docs(index): record OtOpcUa's MQTT / Sparkplug B driver
The OtOpcUa entry's driver set changed, so the index has to change with it
(OtOpcUa CLAUDE.md's cross-repo rule).
A read-only `Mqtt` broker-subscribe driver landed with two ingest shapes over
one MQTTnet-5 client: Plain binds a tag to a concrete topic, SparkplugB decodes
vendored Eclipse-Tahu protobuf under a single spBv1.0/{groupId}/# subscription
and binds by the group/edgeNode/device?/metric tuple (birth/alias/seq-gap/
rebirth state machine, death→STALE, a birth-driven browse picker with a scoped
Request-rebirth NCMD). Write-through is deferred — every MQTT node is read-only.
Live-gated on docker-dev against a Mosquitto TLS+auth broker plus a
project-owned C# Sparkplug edge-node simulator on 10.100.0.35:8883.
Recorded as **on branch feat/mqtt-sparkplug-driver, not yet merged to master**,
so the index does not overstate what is on OtOpcUa's default branch — unlike the
Sql DB-poll driver next to it, which is merged.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
This commit is contained in:
Joseph Doherty