Bootloading the Arduino over XBee ZB

I was playing with the XBee and Arduino again, and reading a lot of posts about how to bootload the Arduino wirelessly over the XBee. It was a fairly intricate process, involving among other things a custom bootloader. Now, it should be said that most of these posts were fairly dated, so there may be something that's changed. Because when I tried it, it worked on first try, with the default bootloader.. Mysteriously.

Setup: XBee Coordinator on XBee USB Explorer on COM5, XBee EndDevice on Arduino Mega.

(BTW, if you read my previous post, this will not work with the rerouted Serial. Put both jumpers to 'XBEE' on the XBee Shield)

Anyway, here's how I did it.

• Set up both XBee's to use 57600 baud.
• Upload .hex-file using AVRdude. Here is my cmdline:

 avrdude -Uflash:w:ledXBee.cpp.hex:i -cstk500v1 -P \\.\com5 -pm1280 -b 57600 -D

• At the precise moment you hit Enter, also press the reset-button on the Arduino. You may have to try a couple of times. Basically, methinks its because DTR isn't transmitted to the Arduino wirelessly, so you have to perform that duty yourself. I have an idea on how to fix it, but it requires some soldering..
• Done.

A screenshot may be in order:

Ok, so that works like a charm. I must explain that the XBee's are 4 inches apart, and the binary is less than 3K. I don't know if it'll scale in size or distance.

So, over to that last pesky bit, having to hit reset manually.. But that will have to wait to another day.