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Added option to specify custom clientId for the MqttClient #89
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Hy @Hypfer , i made this pull request to allow specify a custom clientId for the MQTT client. The reason behind this that now (according to MQTT V5 specification) servers require a permanent clientId for each connected client.
The used Mqtt.js library default bhaviour is that the client generate a unique client id for the session during each connection, so this behaviour breaks the V5 auth mechanism, to fix this i allowd to specify a permanent clientId in the config.
This PR not breaks existing installations because when the config is not specified or the value is empty the library still generate random clientId`s as before, tested locally with every mentioned scenario.
The connection is also tested and verified using the VerneMq MQTT server.