In [17]: token = 'com.apple.mgmt.mobsafety.sandbox.device'

In [18]: payload = {'mdm':'372A55DA-E93B-4E89-9F91-264BA1B1E18C'}

In [19]: certificate =  '/Users/gerrrr/Work/curupira/apns-dis/apnsdis/APNS-certs/mobspro-apns.cer.pem'

In [20]: os.path.exists(certificate)
Out[20]: True

In [21]: sandbox = True

In [22]: result = send_command(SimpleNotificationCommand, token, payload, certificate, keyfile=keyfile, sandbox=sandbox)

In [23]: result
Out[23]: True