[英]AWS IoT MQTT only works on the example topic?
我刚刚开始使用 AWS 和 IoT。 使用文档和教程,我设法从示例类中获取了一个工作发布应用程序:
public static void main(String[] args) throws AWSIotException, InterruptedException {
String clientEndpoint = "<prefix>-ats.iot.us-west-2.amazonaws.com"; // replace <prefix> and <region> with your own
String clientId = "sdk-java-23"; // replace with your own client ID. Use unique client IDs for concurrent connections.
String certificateFile = "athing.cert.pem"; // X.509 based certificate file
String privateKeyFile = "athing.private.key"; // PKCS#1 or PKCS#8 PEM encoded private key file
// SampleUtil.java and its dependency PrivateKeyReader.java can be copied from the sample source code.
// Alternatively, you could load key store directly from a file - see the example included in this README.
SampleUtil.KeyStorePasswordPair pair = SampleUtil.getKeyStorePasswordPair(certificateFile, privateKeyFile);
AWSIotMqttClient client = new AWSIotMqttClient(clientEndpoint, clientId, pair.keyStore, pair.keyPassword);
// optional parameters can be set before connect()
client.connect();
String topic = "sdk/test/java";
String payload = "[\n" +
"{\n" +
" \"id\": \"1231231234123\",\n" +
" \"value\": \"25\",\n" +
" \"unit\": \"°C\",\n" +
" \"timestamp\": \"1585954728\"\n" +
"},\n" +
"{\n" +
" \"id\": \"121231231233\",\n" +
" \"value\": \"26\",\n" +
" \"unit\": \"°B\",\n" +
" \"timestamp\": \"1585254728\"\n" +
"}"+
"]";
System.out.println(payload);
while (true) {
client.publish(topic, AWSIotQos.QOS0, payload);
System.out.println("message sent");
Thread.sleep(2000);
}
}
我可以在 aws 控制台上看到成功通过的消息:
但是,如果我将发布主题更改为:
String topic = "sdk/test/java";
至:
String topic = "sensors/temperature";
现在它不再起作用了。 我没有看到 AWS 控制台中出现任何内容,并且 java 程序显示某种连接错误。 我的第一直觉是某种安全问题,不允许发布到示例程序中使用的主题以外的任何主题。 我没有 IAM、cognito 等方面的经验,所以我需要一些指导(如果这是原因的话)
Apr 04, 2020 4:29:05 PM com.amazonaws.services.iot.client.core.AwsIotConnection onConnectionSuccess
INFO: Connection successfully established
Apr 04, 2020 4:29:05 PM com.amazonaws.services.iot.client.core.AbstractAwsIotClient onConnectionSuccess
INFO: Client connection active: sdk-java
Apr 04, 2020 4:29:05 PM com.amazonaws.services.iot.client.core.AwsIotConnection onConnectionFailure
INFO: Connection temporarily lost
Apr 04, 2020 4:29:05 PM com.amazonaws.services.iot.client.core.AbstractAwsIotClient onConnectionFailure
INFO: Client connection lost: sdk-java
Apr 04, 2020 4:29:08 PM com.amazonaws.services.iot.client.core.AwsIotConnection$1 run
INFO: Connection is being retried
Apr 04, 2020 4:29:11 PM com.amazonaws.services.iot.client.core.AwsIotConnection onConnectionSuccess
INFO: Connection successfully established
Apr 04, 2020 4:29:11 PM com.amazonaws.services.iot.client.core.AbstractAwsIotClient onConnectionSuccess
INFO: Client connection active: sdk-java
所以事实证明这只是一个政策问题,我不知道您必须定义哪些 ClientID 以及允许发布/订阅哪些主题等。
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"iot:Publish",
"iot:Receive"
],
"Resource": [
"arn:aws:iot:us-west-2:<>:topic/sensors/realtime",
"arn:aws:iot:us-west-2:<>:topic/sdk/test/java",
"arn:aws:iot:us-west-2:<>:topic/sdk/test/Python",
"arn:aws:iot:us-west-2:<>:topic/topic_1",
"arn:aws:iot:us-west-2:<>:topic/topic_2"
]
},
{
"Effect": "Allow",
"Action": [
"iot:Subscribe"
],
"Resource": [
"arn:aws:iot:us-west-2:<>:topicfilter/sensors/realtime",
"arn:aws:iot:us-west-2:<>:topicfilter/sdk/test/java",
"arn:aws:iot:us-west-2:<>:topicfilter/sdk/test/Python",
"arn:aws:iot:us-west-2:<>:topicfilter/topic_1",
"arn:aws:iot:us-west-2:<>:topicfilter/topic_2"
]
},
{
"Effect": "Allow",
"Action": [
"iot:Connect"
],
"Resource": [
"arn:aws:iot:us-west-2:<>:client/JavaClient2",
"arn:aws:iot:us-west-2:<>:client/sdk-java",
"arn:aws:iot:us-west-2:<>:client/basicPubSub",
"arn:aws:iot:us-west-2:<>:client/sdk-nodejs-*"
]
}
]
}
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