Task 9. Adds MqttDriverFactoryExtensions (DriverTypeName = DriverTypeNames.Mqtt,
direct deserialization of MqttDriverOptions — no intermediate DTO, mirroring
OpcUaClientDriverFactoryExtensions), the DriverTypeNames.Mqtt constant, and both
host wiring sites: the factory in DriverFactoryBootstrap.Register and the probe in
AddOtOpcUaDriverProbes (the admin-node path Program.cs calls in its hasAdmin
block — a probe wired only on driver nodes makes Test-connect silently dead).
Carried-forward items:
- Converges every MQTT config-parsing seam onto ONE JsonSerializerOptions —
MqttJson.Options, in .Contracts alongside MqttDriverOptions. It replaces the
probe's internal JsonOpts and the browser's separate private copy; the factory,
the probe, MqttDriver.ParseOptions and MqttDriverBrowser now all parse through
it. .Contracts is the only assembly all four consumers reference, and the
browser's reference to the runtime .Driver project is a documented layering
exception scheduled for removal — anchoring the options there would resurrect
the duplicate the day it goes away.
- Replaces the "Mqtt" literals in MqttDriverProbe, MqttDriverBrowser and
MqttDriver with the constant (string value unchanged).
- Tightens MqttDriverProbeTests.ProbeAsync_EnumAsName: it asserted only
Ok == false + non-empty message, which is also exactly what a JSON-parse
failure produces — so it stayed green under the very regression it names.
It now asserts the probe got past the parse and reached the network.
Falsifiability: deleting JsonStringEnumConverter from MqttJson.Options reddens 9
tests across 4 suites, including the tightened probe test (message becomes
"Config JSON is invalid: The JSON value could not be converted to
MqttProtocolVersion") — which the pre-fix assertions would have passed.
Also references the MQTT driver from Core.Abstractions.Tests so
DriverTypeNamesGuardTests' reflective bin scan discovers the new factory and the
constant/factory parity check stays honest.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Joseph Doherty