OpenPrinterOpenPrinter Agent Gateway
Server sends hello
The server correlates this response to agent.hello, identifies the
service and session, and advertises the heartbeat and wire-size limits
the agent must observe for the rest of the connection.
Address
/.well-known/openprinter/gatewayDescription
The authenticated, bidirectional OPPA gateway socket.
Messages
The server's correlated response to agent.hello. It selects the
protocol version and communicates service limits for this session.
Payload
Message Example
{ "protocolVersion": "1", "messageId": "message_hello_response_01", "sentAt": "2026-08-21T00:00:01Z", "correlationId": "message_hello_01", "type": "server.hello", "payload": { "serverId": "neplex-openprinter-cloud", "serverVersion": "0.1.0", "brand": { "name": "Neplex OpenPrinter Cloud" }, "sessionId": "session_01", "supportedProtocolVersions": [ "1" ], "selectedProtocolVersion": "1", "heartbeatIntervalMs": 30000, "maxMessageBytes": 2097152 }}