Encoding NAS5G messages - syntax help needed

[slashTPA]

Hi there,

I somehow struggle to instantiate NAS5G messages. E.g. trying:

Msg = 5GMMRegistrationAccept()

gives only back : SyntaxError: invalid syntax

I failed to find the right syntax in 5G case (working well in 3G). Any hint would be appreciated. Thx. Do I need to define myself in TS24501_FGSM.py this mapping (?)

all = [

]

[p1-bmu]

Hello, in Python, variables cannot start with an alphanumeric character. Therefore, all "5G" related structures and classes are prefixed "FG", as you can see from the source code, e.g.: https://github.com/P1sec/pycrate/blob/383fd140a60ab5ada688aaec73a122117c879b80/pycrate_mobile/TS24501_FGMM.py#L152

Otherwise, there is no specific difference compared to 2-3-4G NAS protocols, as you can see from the wiki: https://github.com/P1sec/pycrate/wiki/Mobile-nas-messages

[slashTPA]

Well, still I don't see the relation. If I do a:

Msg, err = parse_NAS5G(unhexlify('2e0501c1ffff91a1')) print(Msg.show()) I get a decoding as 5GSMPDUSessionEstabRequest

Running then something like: Msg = FGSMPDUSessionEstabRequest() ends up in: NameError: name 'FGSMPDUSessionEstabRequest' is not defined

while in the 'old' world it worked like: Msg = MMLocationUpdatingRequest() print(Msg.show()) and I get the default MMLocationUpdatingRequest (with with mandatory IEs)

That is what I'd like to achive for 5G as well...

[p1-bmu]

As you can see from the source code: https://github.com/P1sec/pycrate/blob/383fd140a60ab5ada688aaec73a122117c879b80/pycrate_mobile/NAS5G.py#L32 Only FGMMTypeClasses and co. are imported in the NAS5G module.

If you want to access all 5G NAS message classes directly, you can import them explicitly:

from pycrate_mobile.TS24501_FGMM import *
from pycrate_mobile.TS24501_FGSM import *

[slashTPA]

Thank you very much. This was the missing piece of info for me.