when i use dittoclient, it will disconnect at every 10 minutes ,why?

[AriesMg]

when i use dittoclient, it will disconnect at every 10 minutes ,why?

use client
client.live().forId(thingId)
.message()
.to()
.subject("routercmd")
.timeout(Duration.ofSeconds(60))
.payload(JSONObject.toJSONString(requestBody))
.send(String.class, (response, throwable) -> {
future.complete(response.getPayload().orElse(null));
});
String s = future.get(3000, TimeUnit.MILLISECONDS);
logger.info("call result ={}" ,s);
RouterResponseBody responseBody = JSONObject.parseObject(s, RouterResponseBody.class);

create client
public DittoClient create() throws Exception {
log.info("start create ditto client");
return DittoClients.newInstance(createMessagingProvider())
.connect()
.toCompletableFuture()
.join();

public static MessagingProvider createMessagingProvider() {
    final MessagingConfiguration.Builder builder = WebSocketMessagingConfiguration.newBuilder()
            .endpoint(DITTO_ENDPOINT_URL)
            .jsonSchemaVersion(JsonSchemaVersion.V_2)
            .reconnectEnabled(false);

    final ProxyConfiguration proxyConfiguration;
    if (PROXY_HOST != null && !PROXY_HOST.isEmpty()) {
        proxyConfiguration = ProxyConfiguration.newBuilder()
                .proxyHost(PROXY_HOST)
                .proxyPort(Integer.parseInt(PROXY_PORT))
                .build();
        builder.proxyConfiguration(proxyConfiguration);
    } else {
        proxyConfiguration = null;
    }

    if (DITTO_TRUSTSTORE_LOCATION != null) {
        builder.trustStoreConfiguration(TrustStoreConfiguration.newBuilder()
                .location(DITTO_TRUSTSTORE_LOCATION)
                .password(DITTO_TRUSTSTORE_PASSWORD)
                .build());
    }

    final AuthenticationProvider<WebSocket> authenticationProvider;
    if (DITTO_DUMMY_AUTH_USER != null) {
        authenticationProvider =
                AuthenticationProviders.dummy(DummyAuthenticationConfiguration.newBuilder()
                        .dummyUsername(DITTO_DUMMY_AUTH_USER)
                        .build());
    } else if (DITTO_OAUTH_CLIENT_ID != null && !DITTO_OAUTH_CLIENT_ID.isEmpty()) {
        final ClientCredentialsAuthenticationConfiguration.ClientCredentialsAuthenticationConfigurationBuilder
                authenticationConfigurationBuilder =
                ClientCredentialsAuthenticationConfiguration.newBuilder()
                        .clientId(DITTO_OAUTH_CLIENT_ID)
                        .clientSecret(DITTO_OAUTH_CLIENT_SECRET)
                        .scopes(DITTO_OAUTH_SCOPES)
                        .tokenEndpoint(DITTO_OAUTH_TOKEN_ENDPOINT);
        if (proxyConfiguration != null) {
            authenticationConfigurationBuilder.proxyConfiguration(proxyConfiguration);
        }
        authenticationProvider =
                AuthenticationProviders.clientCredentials(authenticationConfigurationBuilder.build());
    } else {
        authenticationProvider =
                AuthenticationProviders.basic(BasicAuthenticationConfiguration.newBuilder()
                        .username(DITTO_USERNAME)
                        .password(DITTO_PASSWORD)
                        .build());
    }

    return MessagingProviders.webSocket(builder.build(), authenticationProvider);
}

[thjaeckle]

Hi @AriesMg
This sounds like e.g. your infrastructure (e.g. a HTTP reverse proxy) could have a max idle timeout of 10 minutes for open connections.
On which infrastructure do you operate Ditto and which loadbalancers / reverse proxies are in front of Ditto?

[AriesMg]

use nginx as loadbalancers

[thjaeckle]

And did you configure the "/ws/" resource of Ditto accordingly in your nginx config?
There are many resources which explain how to do that, e.g. https://mpolinowski.github.io/docs/Development/Javascript/2021-09-09--websocket-NGINX/2021-09-09/

[AriesMg]

@thjaeckle i want control Thousands Of router via dittclient，how many dittclients should I create on my server？ just 1 enough or need more?

[thjaeckle]

That depends on your use case - which I know nothing about - and mainly amount of messages sent/received.

[AriesMg]

thanks,
i have a new qustion ，every 10 minutes, i will find a mount of error API error ,What is the most likely cause
2023-01-19 10:20:08 [ReadingThread] DEBUG org.eclipse.ditto.client.messaging.internal.WebSocketMessagingProvider:553] Client nginx:ditto:5920353c-b59f-4d02-a63c-37ce5d547bce: Received WebSocket string message
<{"topic":"routerX/MWEWYZM5NJQWMZKW/things/live/messages/routercmd","headers":{"response-required":false,"ditto-connection-id":"mqtt-connection-id","ditto-originator":"nginx:ditto","version":2,"channel":"live",
"timeout":"60000ms","correlation-id":"537d6f0a-5655-4ddc-af59-7daa56465bc2","content-type":"text/plain","ditto-message-thing-id":"routerX:MWEWYZM5NJQWMZKW","ditto-message-subject":"routercmd","ditto-message-dire
ction":"FROM","status":"500"},"path":"/outbox/messages/routercmd","value":"API error","status":500}>

[thjaeckle]

Your device seems to send this error with "value": "API error" (Ditto does not create such meaningless error messages) - Ditto just routes that response error to the original sender of the message.

[thjaeckle]

As there are only new (unrelated) questions and not a feedback on my questions and suggestions, I will close this discsussion (as this is not a discussion).