# emqx-rule-engine

IoT Rule Engine for EMQ X Broker.

## Concept

```
iot rule "Rule Name"
  when
     match TopicFilters and Conditions
  select
    para1 = val1
    para2 = val2
  then
    take action(#{para2 => val1, #para2 => val2})
```

## Architecture

```
          |-----------------|
 Pub ---->| Message Routing |----> Sub
          |-----------------|
               |     /|\
              \|/     |
          |-----------------|
          |   Rule Engine   |
          |-----------------|
               |      |
        Backends Services Bridges
```

## SQL for Rule query statement

```
select id, time, temperature as t from "topic/a" where t > 50;
```