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libwebsockets/minimal-examples/http-client/minimal-http-client-captive-portal
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Andy Green b3131fdfdd cmakelist: Augean Stables refactor 
Establish a new distributed CMake architecture with CMake code related to
a source directory moving to be in the subdir in its own CMakeLists.txt.
In particular, there's now one in ./lib which calls through to ones
further down the directory tree like ./lib/plat/xxx, ./lib/roles/xxx etc.

This cuts the main CMakelists.txt from 98KB -> 33KB, about a 66% reduction,
and it's much easier to maintain sub-CMakeLists.txt that are in the same
directory as the sources they manage, and conceal all the details that that
level.

Child CMakelists.txt become responsible for:

 - include_directories() definition (this is not supported by CMake
   directly, it passes it back up via PARENT_SCOPE vars in helper
   macros)

 - Addition child CMakeLists.txt inclusion, for example toplevel ->
   role -> role subdir

 - Source file addition to the build

 - Dependent library path resolution... this is now a private thing
   in the child CMakeLists.txt, it just passes back any adaptations
   to include_directories() and the LIB_LIST without filling the
   parent namespace with the details
2020-05-27 08:40:12 +01:00
..
CMakeLists.txt cmakelist: Augean Stables refactor 2020-05-27 08:40:12 +01:00
minimal-http-client-captive-portal.c captive portal 2020-03-11 12:44:01 +00:00
README.md captive portal 2020-03-11 12:44:01 +00:00

README.md

lws minimal http client captive portal detect

This demonstrates how to perform captive portal detection integrated with lws_system states.

After reaching the lws_system DHCP state, the application tries to connect through to http://connectivitycheck.android.com/generate_204 over http... if it succeeds, it will get a 204 response and set the captive portal detection state to LWS_CPD_INTERNET_OK and perform a GET from warmcat.com.

If there is a problem detected, the captive portal detection state is set accordingly and the app will respond by exiting without trying the read from warmcat.com.

The captive portal detection scheme is implemented in the user code and can be modified according to the strategy that's desired for captive portal detection.

build

 $ cmake . && make

usage

$ ./bin/lws-minimal-http-client-captive-portal
[2020/03/11 13:07:07:4519] U: LWS minimal http client captive portal detect
[2020/03/11 13:07:07:4519] N: lws_create_context: using ss proxy bind '(null)', port 0, ads '(null)'
[2020/03/11 13:07:07:5022] U: callback_cpd_http: established with resp 204
[2020/03/11 13:07:07:5023] U: app_system_state_nf: OPERATIONAL, cpd 1
[2020/03/11 13:07:07:5896] U: Connected to 46.105.127.147, http response: 200
[2020/03/11 13:07:07:5931] U: RECEIVE_CLIENT_HTTP_READ: read 4087
[2020/03/11 13:07:07:5931] U: RECEIVE_CLIENT_HTTP_READ: read 4096
[2020/03/11 13:07:07:6092] U: RECEIVE_CLIENT_HTTP_READ: read 4087
[2020/03/11 13:07:07:6092] U: RECEIVE_CLIENT_HTTP_READ: read 4096
[2020/03/11 13:07:07:6112] U: RECEIVE_CLIENT_HTTP_READ: read 4087
[2020/03/11 13:07:07:6113] U: RECEIVE_CLIENT_HTTP_READ: read 4096
[2020/03/11 13:07:07:6113] U: RECEIVE_CLIENT_HTTP_READ: read 2657
[2020/03/11 13:07:07:6113] U: LWS_CALLBACK_COMPLETED_CLIENT_HTTP
[2020/03/11 13:07:07:6119] U: main: finished OK