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config: add support for lastWill and keep alive #468

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config: add support for lastWill and keep alive #468

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Commits on Sep 25, 2024

  1. config: add support for lastWill and keep alive 

    By default, MQTT keep-alive is 1200 seconds and AWS broker add a
1.5x factor, so it takes generally 15 min to discover that a device
is disconnected (30 min in the worst case)

This patch allow a user to configure a last will and change the
default timeout (30 seconds will be the minimum authorized by AWS)

New config will have for example:

	"last-will-topic": "things/myDevice/shadow/name/demo-shadow/update",
        "last-will-message": "{\"state\":{\"reported\":{\"connected\":false}}}",
        "connect-timeout": 0,
        "keep-alive": 30,
    @AmarOk1412
    AmarOk1412 committed Sep 25, 2024
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