Adding a retain flag supported by mqtt in the gateway and status topi…#237

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LePailleurThibault wants to merge 3 commits intomasterfrom

Commits on Jan 3, 2023

Adding a retain flag supported by mqtt in the gateway and status topics in mqtt.
LePailleurThibault
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fix of PR#237
LePailleurThibault
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Adding the thread to publish periodically gw status (from gateway_status branch to suppress it and simplify branches) + PR#236
LePailleurThibault
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