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# AVL AES Key Handling
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```plantuml
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@startuml
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participant "Device" as Dev
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participant "Device TCP Session" as Dev_TCP
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participant "D2Sphere TCP Session" as D2S_TCP 
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participant "D2Sphere Database" as D2S_DB
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participant "D2SPhere REST API" as D2S_API
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autonumber
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... any time ...
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Device <- Device : boot
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Device -> Dev_TCP : create TCP session
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... any time ...
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Device <- Device : boot
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Device -> Dev_TCP : create TCP session
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@enduml
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