Rework Mqtt Implementation

api/src/main/resources/application.properties

@@ -19,13 +19,13 @@ server.ssl.key-store-type=PKCS12
 server.ssl.key-alias=board-mate-api
 
 #=============MQTT=============
-mqtt.broker-url=tcp://test.mosquitto.org:1883
-mqtt.client-id=board-mate-client
+mqtt.plain.broker-url=${BROKER_URL}
+mqtt.ssl.broker-url=${BROKER_SECURE_URL}
+mqtt.client-id=board-mate-api
 
-mqtt.topic=board-mate-test/topic
+mqtt.username=${BROKER_USERNAME}
+mqtt.password=${BROKER_PASSWORD}
 
-mqtt.username=yourUsername
-mqtt.password=yourPassword
 #=============METRICS=============
 management.endpoint.health.show-details=always
 management.endpoints.web.exposure.include=*