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CephalonEngine

Cephalon.Observability.MqttDependencies

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Maturity: M0 · Ownership: taxonomy-only · Family: observability · See audit, matrix.

Cephalon.Observability.MqttDependencies is the reusable dependency-health companion package for MQTT brokers and edge messaging endpoints.

What it owns

Section titled “What it owns”
  • Engine:Observability:DependencyHealth:Mqtt option binding
  • reusable MQTT 3.1.1 CONNECT plus PINGREQ/PINGRESP probe flow
  • explicit username/password and TLS wiring for broker reachability checks
  • diagnostics conventions and runtime dependency-health contributions for MQTT endpoints

Main surfaces

Section titled “Main surfaces”
  • Configuration/MqttDependencyDefinition.cs
  • Configuration/MqttDependencyHealthOptions.cs
  • Hosting/MqttDependencyHealthServiceCollectionExtensions.cs

Source structure

Section titled “Source structure”
  • Configuration
  • Hosting
  • Services

How it fits

Section titled “How it fits”

This package stays outside Cephalon.Engine and turns configured MQTT endpoints into IDependencyHealthContributor data. Hosts keep the shared runtime health and readiness semantics from the engine, while this companion handles the provider-specific wire exchange: open the TCP or TLS connection, send CONNECT, validate the broker CONNACK, and verify a PINGREQ -> PINGRESP round-trip. Pair it with Cephalon.Eventing or Cephalon.Edge when a host wants broker-aware operational checks without pushing MQTT socket details into the engine core.

Section titled “Related docs”