@startuml
skinparam sequenceMessageAlign center

participant "Gateway\n(Raspberry Pi)" as gw
participant "MQTT Broker\n(RabbitMQ)" as broker

== Startup ==
gw -> gw : load config.json
gw -> broker : connect (MQTTS, TLS, auth)
broker --> gw : connected
gw -> gw : start BLE scan

@enduml