OpenPrinterOpenPrinter Agent Gateway
Agent sends heartbeat
Reply to each server.heartbeat by copying its messageId into
correlationId. The uptime value is informational; the correlation is
what proves that this connection is responsive.
Address
/.well-known/openprinter/gatewayDescription
The authenticated, bidirectional OPPA gateway socket.
Messages
A correlated liveness response. The correlationId points to the
server.heartbeat message being answered.
Payload
Message Example
{ "protocolVersion": "1", "messageId": "heartbeat_response_01", "sentAt": "2026-08-21T00:00:31Z", "correlationId": "heartbeat_01", "type": "agent.heartbeat", "payload": { "uptimeSeconds": 31 }}