Javascript real-time SDK

iotflows-js npm package https://www.npmjs.com/package/@iotflows/iotflows-js

IoTFlows Open Source JavaScript WebSocket SDK.

iotflows-js npm package https://www.npmjs.com/package/@iotflows/iotflows-js

With this tool you can:

1. Publish secure real-time data streams.

2. Subscribe to the data streams and access real-time data on your web/mobile/IoT apps.

3. Publish alerts to the alert channels with a defined severity level. Subscribers will get notified in the form of SMS/Email/Push.

4. Define cloud actions that can be called from other IoT devices/web applications.

Installation

Use npm to install the iotflows.js module:

npm install @iotflows/iotflows-js

Usage

loadIoTFlows

This function will create and initialize an IoTFlows instance. This is an async function and you would need to use 'await' to ensure proper initialization.

const {loadIoTFlows} = require('@iotflows/iotflows-js')
var iotflows = await loadIoTFlows('API_KEY_USERNAME', 'API_KEY_PASSWORD');

Make sure to change API_KEY_USERNAME and API_KEY_PASSWORD with the proper credentials obtained from IoTFlows console. These credentials can be either one of these options:

1. A Device API Key that has permission to interact with the resources available in its project, or

2. An Organization IoT API Key that can have read-only or read/write permissions to the entire organization resources

3. A User Client that is authorized to interact with the permitted resources of the user. This option is most useful when you need to build a web or mobile app. For this option, you need to register your Application in IoTFlows and authenticate users using OAuth2. With the obtained JWT, you can perform a Basic authentication HTTP request to generate a User Client.

Publish data stream

To publish a real-time data stream, you need to pass these parameters in a json object:

• data_stream_uuid: the uuid of the data stream

• data: the data to be published to the data stream

Read more:

• How to create a data stream

Example:

await iotflows.publish({
    data_stream_uuid: 'ds_xxxxxxxxxxxxxxxxxxxxxxx',
    data: '81'
})  

Subscribe to data stream

To listen to real-time data streams that are published, you need to define the following parameters in a json object:

• data_stream_uuid: data stream uuid

• qos (optional): quality of service 0, 1, or 2 (0: At most once, 1: At least once, 2: Exactly once)

• callback: handler function to be called when data received

Example:

await iotflows.subscribe({
    data_stream_uuid: 'ds_xxxxxxxxxxxxxxxxxxxxxxx',        
    callback: function handler(topic, payload){
        console.log("New message received!")        
        console.log(payload)        
    }
})

Publish an alert

To publish an alert, you need to pass these parameters in a json object:

• alert_channel_uuid: the uuid of the alert channel

• severity: the severity of the alert. It can be MAJOR, MINOR or INFORMATIVE

• subject: the subject of the alert

• description: the description/message of the alert

Read more:

• How to create an alert channel

Example:

await iotflows.alert({
    alert_channel_uuid: 'ac_xxxxxxxxxxxxxxxxxxxxxxxx',
    severity: 'MINOR',
    subject: 'Water Leak',
    description: 'Water leackage detected in Site A.'
})  

Define a cloud action

To define a cloud action that can be called from other IoT/web applications, you need to define the following parameters in a json object:

• action_uuid action uuid

• qos (optional): quality of service 0, 1, or 2 (0: At most once, 1: At least once, 2: Exactly once)

• callback: handler function to be called when action gets executed

Read more:

• How to create an action

Example:

await iotflows.defineAction({
    action_uuid: 'da_xxxxxxxxxxxxxxxxxxxxxxxxx',
    callback: function handler(topic, payload){
        console.log("New command received!")        
        console.log(payload)                
    }
})

Call/Execute a cloud action

To publish an alert, you need to pass these parameters in a json object:

• action_uuid: the uuid of the action

• payload: the payload to be published to the action

Example:

await iotflows.callAction({
    action_uuid: 'da_xxxxxxxxxxxxxxxxxxxxxxxxx',
    payload: false
})   

Publish a generic MQTT message

To publish an MQTT message with a defined topic, you need to pass these parameters:

• topic: the mqtt topic

• payload: the message payload to be sent

Example:

await iotflows.publishMQTT(
    'v1/organizations/92c2ddd58730dc9b4e9bb620e7ebcaf5/projects/e9531cc1d542999c0bf081c4147c206a/devices/8d786feef417aeb398f8076fecbe0242/data-streams/7ea022531d23b8d4a6622e3725b5fba2',
    'Hello!'
) 

Subscribe to a generic MQTT topic

To subscribe to a generic MQTT topic, you need to define the following parameters:

• topic: the mqtt topic

• callback: the callback handler function that gets triggered once a message is received

Example:

iotflows.subscribeMQTT(
    'v1/organizations/92c2ddd58730dc9b4e9bb620e7ebcaf5/#',
    function handler(topic, payload){
        console.log("New message received!")        
        console.log(topic)
        console.log(payload)
    }
)