digital input pins on arduino nano with standard firmata and pyfirmata are always 'None'

I have connected pin D2 on my arduino nano to high, and tried it out with an arduino c program and it works. However, when I load standard firmata onto the the controller from the arduino IDE and try the following python program:

import pyfirmata

board = pyfirmata.Arduino('/dev/ttyUSB0')

for x in range(2,14):
    print("%s %s" % (x, board.get_pin("d:%s:i" % x).read()))

I get this:

$ venv/bin/python test.py 
2 None
3 None
4 None
5 None
6 None
7 None
8 None
9 None
10 None
11 None
12 None
13 None

I can write digital pins with fermata and pyfirmata, but I can’t read.

I have also tried this:

import pyfirmata

board.digital[2].mode = pyfirmata.INPUT
board.digital[3].mode = pyfirmata.INPUT

for x in range(2,14):
    print("%s %s" % (x, board.digital[x].read()))

and other combinations, and always get None

(disconnecting the wire in the picture doesn’t change anything either)

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I have also just repeated the experiment with an arduino uno and get the same result

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so I guess my questions are:

• Can anybody spot anything obvious that I am doing wrong?
• Can anybody confirm that pyfirmata input ever works?
• What did you do that I am not doing?

it = pyfirmata.util.Iterator(board)
it.start()