Add ie id enum

[chunmeng]

No description provided.

[ghost]

DeepCode's analysis on #f6962f found:

• ⚠️ 1 warning 👇

Top issues

Description	Example fixes
Potential nullptr dereference. 0 may return a nullptr if calloc failed to allocate memory. Consider adding a check for nullness. Occurrences: conf.c:323 conf.c:324 conf.c:328	🔧 Example fixes

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[grrtrr]

Hi thank you for the PR. This looks interesting. It is a larger change so may take a couple of iterations to integrate.

I am happy to look at this later.

[alicektx]

...was this closed by accident or something previously? :-/
The 2 extra filtering options can come up pretty handy for crowded environments,
and don't look much intrusive i'd think. Any thoughts grrtrr?

[grrtrr]

I didn't close this.

[alicektx]

...just noticed that 7919687 above,
assigns the 'h' shortcut for on-the-fly filtering of the 'hidden' essids:
such makes sense and is also very nice in terms of mnemonics, h for hidden,
but it appears to currently 'hijack' the current shortcut for help screen.
Not sure myself how someone should go about it eventually..

The band display filtering works pretty great though (thanks chunmeng!)
grrtrr, not really experienced with c / ncurses, some basic python skills here & there,
but i made a stripped down pull request of the band filtering feature,
in case you want to consider it for proper inclusion at some point.
I sincerely hope i'm not bothering you or wasting your time here,
and sorry in advance if such is the case...

[grrtrr]

@chunmeng - any comments on this?

[grrtrr]

...just noticed that 7919687 above, assigns the 'h' shortcut for on-the-fly filtering of the 'hidden' essids:

That is the reason I want to shelve this for a while. The sorting keyboard shortcuts are already difficult to memorize and handle.
The above one would conflict with h, while the ones in #77 would conflict with those of #76 (which is going to be added).
To resolve these, a separate way of setting up filters / sort options for the Scan Screen is needed; likely on a different screen.

[grrtrr]

@chunmeng - can you please re-submit your PR or get in contact?

I want to start integrating the work that you submitted, beginning at the header for IE enums, the display of extended capabilities, and then the filter options. As @alicektx 's Pull Request shows, there is still interest in your work. Please get in contact.