tests/mqttd: extract the client id from the correct offset

Closes #6334

mqttd: fclose test file when done

Reported-by: Marc Hörsken
Reviewed-by: Jay Satiro
Bug: #6058
Closes #6189

curl.se: new home

Closes #6172

mqtt: improve the state machine

To handle PUBLISH before SUBACK and more.

Updated the existing tests and added three new ones.

Reported-by: Christoph Krey
Bug: https://

mqtt: improve the state machine

To handle PUBLISH before SUBACK and more.

Updated the existing tests and added three new ones.

Reported-by: Christoph Krey
Bug: https://curl.haxx.se/mail/lib-2020-04/0021.html
Closes #5246

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tests: introduce preprocessed test cases

The runtests script now always performs variable replacement on the
entire test source file before the test gets executed, and saves the
upda

tests: introduce preprocessed test cases

The runtests script now always performs variable replacement on the
entire test source file before the test gets executed, and saves the
updated version in a temporary file (log/test[num]) so that all test
case readers/servers can use that version (if present) and thus enjoy
the powers of test case variable substitution.

This is necessary to allow complete port number freedom.

Test 309 is updated to work with a non-fixed port number thanks to this.

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mqttd: s/errno/SOCKERRNO

To behave proper on Windows
Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/5e855bbd18f84a02c951be7cac6188276818cdac#r38507132
Closes #

mqttd: s/errno/SOCKERRNO

To behave proper on Windows
Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/5e855bbd18f84a02c951be7cac6188276818cdac#r38507132
Closes #5241

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tests: add the mqtt test server mqttd