AVL AES Key Handling

sequenceDiagram
    participant Dev as "Device"
    participant Dev_TCP as "Device TCP Session"
    participant D2S_TCP as "D2Sphere TCP Session"
    participant D2S_DB as "D2Sphere Database"
    participant D2S_API as "D2SPhere REST API"

    %%Note over Dev,Dev_TCP,D2S_TCP,D2S_DB,D2S_API: create D2Sphere TCP conncetion
    autonumber
    Dev->>Dev_TCP: create TCP session
    Dev_TCP->>D2S_TCP: sent Login plain (contains uuid/IMEI and used enryption mode)
    Dev->>Dev_TCP : load AES key from TPM key store to AES module
    Dev_TCP->> Dev_TCP : start using enryption
    Dev_TCP->>Dev_TCP : parse Login, mode, uuid
    D2S_DB->>Dev_TCP : load AES key for uuid
    D2S_TCP->>D2S_TCP : start using enryption
    Dev_TCP->D2S_TCP: excahnge data
    Dev_TCP->D2S_TCP: excahnge data
    %%Note over Dev,Dev_TCP,D2S_TCP,D2S_DB,D2S_API: key change via REST API
    Dev_TCP->D2S_TCP : excahnge data
    Dev_TCP->D2S_TCP : excahnge data
    D2S_API->>D2S_TCP: keychange request with new key
    D2S_TCP->Dev_TCP : sent new Key
    Dev_TCP->>Dev : store new key in TPM key store
    Dev_TCP->>D2S_TCP : sent ACK / OK:ERROR
    Dev_TCP->Dev_TCP : use new Key
    D2S_TCP->D2S_TCP : receive ACK / OK
    D2S_TCP->>D2S_DB : store new Key
    D2S_TCP->>D2S_API : respond API request
    D2S_TCP->D2S_TCP : use new key
    Dev_TCP->>D2S_TCP : excahnge data with new Key
    Dev_TCP->>D2S_TCP : excahnge data with new Key