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wss://.eu-west-1.amazonaws.com:443/mqtt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=/eu-west-1/iotdevicegateway/aws4_request&X-Amz-Date=20250814T085431Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=&X-Amz-Security-Token=

        AwsIotMqttConnectionBuilder builder = AwsIotMqttConnectionBuilder.newMtlsBuilderFromPath(null, null)
.withWebsockets(true) // Crucial for presigned URL connections
.withEndpoint(connectionUrl) // Pass the presigned URL here
.withClientId(clientId)
.withConnectionEventCallbacks(callbacks)
.withWebsocketSigningRegion("eu-west-1")
.withPort(443); // Default WebSocket port

MqttClientConnection connection = builder.build();

// Connect to AWS IoT Core
CompletableFuture connected = connection.connect();
connected.get(); // Wait for connection to complete
< /code>
Ich erhalte den folgenden Fehler, wenn ich den Code ausführe < /p>
java.util.concurrent.ExecutionException: software.amazon.awssdk.crt.mqtt.MqttException: Attempt to sign an http request without credentials

Die vorgewiesene WebSocket -URL ist so etwas wie diese < /p>

[code]wss://.eu-west-1.amazonaws.com:443/mqtt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=/eu-west-1/iotdevicegateway/aws4_request&X-Amz-Date=20250814T085431Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=&X-Amz-Security-Token=[/code]

Und hier ist mein Code
[code] AwsIotMqttConnectionBuilder builder = AwsIotMqttConnectionBuilder.newMtlsBuilderFromPath(null, null)
.withWebsockets(true) // Crucial for presigned URL connections
.withEndpoint(connectionUrl) // Pass the presigned URL here
.withClientId(clientId)
.withConnectionEventCallbacks(callbacks)
.withWebsocketSigningRegion("eu-west-1")
.withPort(443); // Default WebSocket port

MqttClientConnection connection = builder.build();

// Connect to AWS IoT Core
CompletableFuture connected = connection.connect();
connected.get(); // Wait for connection to complete
< /code>
Ich erhalte den folgenden Fehler, wenn ich den Code ausführe < /p>
java.util.concurrent.ExecutionException: software.amazon.awssdk.crt.mqtt.MqttException: Attempt to sign an http request without credentials[/code]