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libwebsockets/minimal-examples/http-client/minimal-http-client-captive-portal
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Exact
Andy Green c9731c5f17 type comparisons: fixes 
This is a huge patch that should be a global NOP.

For unix type platforms it enables -Wconversion to issue warnings (-> error)
for all automatic casts that seem less than ideal but are normally concealed
by the toolchain.

This is things like passing an int to a size_t argument.  Once enabled, I
went through all args on my default build (which build most things) and
tried to make the removed default cast explicit.

With that approach it neither change nor bloat the code, since it compiles
to whatever it was doing before, just with the casts made explicit... in a
few cases I changed some length args from int to size_t but largely left
the causes alone.

From now on, new code that is relying on less than ideal casting
will complain and nudge me to improve it by warnings.
2021-01-05 10:56:38 +00:00
..
CMakeLists.txt cmake: latest cmake shows dep warnings for scripts < 2.8.12 2020-12-06 19:44:54 +00:00
minimal-http-client-captive-portal.c type comparisons: fixes 2021-01-05 10:56:38 +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