# pmsg - PocketPC messenger idea

pocket messenger
Chat through bluetooth, Wi-Fi, IrDA
More of a learning project than anything useful (use IRC, XMPP, email...)

**Ideea:** on first launch program should prompt you to make a (device-local) user account.

The program will need a local cache directory: make it in the current running directory (most likely program files) and put stuff there.

That user account will be local only and will contain:
- Username (doesn't have to be unique since we can't track it anyway)
- - ID
-     - How we actually track users between conversations; **This must be unique**
-     - Maybe generate it from Wi-Fi mac address + device name? Something like that
-     - Or get it from device S/N, anything identifiable
-     - Hash it and send it along with any message
- - Profile picture
-     - Something small with reduced colors, probably 64x64 and 4-bit colour
-     - Send this along at the start of the chat maybe to reduce bandwidth needs?
-         - If somebody joins in a group chat after a user they won't see their profile picture
-         - Solution: Just send it (announce it, like a gratuitous ARP) whenever someone joins
-         - This could cause performance problems if there are a lot of people in a group chat and everybody sends their profile picture
-         - First, the client will have to check if they have a locally cached version of a user's profile picture based on their ID
-             - `Program: Do I have this profile picture in my cache directory?`
-             - `Program: If I do, I won't ask for a profile picture`
-         - Whenever a user changes their profile picture, they will announce it after a random amount of time to reduce bandwidth needs.