I'm sending a message to "config" topic from my Spring boot backend application
Here's my mqtt setup
final String mqttServerAddress =
String.format("ssl://%s:%s", options.mqttBridgeHostname, options.mqttBridgePort);
// Create our MQTT client. The mqttClientId is a unique string that identifies this device. For
// Google Cloud IoT Core, it must be in the format below.
final String mqttClientId =
String.format(
"projects/%s/locations/%s/registries/%s/devices/%s",
options.projectId, options.cloudRegion, options.registryId, options.deviceId);
MqttConnectOptions connectOptions = new MqttConnectOptions();
// Note that the Google Cloud IoT Core only supports MQTT 3.1.1, and Paho requires that we
// explictly set this. If you don't set MQTT version, the server will immediately close its
// connection to your device.
connectOptions.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1_1);
Properties sslProps = new Properties();
sslProps.setProperty("com.ibm.ssl.protocol", "TLSv1.2");
connectOptions.setSSLProperties(sslProps);
// With Google Cloud IoT Core, the username field is ignored, however it must be set for the
// Paho client library to send the password field. The password field is used to transmit a JWT
// to authorize the device.
connectOptions.setUserName(options.userName);
DateTime iat = new DateTime();
if ("RS256".equals(options.algorithm)) {
connectOptions.setPassword(
createJwtRsa(options.projectId, options.privateKeyFile).toCharArray());
} else if ("ES256".equals(options.algorithm)) {
connectOptions.setPassword(
createJwtEs(options.projectId, options.privateKeyFileEC).toCharArray());
} else {
throw new IllegalArgumentException(
"Invalid algorithm " + options.algorithm + ". Should be one of 'RS256' or 'ES256'.");
}
// [START iot_mqtt_publish]
// Create a client, and connect to the Google MQTT bridge.
MqttClient client = new MqttClient(mqttServerAddress, mqttClientId, new MemoryPersistence());
// Both connect and publish operations may fail. If they do, allow retries but with an
// exponential backoff time period.
long initialConnectIntervalMillis = 500L;
long maxConnectIntervalMillis = 6000L;
long maxConnectRetryTimeElapsedMillis = 900000L;
float intervalMultiplier = 1.5f;
long retryIntervalMs = initialConnectIntervalMillis;
long totalRetryTimeMs = 0;
while ((totalRetryTimeMs < maxConnectRetryTimeElapsedMillis) && !client.isConnected()) {
try {
client.connect(connectOptions);
} catch (MqttException e) {
int reason = e.getReasonCode();
// If the connection is lost or if the server cannot be connected, allow retries, but with
// exponential backoff.
System.out.println("An error occurred: " + e.getMessage());
if (reason == MqttException.REASON_CODE_CONNECTION_LOST
|| reason == MqttException.REASON_CODE_SERVER_CONNECT_ERROR) {
System.out.println("Retrying in " + retryIntervalMs / 1000.0 + " seconds.");
Thread.sleep(retryIntervalMs);
totalRetryTimeMs += retryIntervalMs;
retryIntervalMs *= intervalMultiplier;
if (retryIntervalMs > maxConnectIntervalMillis) {
retryIntervalMs = maxConnectIntervalMillis;
}
} else {
throw e;
}
}
}
attachCallback(client, options.deviceId);
// The MQTT topic that this device will publish telemetry data to. The MQTT topic name is
// required to be in the format below. Note that this is not the same as the device registry's
// Cloud Pub/Sub topic.
String mqttTopic = String.format("/devices/%s/%s", options.deviceId, options.messageType);
long secsSinceRefresh = ((new DateTime()).getMillis() - iat.getMillis()) / 1000;
if (secsSinceRefresh > (options.tokenExpMins * MINUTES_PER_HOUR)) {
System.out.format("\tRefreshing token after: %d seconds%n", secsSinceRefresh);
iat = new DateTime();
if ("RS256".equals(options.algorithm)) {
connectOptions.setPassword(
createJwtRsa(options.projectId, options.privateKeyFile).toCharArray());
} else if ("ES256".equals(options.algorithm)) {
connectOptions.setPassword(
createJwtEs(options.projectId, options.privateKeyFileEC).toCharArray());
} else {
throw new IllegalArgumentException(
"Invalid algorithm " + options.algorithm + ". Should be one of 'RS256' or 'ES256'.");
}
client.disconnect();
client.connect(connectOptions);
attachCallback(client, options.deviceId);
}
MqttMessage message = new MqttMessage(data.getBytes(StandardCharsets.UTF_8.name()));
message.setQos(1);
client.publish(mqttTopic, message);
here's the options class
public class MqttExampleOptions {
String mqttBridgeHostname = "mqtt.googleapis.com";
short mqttBridgePort = 8883;
String projectId =
String cloudRegion = "europe-west1";
String userName = "unused";
String registryId = <I don't want to show>
String gatewayId = <I don't want to show>
String algorithm = "RS256";
String command = "demo";
String deviceId = <I don't want to show>
String privateKeyFile = "rsa_private_pkcs8";
String privateKeyFileEC = "ec_private_pkcs8";
int numMessages = 100;
int tokenExpMins = 20;
String telemetryData = "Specify with -telemetry_data";
String messageType = "config";
int waitTime = 120
}
When I try to publish message to topic "config" I get this error
ERROR 12556 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service()
for servlet [dispatcherServlet] in context with path [/iot-admin] threw exception [Request processing failed; nested exception is Connection Lost (32109) - java.io.EOFException] with root cause
java.io.EOFException: null
at java.base/java.io.DataInputStream.readByte(DataInputStream.java:273) ~[na:na]
at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92) ~[org.eclipse.paho.client.mqttv3-1.2.5.jar:na]
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:137) ~[org.eclipse.paho.client.mqttv3-1.2.5.jar:na]
this is the message I am sending
{
"Led": {
"id": "e36b5877-2579-4db1-b595-0e06410bde11",
"rgbColors": [{
"id": "1488acfe-baa7-4de8-b4a2-4e01b9f89fc5",
"configName": "Terminal",
"rgbColor": [150, 150, 150]
}, {
"id": "b8ce6a35-4219-4dba-a8de-a9070f17f1d2",
"configName": "PayZone",
"rgbColor": [150, 150, 150]
}, {
"id": "bf62cef4-8e22-4804-a7d8-a0996bef392e",
"configName": "PayfreeLogo",
"rgbColor": [150, 150, 150]
}, {
"id": "c62d25a4-678b-4833-9123-fe3836863400",
"configName": "BagDetection",
"rgbColor": [200, 200, 200]
}, {
"id": "e19e1ff3-327e-4132-9661-073f853cf913",
"configName": "PersonDetection",
"rgbColor": [150, 150, 150]
}]
}
}
How can I properly send a message to a config topic without getting this error? I am able to send message to "state" topic, but not to "config" topic.