Azure IoT Hub に Node.js で subscribe

Ubuntu 20.10 で確認しました。

azure_subscribe.js

#! /usr/bin/node
// ---------------------------------------------------------------
//  azure_subscribe.js
//
//                  Jan/19/2021
//
// ---------------------------------------------------------------
'use strict'

const { EventHubConsumerClient } = require("@azure/event-hubs");

const eventHubsCompatibleEndpoint = "sb://ihsuprodkwres017dednamespace.servicebus.windows.net/"

const eventHubsCompatiblePath = "iothub-ehub-iot-aa-344012-58f0095d47"

const iotHubSasKey = "QThy0z2eiCOzKcv2Ni5DZCnHL8Gtabcdefghd4pj5D4="

const connectionString = `Endpoint=${eventHubsCompatibleEndpoint};EntityPath=${eventHubsCompatiblePath};SharedAccessKeyName=service;SharedAccessKey=${iotHubSasKey}`;

var printError = function (err) {
  console.log(err.message);
};

var printMessages = function (messages) {
  for (const message of messages) {
    console.log("Telemetry received: ");
    console.log(JSON.stringify(message.body));
    console.log("");
/*
    console.log("Properties (set by device): ");
    console.log(JSON.stringify(message.properties));
    console.log("System properties (set by IoT Hub): ");
    console.log(JSON.stringify(message.systemProperties));
    console.log("");
*/
  }
};

async function main() {
  console.log("IoT Hub Quickstarts - Read device to cloud messages.");

  const clientOptions = {
  };

  const consumerClient = new EventHubConsumerClient("$Default", connectionString, clientOptions);

  consumerClient.subscribe({
    processEvents: printMessages,
    processError: printError,
  });
}

main().catch((error) => {
  console.error("Error running sample:", error);
});

// ---------------------------------------------------------------

必要な値の取得方法

Event Hub-compatible endpoint

az iot hub show --query properties.eventHubEndpoints.events.endpoint --name {
your IoT Hub name}

Event Hub-compatible name

az iot hub show --query properties.eventHubEndpoints.events.path --name {your
 IoT Hub name}

Primary key for the "service" policy to read messages

az iot hub policy show --name service --query primaryKey --hub-name {your IoT
 Hub name}

Portal にアクセスして、connectionString　を読み取ることもできます。
「イベントハブ互換エンドポイント」になります。

実行コマンド

export NODE_PATH=/usr/lib/node_modules
./azure_subscribe.js

参考ページ
Hub からテレメトリを読み取る