@startuml Seq_Startup

title Real-time Data Transfer — Startup

participant "CAN Bus\n(SocketCAN)" as CANBUS
participant "Can::CanInterface" as CAN
participant "Can::MessageDispatcher" as DISP
participant "CloudConnectController" as CC
participant "MqttClient" as MQTT
participant "AWS IoT Core\n(MQTT broker)" as AWS

== CloudConnectController: signal → slot ==

note over CAN, MQTT
  CanInterface::didFrameReceive → CloudConnectController::onCanFrameReceive
  MessageDispatcher::didActionReceive → CloudConnectController::onCanMessageReceive
  MqttClient::didStateChanged → CloudConnectController::onCloudStateChanged
  MqttClient::didMessageStatusChanged → CloudConnectController::onCloudMessageStatusChanged
  MqttClient::didMessageReceived → CloudConnectController::onCloudMessageReceived
end note

== Configuration (on main thread) ==

CC -> CC : loadConfig(CloudConnect.ini)
CC -> CC : loadCanRouting(LeahiCanRouting.ini) → CAN mesg handling
CC -> MQTT : init(MqttClient::Config)\nbuild connection with cert/key/CA from CloudConnect.ini

== Bring-up (on controller thread) ==

CC -> MQTT :  open MQTT connection
CC -> CAN : open CAN connection
CAN -> CANBUS : open the SocketCAN device
MQTT -> AWS : CONNECT (create encrypted connection to host)
AWS --> MQTT : CONNACK
MQTT -> CC : didStateChanged(Connected)

@enduml