Changelog

What changed in each release. The release workflow publishes a version's
section here as its release notes, and refuses a tag without one - so a
change worth knowing about is written here when it is made, under
Unreleased, and the heading becomes the version when it ships.

The format follows Keep a Changelog;
versions follow Semantic Versioning. Until 1.0.0 a
minor version may change the API or the configuration, and says how here.

Unreleased

0.1.0

The first release: the library for boards and hosts, and modbee-mqtt, the server
built from it, as downloads for Linux and Windows and as a Docker image.

The library

• MQTT 5.0 and 3.1.1 in C++14, with nothing that waits on the network: a
  client, a broker and a bridge, the same source on a board and a host.
• MqttDevice, typed values, Sparkplug B (an edge node and a host
  application, tested with the Eclipse Sparkplug TCK).
• Boards: ESP32, ESP8266, mbed (Portenta, Opta, Nano 33), RP2040, STM32 - over
  Wi-Fi, Ethernet or cellular, with TLS on each.

The server

• modbee-mqtt serve: one broker per CPU core behind one port, configured with
  one modbee.yaml; sessions and retained messages that survive a restart;
  device logins and provisioning.
• The Kafka pipe: MQTT to Kafka and back, messages passed through untouched,
  a PUBACK only once Kafka has the message.
• The Application API, gRPC with a REST admin surface: consumer groups that
  share a device's messages, publishing to devices, connections, sessions,
  retained messages and logins - on a Unix socket, or TCP with a token.
• Linux (x86-64, ARM64) and Windows (x86-64), as a service on both.

Ready to run

• .deb and .rpm packages, x86-64 and ARM64.
• Set up with the modbee-mqtt command alone, the same on Linux and Windows:
  modbee-mqtt service install runs it as a service (systemd, or a Windows
  service) keeping everything in one folder, and modbee-mqtt admin sets the
  admin login. No configuration file.
• modbee-mqtt for Linux as one static binary that runs on any distribution, and
  modbee-mqtt.exe for Windows as one file - each with the broker, the Kafka pipe,
  the Application API and the CLI inside; modbee-mqtt --version lists them.
• Each attested by GitHub, with a CycloneDX SBOM, and a checksum list signed
  with Sigstore. docs/releases.md
  shows how to check one.
• The Docker image: ghcr.io/mod-bee/modbee-mqtt:0.1.0, amd64 and arm64.