Specify the URL of the broker to connect to.

As example :

Broker=tcp://localhost:1883

will connect to a broker on the same host (localhost) using MQTT default port (1883).

Specify this Marcel's instance identifier, which is by default Marcel. As each and every MQTT client needs to have an uniq ID over a network, this directive is useful if you're runing more than one Marcel.

Example :

ClientID=Marcel.dev

Makes Marcel crashing if it looses broker connection.