EsperIoT 
EsperIoT is an MQTT connector and configuration manager for Esper CEP Engine. With EsperIoT, your application can specify any statements and subscribe upcoming results from the engine.
For example, a thermo sensor publishes measurements to a MQTT Broker. EsperIoT allows you to create a new statement over REST Api such as selecting average value when it reaches a specific threshold for last 24 hours. When measurement values reaches that condition, a new message will be published for regarding statement Mqtt topic.
What is Esper?
Esper is a CEP which allows you to process data in memory by arrival. Esper has its own SQL like Domain Specific Language to process data, called EPL In EPL:
- SQL → EPL
- Tables → Event Streams, Views
- Rows → Events
How to run
You need a MQTT server running and the easiest way to start one is Docker.
docker run --rm -it -p 1883:1883 eclipse-mosquitto
Now you can run EsperIoT:
./mvnw spring-boot:run -Drun.arguments=--mqtt.serverURI=tcp://127.0.0.1:1883
Go to the Swagger UI to explore the REST API.
Features
- Spring Rest endpoints to
- add/remove/list Esper statements
- swagger-ui under
/swagger-ui.html
- MQTT broker publish/subscribe service
TODO
- Implementing some IoT object types as event to receive like:
- Adding new Examples and documentation
- New endpoints for changing engine configuration
- Integration Test
- use better mapper for DTO such as mapstruct
- Integration test
License
EsperIoT is an extended work of Esper by EsperTech Inc., so it is released under GNU Public License v2.0. Any new project based on this source code should also follow this license.