Working with device drivers

Quflow example: Using a phone modem by defining a simple driver on-the-fly.
[python]
>>> from quflow import enter, exit, Driver, ports, sleep
>>> class Phone(Driver):
… commands = dict(attention = “AT”, call = “ATD%s”, hangup = “H0”)
… events = dict(ok = “OK”)
… procedures = dict(enter = “attention(), ok()”)
… expectEcho = True
…
>>> phonePort = ports()[2] # Assuming the third port controls the phone.
>>> phone = Phone(phonePort, timeout = 25)
>>> me = “+123456789” # My phone number – a global variable.
>>> enter(phone) # Beginning command-oriented usage.
Entering Phone(‘ASRL5::INSTR’)
Executing ‘attention(), ok()’ % ()
ASRL5::INSTR> AT
ASRL5::INSTR< AT
ASRL5::INSTR< OK
>>> # Items defined now affect only the phone object.
>>> procedure(trick = “call(‘%s’), sleep(15), no_carrier(), hangup()”)
>>> trick(me)
Executing “call(‘%s’), sleep(15), no_carrier(), hangup()” % (‘+123456789’,)
ASRL5::INSTR> ATD+123456789
ASRL5::INSTR< ATD+123456789
ASRL5::INSTR< NO CARRIER
ASRL5::INSTR> H0
ASRL5::INSTR< H0
>>> exit(phone) # Ending command-oriented usage.
Exiting Phone(‘ASRL5::INSTR’)
>>>
[/python]