mqtt - rest bridge using the smart object api
TRANSCRIPT
MQTT -‐ REST Bridge using the Smart Object API
Open Source Internet of Things
SmartObject API Web Object EncapsulaBon
Smart Object
Web protocol interfaces, also M2M e.g. MQTT
Event Model Links data with acBons Pub-‐Sub and event handlers
Encapsulates local soJware components and handlers
Self-‐describing data model For Resource Discovery
and Linkage
Sensor or other data JSON, XML, data feeds
SmartObject API – Observers • Contains graphs which define endpoints of event driven processing and communicaBon
• The Observer paTern is the basis for M2M communicaBon abstracBons
• Publisher, Subscriber, Event Handler classes • Reference ImplementaBon – create (POST) makes a new Observer
• Publisher, Subscriber, or Handler Class – set (PUT) updates an Observer’s seZngs – get (GET) returns an Observer’s seZngs – delete (DELETE) removes an Observer
MQTT Observer • Implements the MQTT M2M AbstracBon Layer • Publish, Subscribe, or Pub+Sub using the mqTObserver resource class
• Prototype opens a connecBon to a specified broker for each REST endpoint
Observers.create({'resourceName': 'mqttTestObserver',\!
! ! ! ! ! 'resourceClass': 'mqttObserver',\! 'connection': 'smartobjectservice.com',\! 'pubTopic': ’sealevel_pressure',\! 'subTopic': None,\! 'QoS': 0,\! 'keepAlive': 60 })!
MQTT Observer
MQTT Broker
REST Endpoint ObservableProperty
mqTObserver
PUT GET
Publish from data producer
Publish From REST API
Publish to Other Subscribers
SUB Publish to REST API
Connects REST Resource to MQTT Topic Publish and Subscribe
MQTT Observer
MQTT Broker
REST Endpoint ObservableProperty
mqTObserver
PUT GET
Publish from data producer
Publish From REST API
Publish to Other Subscribers
SUB Publish to REST API
Publisher Publishes REST Resource updates to the broker
MQTT Observer
MQTT Broker
REST Endpoint ObservableProperty
mqTObserver
PUT GET
Publish from data producer
Publish From REST API
Publish to Other Subscribers
SUB Publish to REST API
Subscriber Makes last published data available at the REST endpoint
MQTT Observer
MQTT Broker
REST Endpoint ObservableProperty
mqTObserver
PUT GET
Publish from data producer
Publish From REST API
Publish to Other Subscribers
SUB Publish to REST API
Pub+Sub Repeats data updates in both direcBons
MQTT Bridge to mulBple REST endpoints
MQTT Broker
REST Endpoint ObservableProperty
mqTObserver
PUT GET
Publish from data producer
Publish to Other Subscribers
REST Endpoint ObservableProperty
mqTObserver
PUT GET
IoT Toolkit
• IoT Toolkit is a reference implementaBon of the Smart Object API and related tools
• REST API with real-‐Bme event model for the Internet of Things
• Lightweight server that can run on small computers e.g. Raspberry Pi
• Work in progress prototype (limited excepBon handling and simple interfaces)
IoT 2.0 – Interoperability
M2M CoAP M2M
MQ SOA
M2M HTTP
Smart Object API IoT Toolkit
Discovery
ApplicaBons
Thing Models
Resource Models
• Object Model • REST + Event Model • M2M Abstrac<ons
IoT Toolkit
Connected Things, Sensors, Actuators, Data Sources
Seman?c Repository
• Easy to deploy new things and applicaBons using data models
• Write once run anywhere, any app to any thing via any M2M
• Network effect enabled
• Allows for appropriate M2M choice
Interoperability Architecture
SO
SO
SO
Gateway Server Cloud Endpoints
• Sensors • Devices
ApplicaBon Components
And Resources
Databases
Instances
Classes SRT
• Discovery • Persistence • ReplicaBon • Resource Access
• Data Models • Sensor Models • Machine Models • Templates