sendussd AttributeError: 'NoneType' object has no attribute 'group' about python-gsmmodem HOT 10 OPEN

copied from faucamp#43 - just stumbled about this fork by accident but am not actively using the library anymore, so I am unlikely to be of much further help - sorry

According to the GSM spec, USSD responses can have the following status codes:

0 no further user action required (network initiated USSD-Notify, or no further information needed after mobile initiated operation)
1 further user action required (network initiated USSD-Request, or further information needed after mobile initiated operation)
2 USSD terminated by network
3 other local client has responded
4 operation not supported
5 network time out

I've never seen 0 or 3, but the 4s and 5s don't have any message text fields (e.g. +CUSD: 4).
This response isn't matched by the cusd regex, which leads to a nullpointer exception in parseCusdResponse.

Also, having access to the statuscodes would be nice, to be able to differentiate between a network timeout and unsopperted operation.

I've made a rough patch which changes the second regex group to optional (improvements welcome...), adds the statuscode as variable to USSD() and changes sessionActive to a property.

However, I am unsure how to adapt this if block. It looks to me like that is basically setting the message to the last CUSD indication with statuscode !=2. Is that really intended behaviour? Because in the "normal" case, statuscode 2 is what you get for succesfull "oneshot" USSD commands (e.g. checking credit).

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Hi jthurner, it seems that I missed your USSD-statuscode-fixes branch in your repo. Is it safe to merge your commit?

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hi @jthurner and @babca what is the best way to fix this problem?
should i use @jthurner's fork?

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I merged his code into my USSD-statuscode-fixes branch. Please test this: https://github.com/babca/python-gsmmodem/tree/USSD-statuscode-fixes

If it will work, I will merge it to master.

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doesn't seem to work
first try it doesn't show response properly

Initializing modem...
Sending USSD string: *888#
USSD reply received:
+CGREG: 2
USSD session was ended by

second try i got error

Initializing modem...
Process Process-2:
Traceback (most recent cal
File "C:\Python27\lib\mu
self.run()
File "C:\Python27\lib\mu
self._target(*self._ar
File "D:\Work Data\Serve
modem.waitForNetworkCo
File "build\bdist.win32
erage
raise TimeoutException
TimeoutException: None

third try

Initializing modem..
Sending USSD string:
None

fourth try the device just become unusable like some other program is using it

could not open port u'com3': WindowsError(5, 'Access is denied.')

fifth

Initializing modem...
Sending USSD string: *888#
USSD reply received: None
USSD session was ended by network.

from python-gsmmodem.

Well I'm not on PC at the moment to test it myself, it would be needed to setup a logger and see what is going on. You can setup the logger to stdout/stderr, or to a file (set the log level to debug and show the live log with a command $ tail -f /tmp/path/to/my/logfile.log) and see an actual communication with the modem.

I will try to help, but I have two weeks of vacation now. :-)

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here is the AT command log when the error occur

http://pastebin.com/mSQH7rZe

the response is
DEBUG: write: AT+CUSD=1,"*111#",15
DEBUG: response: ['OK']
DEBUG: notification: ['+CUSD: 4']

meanwhile the non-error response is
DEBUG: write: AT+CUSD=1,"*111#",15
DEBUG: response: ['OK']
DEBUG: notification: ['+CUSD: 1,"Bal: Rp 2000.0\n1. Info pulsa/internet hemat\n2. Bonus Pulsa\n3. Isi Ulang Promo\n4. Cek Kuota\n5. Cek Pulsa Internet\n6. Yuk Solat\n7. Mau Cepat Kaya?\n8. Facebook",15']
DEBUG: write: AT+CUSD=2
DEBUG: response: ['OK']

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ups sorry misclicked the comment button

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Initializing modem...
Sending USSD string: *888#
USSD reply received:
+CGREG: 2
USSD session was ended by

The regex in the patch is rubbish, then. I'll fix this, though it may take another weak or so because I'm rather tied up with work atm.

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for now all i can do is this

#sessionActive = cusdMatches[0].group(1) == '1'
sessionActive = False
#message = cusdMatches[0].group(2)
message = lines

just so it doesn't crash and stop the script but still return the response

updated version

#sessionActive = cusdMatches[0].group(1) == '1'
linesJoined = ''.join(lines)
sessionEnd = linesJoined.startswith('+CUSD: 2')
if sessionEnd:
    sessionActive = False
#message = cusdMatches[0].group(2)
message = lines

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