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46 lines
1.8 KiB
Markdown
46 lines
1.8 KiB
Markdown
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# lws minimal http client captive portal detect
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This demonstrates how to perform captive portal detection integrated
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with `lws_system` states.
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After reaching the `lws_system` DHCP state, the application tries to
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connect through to `http://connectivitycheck.android.com/generate_204`
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over http... if it succeeds, it will get a 204 response and set the
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captive portal detection state to `LWS_CPD_INTERNET_OK` and perform
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a GET from warmcat.com.
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If there is a problem detected, the captive portal detection state is
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set accordingly and the app will respond by exiting without trying the
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read from warmcat.com.
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The captive portal detection scheme is implemented in the user code
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and can be modified according to the strategy that's desired for
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captive portal detection.
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## build
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```
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$ cmake . && make
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```
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## usage
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```
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$ ./bin/lws-minimal-http-client-captive-portal
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[2020/03/11 13:07:07:4519] U: LWS minimal http client captive portal detect
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[2020/03/11 13:07:07:4519] N: lws_create_context: using ss proxy bind '(null)', port 0, ads '(null)'
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[2020/03/11 13:07:07:5022] U: callback_cpd_http: established with resp 204
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[2020/03/11 13:07:07:5023] U: app_system_state_nf: OPERATIONAL, cpd 1
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[2020/03/11 13:07:07:5896] U: Connected to 46.105.127.147, http response: 200
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[2020/03/11 13:07:07:5931] U: RECEIVE_CLIENT_HTTP_READ: read 4087
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[2020/03/11 13:07:07:5931] U: RECEIVE_CLIENT_HTTP_READ: read 4096
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[2020/03/11 13:07:07:6092] U: RECEIVE_CLIENT_HTTP_READ: read 4087
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[2020/03/11 13:07:07:6092] U: RECEIVE_CLIENT_HTTP_READ: read 4096
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[2020/03/11 13:07:07:6112] U: RECEIVE_CLIENT_HTTP_READ: read 4087
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[2020/03/11 13:07:07:6113] U: RECEIVE_CLIENT_HTTP_READ: read 4096
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[2020/03/11 13:07:07:6113] U: RECEIVE_CLIENT_HTTP_READ: read 2657
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[2020/03/11 13:07:07:6113] U: LWS_CALLBACK_COMPLETED_CLIENT_HTTP
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[2020/03/11 13:07:07:6119] U: main: finished OK
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```
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