@nrfcloud/gateway-common

@nrfcloud/gateway-common

Common module for JavaScript based gateways.

Introduction

This module contains the gateway logic for communicating with the nRF Cloud platform and Bluetooth devices.

Install

npm i @nrfcloud/gateway-common

Setup

You'll need to provide a class that inherits from bluetoothAdapter. This will have to be specific for your system. See ExampleAdapter for an example.

Create a gateway on your nRF Cloud account (make sure you have an account first!) using the following command:

npx @nrfcloud/gateway-registration

It will ask you for your login credentials. It will output three files in a ./result directory. For MQTTS, you'll need the certificates and gateway ID. For WSS, you'll just need the gateway ID. WSS uses Cognito authentication to provide security.

Use

In your code, create a new Gateway and pass in a configuration object.

It is suggested that you use environment variables and something like dotenv.

(Note that this example is in Typescript, but plain JS works as well.)

import { Gateway, GatewayConfiguration, GatewayEvent } from 'gateway-common';
import { NobleAdapter } from './src/adapters/nobleAdapter';
const configuration: GatewayConfiguration = {
    keyPath: process.env.PRIVATE_KEY_PATH,
    certPath: process.env.CLIENT_CERT_PATH,
    caPath: process.env.CA_CERT_PATH,
    gatewayId: process.env.GATEWAY_ID,
    host: process.env.HOST,
    stage: process.env.ENVIRONMENT_STAGE,
    tenantId: process.env.TENANT_ID,
    bluetoothAdapter: new NobleAdapter(),
};
const gateway = new Gateway(configuration);

Upon instantiation, the gateway will try to connect to nRF Cloud.

Events

The gateway will emit some events as things happen.

• GATEWAY_DELETED: The gateway has been deleted from nRF Cloud. You'll probably want to delete the certs since they're not useful any more
• NAME_CHANGED: Gateway name has been changed
• DEVICE_REMOVED: Device has been removed from the gateway
• CONNECTIONS_CHANGED: The device connections have changed

Example

To see an implementation of this project, see the Raspbery Pi gateway.