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1.5 KiB
1.5 KiB
lws minimal ws client
This connects to libwebsockets.org using the dumb-increment-protocol.
It demonstrates how to use the connection retry and backoff stuff in lws.
build
$ cmake . && make
Commandline Options
| Option | Meaning |
|---|---|
| -d | Set logging verbosity |
| -s | Use a specific server instead of libwebsockets.org, eg --server localhost. Implies LCCSCF_ALLOW_SELFSIGNED |
| -p | Use a specific port instead of 443, eg --port 7681 |
| -j | Allow selfsigned tls cert |
| -k | Allow insecure certs |
| -m | Skip server hostname check |
| -e | Allow expired certs |
| --protocol | Use a specific ws subprotocol rather than dumb-increment-protocol, eg, --protocol myprotocol |
usage
Just run it, it will connect to libwebsockets.org and spew incrementing numbers sent by the server at 20Hz
$ ./lws-minimal-ws-client
[2020/01/22 05:38:47:3409] U: LWS minimal ws client
[2020/01/22 05:38:47:4456] N: Loading client CA for verification ./libwebsockets.org.cer
[2020/01/22 05:38:48:1649] U: callback_minimal: established
[2020/01/22 05:38:48:1739] N:
[2020/01/22 05:38:48:1763] N: 0000: 30 0
[2020/01/22 05:38:48:1765] N:
...
To test against the lws test server instead of libwebsockets.org, run the test server as
$ libwebsockets-test-server -s
and run this test app with
$ ./lws-minimal-ws-client -s localhost -p 7681 -j
You can kill and restart the server to confirm the client connection is re- established if done within the backoff period.