doc/ymodem.svg

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@startuml ymodem

skinparam backgroundColor #FEFEFE
scale 1.6

participant SENDER
participant RECEIVER

loop every file
    RECEIVER -> SENDER: C
    SENDER -> RECEIVER: block 0 (filename + dim (opt))
    SENDER <- RECEIVER: ACK
    SENDER <- RECEIVER: C
    loop N blocks
        SENDER -> RECEIVER: block n
        SENDER <- RECEIVER: ACK
    end
    SENDER -> RECEIVER: EOT
    SENDER <- RECEIVER: ACK
end
RECEIVER -> SENDER: C
SENDER -> RECEIVER: block 0 (empty)
SENDER <- RECEIVER: ACK

@enduml

PlantUML version 1.2020.02(Sun Mar 01 11:22:07 CET 2020)
(GPL source distribution)
Java Runtime: OpenJDK Runtime Environment
JVM: OpenJDK 64-Bit Server VM
Java Version: 21.0.3+9-Ubuntu-1ubuntu1
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>