我正在使用 Azure IoT 中心的 Node.JS 库发送一些遥测数据,并且间歇性地收到库抛出的以下错误。
Unhandled rejection TypeError: Cannot read property 'on' of undefined at C:\Source\Messenger\app.js:156:17 at Amqp. (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\lib\amqp.js:157:17) at C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\lib\amqp.js:54:19 at C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\lib\amqp.js:84:17 at tryCatcher (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\util.js:11:23) at Promise._settlePromiseFromHandler (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\promise.js:489:31) at Promise._settlePromise (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\promise.js:546:18) at Promise._settlePromise0 (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\promise.js:591:10) at Promise._settlePromises (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\promise.js:670:18) at Async._drainQueue (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\async.js:129:16) at Async._drainQueues (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\async.js:139:10) at Immediate.Async.drainQueues [as _onImmediate] (C:\Source\Messenger\node_modules\azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10\node_modules\bluebird\js\release\async.js:16:14)
目前,我会永远运行我的脚本,以便在生成错误时它会恢复。
还有其他人遇到过这个问题并设法解决它吗?
我的代码如下所示
azureClient = azureDevice.Client.fromConnectionString(connectionString, azureDevice.Amqp);
var message = new azureDevice.Message(JSON.stringify('TEST MESSAGE'));
azureClient.sendEvent(message, function (err) {
if (err != null) {
Configure();
}
});
最佳答案
对于这个问题,我建议您可以使用AMQPWS或HTTP传输来发送和接收消息。 请引用我的步骤实现消息的发送和接收:
首先,我们应该创建一个设备并获取设备 ID 和 SAS。在 Azure 新门户上创建 IOT 中心后,我在 node.js 命令行上运行了这些命令: 在新门户上创建物联网中心。
npm install -g iothub-explorer
iothub-explorer HostName=****.azure-devices.net;SharedAccessKeyName=iothubowner;SharedAccessKey=****/****= create mydevice --connection-string
我得到的结果如下:
Created device mydevice
-
deviceId: mydevice
generationId: 635881160181557968
etag: MA==
connectionState: Disconnected
status: enabled
statusReason: null
connectionStateUpdatedTime: 0001-01-01T00:00:00
statusUpdatedTime: 0001-01-01T00:00:00
lastActivityTime: 0001-01-01T00:00:00
cloudToDeviceMessageCount: 0
authentication:
SymmetricKey:
primaryKey: ****/****=
secondaryKey: ****/****=
-
connectionString: HostName=****.azure-devices.net;DeviceId=mydevice;SharedAccessKey=****/****=
其次,我在node.js项目上安装了SDK,文件夹结构如下图所示:
第三,我在我的项目上运行此代码:
var device = require('azure-iot-device');
var connectionString = 'HostName=****.azure-devices.net;DeviceId=mydevice;SharedAccessKey=****/****=';
var client = device.Client.fromConnectionString(connectionString,device.AmqpWS);
setInterval(function () {
var windSpeed = 10 + (Math.random() * 4); // range: [10, 14]
var data = JSON.stringify({ deviceId: 'mydevice', windSpeed: windSpeed });
var message = new device.Message(data);
message.properties.add('myproperty', 'myvalue');
console.log("Sending message: " + message.getData());
client.sendEvent(message, printResultFor('send'));
}, 1000);
client.getReceiver(function (err, receiver) {
receiver.on('message', function (msg) {
console.log('Id: ' + msg.properties.messageId + ' Body: ' + msg.body);
receiver.complete(msg, function () {
console.log('completed');
// receiver.reject(msg, function() {
// console.log('rejected');
// });
// receiver.abandon(msg, function() {
// console.log('abandoned');
// });
});
receiver.on('errorReceived', function (err) {
console.warn(err);
});
});
});
function printResultFor(op) {
return function printResult(err, res) {
if (err) console.log(op + ' error: ' + err.toString());
if (res) console.log(op + ' status: ' + res);
};
}
效果很好。另外,如果您使用“Http”传输,它也可以正常工作。 您需要使用此代码:
var client = device.Client.fromConnectionString(connectionString);
这就是我建议您使用 AMQPWS 的原因,因为 "azure-iot-device\node_modules\azure-iot-common\node_modules\amqp10-transport-ws"中的代码:
if (this.uri.startsWith('wss')) {
var wsTransport = require('amqp10-transport-ws');
wsTransport.register(amqp10.TransportProvider);
}
如果 URI 的格式为“wss”,它将注册 AMQP 传输。但 AMQP 传输的格式类似于“amqp://”。希望这可以帮助。
关于node.js - 发送消息时 Azure IoT 中心库出错,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34351539/