added docs and tests for mqtt library, small fixes (removed warnings, option for custom outbox, websocket bug fixed for longer transports). refactored to use common tcp_transport component, support for CMake build system.
Closes#2108
- A bug of the http client when it downloads a chunked encoding packet is greater than the http_client's buffer, http_parser will call the callback body more than once, and the client will only handle the last
- with ssl_read, need to check before read to avoid timeout blocked when no data for reading
Add error handling for http client
set ssid password correct with Example_WIFI test, and clear password before free
Fixed the CI failure due to HTTP errror names
