOT NULL,
  `appversion` VARCHAR(25) DEFAULT NULL,
  `deviceuid` CHAR(40) NOT NULL,
  `devicetoken` CHAR(64) NOT NULL,
  `devicename` VARCHAR(255) NOT NULL,
  `devicemodel` VARCHAR(100) NOT NULL,
  `deviceversion` VARCHAR(25) NOT NULL,
  `pushbadge` ENUM('disabled','enabled') DEFAULT 'disabled',
  `pushalert` ENUM('disabled','enabled') DEFAULT 'disabled',
  `pushsound` ENUM('disabled','enabled') DEFAULT 'disabled',
  `development` ENUM('production','sandbox') CHARACTER SET latin1 NOT NULL DEFAULT 'production',
  `status` ENUM('active','uninstalled') NOT NULL DEFAULT 'active',
  `created` DATETIME NOT NULL,
  `modified` TIMESTAMP NOT NULL DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP,
  `os` VARCHAR(32) DEFAULT '''iphone''',
  PRIMARY KEY (`pid`),
  UNIQUE KEY `appname` (`appname`,`appversion`,`deviceuid`),
  KEY `devicetoken` (`devicetoken`),
  KEY `devicename` (`devicename`),
  KEY `devicemodel` (`devicemodel`),
  KEY `deviceversion` (`deviceversion`),
  KEY `pushbadge` (`pushbadge`),
  KEY `pushalert` (`pushalert`),
  KEY `pushsound` (`pushsound`),
  KEY `development` (`development`),
  KEY `status` (`status`),
  KEY `created` (`created`),
  KEY `modified` (`modified`)
) ENGINE=MYISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 COMMENT='Store unique devices';

CREATE TRIGGER `APNsArchive` BEFORE UPDATE ON `tbl_apns_devices` FOR EACH ROW INSERT INTO `tbl_apns_device_history` VALUES (
    NULL,
		OLD.`clientid`,
    OLD.`appname`,
    OLD.`appversion`,
    OLD.`deviceuid`,
    OLD.`devicetoken`,
    OLD.`devicename`,
    OLD.`devicemodel`,
    OLD.`deviceversion`,
    OLD.`pushbadge`,
    OLD.`pushalert`,
    OLD.`pushsound`,
    OLD.`development`,
    OLD.`status`,
    NOW()
);;
DELIMITER ;

DROP TABLE IF EXISTS `tbl_apns_messages`;
CREATE TABLE `tbl_apns_messages` (
  `pid` INT(9) UNSIGNED NOT NULL AUTO_INCREMENT,
  `clientid` INT(11) DEFAULT NULL,
  `fk_device` INT(9) UNSIGNED NOT NULL,
  `message` TEXT NOT NULL,
  `delivery` DATETIME NOT NULL,
  `status` ENUM('queued','delivered','failed') CHARACTER SET latin1 NOT NULL DEFAULT 'queued',
  `created` DATETIME NOT NULL,
  `modified` TIMESTAMP NOT NULL DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`pid`),
  KEY `fk_device` (`fk_device`),
  KEY `status` (`status`),
  KEY `created` (`created`),
  KEY `modified` (`modified`),
  KEY `delivery` (`delivery`)
) ENGINE=MYISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 COMMENT='Messages to push to APNS';

Befor use easyapns, you must registered your devices.
Example:
http://server.com/server/easyapns/apns/?task=register&clientid=123&appname=My%20App&appversion=1.0.1&deviceuid=[Device uid]&devicetoken=[Device token]&devicename=My%20Awesome%20iPhone&devicemodel=iPhone&deviceversion=3.1.2&pushbadge=enabled&pushalert=disabled&pushsound=enabled

For push message you can use:
	<?php
	$ids = array(1,2,3,4);
	$message = 'Some text';
	$easyapns = Yii::app()->getModule('easyapns');
	$easyapns->CreateMessage( $ids );
	$easyapns->AddMessage($message);
	$easyapns->AddMessageBadge();
	$easyapns->AddMessageSound();
	$easyapns->PushMessages();
	?>

Additional methods: 
http://server.com/server/easyapns/apns/?task=fetch
http://server.com/server/easyapns/apns/?task=flush

More description you can find: http://www.easyapns.com