MQTT Technical Committee at OASIS Analysis of Current
MQTT Technical Committee at OASIS Analysis of Current Charter Summary of Current Charter Cant change this Might need minor edits Revision required Revision required Cant change this Might need minor edits Dont need to change this Statement of Purpose Four Sections Introduction Background and Opportunity
Needs and Requirements Value of Standardization Nothing in these sections constrains what we do, and nothing seems wildly out of date Members might want to make some some minor updates The next three slides paraphrase the contents of these sections Primary Need and Applicability A simple, predictable, and easy to implement message protocol for connecting embedded and mobile devices such as physical sensors, controllers, and smart phones with servers used in Web, enterprise, and other applications Support implementations on devices with limited power, processor or memory resources Connect to a range of web services and enterprise middleware in network constrained environments where networks may
present combinations of low bandwidth intermittent connectivity unpredictable reliability high data cost. Key Requirements An open publish/subscribe protocol for telemetry messaging Bi-directional messaging to uniformly handle both signals and commands. Determinable delivery of messages over intermittent, limited bandwidth
networks Basic Quality of Service (QoS) levels to reflect tradeoffs between bandwidth, availability, and delivery guarantees. Always-connected and sometimes-connected Subscriber must be able to set up a quality of service appropriate to constraints and characteristics of the message source's network connection. Connectivity Awareness. Provide the ability to determine the likely connected, disconnected or error state of the end devices in the network Loose coupling. Time, space and synchronization decoupling are needed.
Must be implementable in a proliferation of platforms, technologies and networks that are driven by very diverse equations of cost, technology and physical constraints. Scalability suitable to supporting environments where large numbers of devices need to be connected to a server infrastructure. Value of Standardization A standardised protocol means: Choices. Initial choices in devices, networks and suppliers will not limit choices and adaptability in the future. Flexible Integration. With devices and device controllers utilizing a standardized message protocol, a basic publish-subscribe model can support integration with a wide range of established messaging and event processing systems, allowing subscribers to effectively decouple from device and network
APIs. Shorter Time to Market. Reduce the need to support multiple protocols on multiple similar platforms Provides an open protocol that scales well from critical embedded systems up to high volume enterprise transaction processing, Data, platform and language independence will accelerate integration. Skills. Provide standard based on a protocol and programming model familiar to both embedded and IT programming communities Scope of Work - Input The TC will accept, as its input document, Version 3.1 of the MQTT specification as published by Eurotech and IBM, and publically available under royalty free terms at http://mqtt.org/documentation. This needs to be changed to reference MQTT 3.1.1 instead The TC will also accept as input a list of issues and recommended changes from the TC Members.
OK Changes to the input document or other contributions will be accepted for consideration without any prejudice or restrictions and evaluated based on technical merit in so far as they conform to this charter. Ok The scope of the TC's first set of deliverables includes further refinement of the input document, addressing specification issues raised by authoring companies, incorporating appropriate additional contributions to the TC, and addressing issues raised in the TC itself. This needs to be changed. We could probably delete it entirely Scope of Work
We need to consider how to change the following.. A goal of the TC is to minimize disruption to existing implementations, making it straightforward to support both the Version 3.1 of the MQTT specification and the OASIS standard. Requirements and recommendations which would break backward compatibility or be otherwise out of scope, will be documented for a future major revision or re-charter of the TC Other statements about compatibility Changes to the input document, other than editorial changes and other points of clarification, will be limited to the Connect command, and should be backward compatible with implementations of previous versions of the specification: A client coded to speak an older version of the protocol will be able to connect to, and successfully use, a server that implements a newer version of the protocol.
Mobile and other field equipment is often expensive or otherwise impractical to upgrade immediately in response to server and other IT version changes. In Scope The standard version of the MQTT 3.1 specification shall cover the following concepts and capabilities: Use of a publish-subscribe message pattern to provide one-to-many message distribution and decoupling of applications A messaging transport agnostic to the content of the payload Use of TCP/IP to provide basic network connectivity QoS specifications for message delivery: At Most Once: where messages are delivered according to the best efforts of the underlying TCP/IP network. Message loss can occur here. At Least Once: where messages are assured to arrive but duplicates may occur. Exactly Once: where message are assured to arrive exactly once. Maintaining a very low transport overhead, and minimizing protocol
exchanges in order to reduce network traffic. A mechanism to notify interested parties to an abnormal disconnection of a client using a keep-alive message and a last-willand-testament mechanism. Non-Normative, In Scope The TC may produce the following: Requirements and recommendations document for enhancements which break backward compatibility or are otherwise deemed out of scope. Collected for consideration in a future major revision or re-charter of the TC. Requirements and recommendations document for enhancements or issues deemed within in scope but which cannot otherwise be contained in the first version of the standard. Collected for consideration in a future major or minor revision of the standardized specification. Primer or white paper describing usage examples, scenarios and/or best practices, including examples of integration with message servers. Primer or white paper describing examples and usage of MQTT topics with commonly available registry and discovery mechanisms. Test scenario descriptions.
Out of Scope Non-exhaustive list of out-of-scope items. If some function, mechanism or feature is not mentioned here as Out of Scope, and it is not listed as In Scope in the Scope of Work section, then it will also be considered as Out of Scope. Mappings of MQTT functions to any programming language or particular messaging middleware. Reference implementations of the protocol Payload format of messages published according to the specifications (except for the values and fields directly related to the MQTT protocol) Standardized MQTT topic names Any MQTT-specific mechanism or convention to classify topics or topic spaces. No security features will be added over and above the input specification.
Maintenance Once the TC has completed work on the deliverable and it has become an OASIS Standard, the TC will enter "maintenance mode" for the deliverable. The purpose of maintenance mode is to provide minor revisions to previously adopted deliverables to clarify ambiguities, inconsistencies and obvious errors. The maintenance mode will not functionally enhance a previously adopted deliverable or extend its functionality. The TC will collect issues raised against the deliverables and periodically process those issues. Issues that request or require new or enhanced functionality shall be marked as enhancement requests and set aside. Issues that result in the clarification or non-substantive correction of the deliverables shall be processed. The TC shall maintain a list of these adopted clarifications and may periodically create a new minor revision of the deliverables including these updates. Deliverables
The TC shall produce the OASIS standard version of the MQTT protocol specification which will be targeted for completion within 12 months of the TC's first meeting. Follow-on versions of the standard to address additional in scope capabilities may be developed by the TC on a schedule to be defined by the TC Anticipated Audience Developers of products and solutions in constrained environments for which the MQTT specification is designed, such as devices, edge-of-network servers/controllers, monitoring servers, embedded and control systems, embedded platforms, mobile and web applications, middleware and enterprise applications as well as network providers.
System integrators at multiple levels will apply this specification, including integration with products and solutions from various wireless network providers and middleware suppliers. Cellular providers and other communications companies participating in M2M based service offerings will apply this specification for service level offerings.
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