From the discussion https://forum.plantuml.net/4147, this is an example of a sequence diagram rendered as Unicode AsciiArt, limited to 78 chars, for embedding into an IETF RFC.
puml -tutxt sequence-asciiArt.puml
I can't believe how usable the ascii version is! See png version at https://i.imgur.com/zGFzsrI.png
| @startuml | |
| skinparam maxAsciiMessageLength 8 | |
| title RUE Automatic Configuration | |
| box "RUE Side" #5fddd6 | |
| actor "RUE User" as RUEUSER | |
| participant "RUE" as RUE | |
| end box | |
| box "Domain Name Service" #bb7068 | |
| participant DNS | |
| end box | |
| box "Configuration Service" #5c7068 | |
| participant "HTTPS Server" as CONFIGSERVER | |
| participant "Provider Global Settings" AS PROVIDERSETTINGS | |
| end box | |
| box "Customer Relationship Management" #6fc65f | |
| participant "CRM" | |
| end box | |
| autonumber "<b>[0]" | |
| RUEUSER -> RUE: Select a VRS Provider name | |
| RUE -> DNS: Look up SRV DNS for _rueconfig._tcp.providerdomain.com | |
| DNS -> RUE: SRV DNS response with server.providerdomain.com:443 | |
| RUE -> DNS: If SRV record found, look up DNS for server.providerdomain.com | |
| RUE -->> DNS: If SRV record does not exist, look up DNS for config.providerdomain.com | |
| DNS -> RUE: IP Address of Config Server | |
| RUE -> CONFIGSERVER: TCP connection to 443: TLS: ClientHello (RFC-5246) | |
| CONFIGSERVER -> RUE: TLS: ServerHello | |
| CONFIGSERVER -> RUE: TLS: ServerCertificate | |
| CONFIGSERVER -->> RUE: TLS: ServerKeyExchange if required for premaster secret handshake | |
| CONFIGSERVER -> RUE: TLS: ServerHelloDone | |
| RUE -> CONFIGSERVER: HTTP: GET https://config.providerdomain.com/v1 | |
| CONFIGSERVER -> RUE: HTTP: 401 Unauthorized WWW-Authenticate Digest\nusername="X" realm="Y" qop="auth,auth-int" nonce=... | |
| RUE -> CONFIGSERVER: HTTP: https://config.providerdomain.com/v1 Authorization Digest\nusername="X" realm="Y" qop="auth" nonce=... | |
| CONFIGSERVER -> CRM: Find subscriber information\nfor username="X" | |
| CRM -> CONFIGSERVER: Subscriber specific\nconfiguration information | |
| CONFIGSERVER -> PROVIDERSETTINGS: Retrieve provider specific settings | |
| PROVIDERSETTINGS -> CONFIGSERVER: Provider specific configuration information | |
| CONFIGSERVER -> RUE: 200 OK + JSON key/value hash merge of subscriber specific and\nprovider specific configurations | |
| @enduml |
| RUE Automatic Configuration | |
| ┌─┐ | |
| ║"│ | |
| └┬┘ | |
| ┌┼┐ | |
| │ ┌───┐ ┌───┐ ┌────────────┐ ┌────────────────────────┐ ┌───┐ | |
| ┌┴┐ │RUE│ │DNS│ │HTTPS Server│ │Provider Global Settings│ │CRM│ | |
| RUE User └─┬─┘ └─┬─┘ └─────┬──────┘ └───────────┬────────────┘ └─┬─┘ | |
| [1] Select a VRS Provider name │ │ │ | |
| │ ───────>│ │ │ │ │ | |
| │ │ │ │ │ │ | |
| [2] Look up SRV DNS for _rueconfig._tcp.providerdomain.com │ | |
| │ │──────>│ │ │ │ | |
| │ │ │ │ │ │ | |
| [3] SRV DNS response with server.providerdomain.com:443 │ │ | |
| │ │<──────│ │ │ │ | |
| │ │ │ │ │ │ | |
| [4] If SRV record found, look up DNS for server.providerdomain.com │ | |
| │ │──────>│ │ │ │ | |
| │ │ │ │ │ │ | |
| [5] If SRV record does not exist, look up DNS for config.providerdomain.com | |
| │ │ ─ ─ ─>│ │ │ │ | |
| │ │ │ │ │ │ | |
| [6] IP Address of Config Server │ │ | |
| │ │<──────│ │ │ │ | |
| │ │ │ │ │ │ | |
| [7] TCP connection to 443: TLS: ClientHello (RFC-5246) │ │ | |
| │ │─────────────────>│ │ │ | |
| │ │ │ │ │ │ | |
| │ [8] TLS: ServerHello │ │ | |
| │ │<─────────────────│ │ │ | |
| │ │ │ │ │ │ | |
| │ [9] TLS: ServerCertificate │ │ | |
| │ │<─────────────────│ │ │ | |
| │ │ │ │ │ │ | |
| [10] TLS: ServerKeyExchange if required for premaster secret handshake │ | |
| │ │<─ ─ ─ ─ ─ ─ ─ ─ ─│ │ │ | |
| │ │ │ │ │ │ | |
| │ [11] TLS: ServerHelloDone │ │ | |
| │ │<─────────────────│ │ │ | |
| │ │ │ │ │ │ | |
| [12] HTTP: GET https://config.providerdomain.com/v1 │ │ | |
| │ │─────────────────>│ │ │ | |
| │ │ │ │ │ │ | |
| [13] HTTP: 401 Unauthorized WWW-Authenticate Digest │ │ | |
| username="X" realm="Y" qop="auth,auth-int" nonce=... │ │ | |
| │ │<─────────────────│ │ │ | |
| │ │ │ │ │ │ | |
| [14] HTTP: https://config.providerdomain.com/v1 Authorization Digest │ | |
| username="X" realm="Y" qop="auth" nonce=... │ │ | |
| │ │─────────────────>│ │ │ | |
| │ │ │ │ │ │ | |
| │ │ │ │ [15] Find subscriber information │ | |
| │ │ │ │ for username="X" │ │ | |
| │ │ │ │ ─────────────────────────────────────>│ | |
| │ │ │ │ │ │ | |
| │ │ │ │ [16] Subscriber specific │ | |
| │ │ │ │ configuration information │ | |
| │ │ │ │ <─────────────────────────────────────│ | |
| │ │ │ │ │ │ | |
| │ │ │ [17] Retrieve provider specific settings │ | |
| │ │ │ │ ────────────────────> │ | |
| │ │ │ │ │ │ | |
| │ │ [18] Provider specific configuration information │ | |
| │ │ │ │ <──────────────────── │ | |
| │ │ │ │ │ │ | |
| [19] 200 OK + JSON key/value hash merge of subscriber specific and │ | |
| provider specific configurations │ │ │ | |
| │ │<─────────────────│ │ │ | |
| RUE User ┌─┴─┐ ┌─┴─┐ ┌─────┴──────┐ ┌───────────┴────────────┐ ┌─┴─┐ | |
| ┌─┐ │RUE│ │DNS│ │HTTPS Server│ │Provider Global Settings│ │CRM│ | |
| ║"│ └───┘ └───┘ └────────────┘ └────────────────────────┘ └───┘ | |
| └┬┘ | |
| ┌┼┐ | |
| │ | |
| ┌┴┐ |
