How to automatically do org-mobile-push org-mobile pull in emacs

Since I am using org-mode to track my todo list in emacs, I like the iPhone app: MobileOrg, with it, I can access my todo list all day.

But here's the problem:

I have to manually org-mobile-push my changes from local file to mobile phone through dropbox, and org-mobile-pull the changes made by phone back.

How to make that automatically? Like adding some recipes in dotemacs file.

Solution

Add these two lines to dot emacs file:

(add-hook 'after-init-hook 'org-mobile-pull)
(add-hook 'kill-emacs-hook 'org-mobile-push)

With them, it automatically pulls the changes on emacs startup, and pushes the changes before emacs exits.

-- Update

If you never exit your Emacs, this solution might not work for you. So, another solution using idle timer

;; moble sync
(defvar org-mobile-sync-timer nil)
(defvar org-mobile-sync-idle-secs (* 60 10))
(defun org-mobile-sync ()
  (interactive)
  (org-mobile-pull)
  (org-mobile-push))
(defun org-mobile-sync-enable ()
  "enable mobile org idle sync"
  (interactive)
  (setq org-mobile-sync-timer
        (run-with-idle-timer org-mobile-sync-idle-secs t
                             'org-mobile-sync)));
(defun org-mobile-sync-disable ()
  "disable mobile org idle sync"
  (interactive)
  (cancel-timer org-mobile-sync-timer))
(org-mobile-sync-enable)

I just found out it is same as below answer, so, if you prefer the idle timer solution, please upvote tkf's answer.