@startuml
title 客户端请求状态机
note as N1
enum {
    kNoError=0,
    kErrBadRequest,
    kErrP2Timeout,
} ClientErr;

static inline bool isRequestComplete() {return state==Idle;}

while (Idle != client->state) {
    receiveCAN(client);
    Iso14229ClientPoll(client);
}
end note

state Idle
state Sending
state Sent
state SentAwaitResponse
state ProcessResponse
Idle: if (ISOTP_RET_OK == isotp_receive(...)) // Error
ProcessResponse: isotp_receive()
ProcessResponse: _ClientValidateResponse(...)
ProcessResponse: _ClientHandleResponse(...)

Sending --> Sent: 传输层完成传输 

Sent --> Idle : suppressPositiveResponse
Sending --> SentAwaitResponse: !suppressPositiveResponse
SentAwaitResponse -> Idle: 响应收到了 ||\np2 超时
SentAwaitResponse --> ProcessResponse : ISOTP_RECEIVE_STATUS_FULL == link->receive_status
ProcessResponse --> Idle

[*] -> Idle
Idle -> Sending : _SendRequest()

@enduml

@startuml
title Request Lifecycle
alt normal
    alt positive response
        client --> client: Sending
        client -> server : *Any* Service
        client --> client: SentAwaitResponse: set p2
        alt 0x78 requestCorrectlyReceived-ResponsePending
            server -> client : 0x3F 0x78 
            client -->server : txLink  idle
            client --> client: SentAwaitResponse: set p2star
        end
        server -> client : Positive Service Response
        client --> client: Idle 
    else negative response
        server -> client !! : Negative Service Response
        client --> client: Idle: RequestErrorNegativeResponse
    else SID mismatch
        server -> client !! : Mismatched Service Response
        client --> client: Idle: RequestErrorResponseSIDMismatch
    end
else unexpected response
    server -> client !! : Unexpected Response
    client --> client: Idle: RequestErrorUnsolicitedResponse
end
@enduml

@startuml
' !pragma useVerticalIf on
title 客户端请求流程
start

:clientSendRequest();
if (验证参数) then (对)
:ok;
else (不对)
:foo;
detach
endif

:clearRequestContext();
if (等待UDS访问) then (访问接收了,进入UDS会话)
else (时间超过<b>20ms)
@enduml

@startuml
client -> server : *Any* Service
server -> userServiceHandler: handler(args)
note right: Doing this will take a long time\nso I return 0x78
userServiceHandler -> server: 0x78
server -> client : 0x3F 0x78 
client -->server : txLink  idle
server -> userServiceHandler: handler(args)
note right: actually call the long-running service
... p2* > t > p2 ... 
userServiceHandler -> server : Service Response
server -> client : Service Response
@enduml

@startuml
' !pragma useVerticalIf on
title 0x78流程(写flash)
start

:BufferedWriterWrite(BufferedWriter *self, const uint8_t *ibuf, uint32_t size, bool RCRRP);

if (RCRRP) then (true)
:write to flash;
else (false)
endif
if (iBufIdx == size) then (true)
    :write to pageBuffer;
    :iBufIdx = 0;
    :return kBufferedWriterWritePending;
    :0x78 RCRRP;
    detach;
else (false)
    :memmove(pageBuffer + pageBufIdx, iBuf + iBufIdx, size - iBufIdx);
    :write to pageBuffer;
    :iBufIdx += size;
    :0x01 PositiveResponse;
    :0x78 RCRRP;
    detach
endif

@enduml