Pipeline Workflow
Pipeline Workflow
Design
sequenceDiagram
participant App
participant Client as Ecr17Client
participant Session as Ecr17Session
participant Codec as PacketCodec
participant POS
App->>Client: command method
Client->>Client: ensureConnected()
Client->>Session: exchange(payload)
Session->>Codec: encodeApplication(payload)
Codec-->>Session: STX payload ETX LRC
Session->>POS: send frame
POS-->>Session: ACK
POS-->>Session: SOH progress
POS-->>Session: STX response ETX LRC
Session->>POS: ACK
Session-->>Client: DecodedPacket
Client-->>App: typed response
Workflow notes
- Build the application payload with
Ecr17Protocol. - Encode it as a physical frame with
PacketCodec. - Complete the ACK/NAK handshake.
- Stream progress and receipt callbacks.
- Validate the final application frame LRC.
- Parse the payload into a typed response object.
Gotcha
An application result may arrive before a physical ACK. The session stores that pending result and returns it through the normal result path instead of dropping it.
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