Can't read analog messages via a handler

[anber500]

I'm trying to get the values from analog 0.

This works:

#--------------------------------------------------
from pyfirmata import Arduino, util
import pyfirmata

board = Arduino("COM7")
it = util.Iterator(board)
it.start()

board.analog[0].enable_reporting()

while True:
print board.analog[0].read()
#--------------------------------------------------

But why doesn't this work?

#--------------------------------------------------
from pyfirmata import Arduino, util
import pyfirmata

board = Arduino("COM7")
it = util.Iterator(board)
it.start()

def _analogHandler(*args):
    print board.analog[0].read()

board.analog[0].enable_reporting()
board.add_cmd_handler(pyfirmata.pyfirmata.ANALOG_MESSAGE, _analogHandler)
#--------------------------------------------------

Even though the tests.py passes the analog tests, it doesn't seem like you can receive messages when relying on the handler.