How to monitor the printer's event?

[DonkeyJason]

I have tried conn.createSubscription and pycups-notify package, they are both not working.
1 For the conn.createSubscription, my code is:
sub_id = conn.createSubscription( uri="ipp://localhost:631/printers/cups_new_printer_2", events=['all'], recipient_uri='http://localhost:8000/abc', )
It's always raise the error about "cups.IPPError: (1028, 'client-error-not-possible')".
It seems the recipient_uri is not correct, I tried the "ippget://localhost:8000/abc", "http://localhost:8000/abc", always not working.

2 Fot the pycuos-notify package, my code is:
`import cups
from cups_notify import Subscriber, event

def my_callback(evt):
print(evt)

def start_listener():
cups.setServer('127.0.0.1')
conn = cups.Connection()
sub = Subscriber(conn, '127.0.0.1')
sub.subscribe(
my_callback,
[
event.CUPS_EVT_JOB_COMPLETED, # Event when the job is completed
event.CUPS_EVT_JOB_CONFIG_CHANGED, # Event when the job is changed
event.CUPS_EVT_JOB_CREATED, # Event when a job is created
event.CUPS_EVT_JOB_PROGRESS, # Event for job progress
event.CUPS_EVT_JOB_STATE_CHANGED, # Event when the job-state changes
event.CUPS_EVT_JOB_STOPPED, # Event when the job is stopped
event.CUPS_EVT_PRINTER_ADDED, # Event when a printer is added
event.CUPS_EVT_PRINTER_CHANGED, # Event when a printer is changed
event.CUPS_EVT_PRINTER_CONFIG_CHANGED, # Event when a printer’s configuration is changed
event.CUPS_EVT_PRINTER_DELETED, # Event when a printer is deleted
event.CUPS_EVT_PRINTER_MODIFIED, # Event when a printer is modified
event.CUPS_EVT_PRINTER_STATE_CHANGED, # Event when the printer-state changes
event.CUPS_EVT_PRINTER_STOPPED, # Event when a printer is stopped
event.CUPS_EVT_SERVER_AUDIT, # Event when a bad request, security error, or authentication error occurs
event.CUPS_EVT_SERVER_RESTARTED, # Event when the server is restarted
event.CUPS_EVT_SERVER_STARTED, # Event when the server is initially started
event.CUPS_EVT_SERVER_STOPPED, # Event when the server is shutdown
]
)`
There is no result.

I don't think the conn.getJobs() is a perfect solution, so prefer the event monitor solution.

[dantetemplar]

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