Cannot connect to AWS IoT core: "Exception while decoding CONNACK: remaining length too short"

[alex-vovk]

Expected behavior

Connected to the AWS IoT Core and subscribed to the topic.

Actual behavior

Connection fails. The following output is provided:

Client 'UNKNOWN@private-endpoint.iot.us-east-1.amazonaws.com' sending CONNECT MqttConnect{keepAlive=60, cleanStart=true, sessionExpiryInterval=0}
Client 'UNKNOWN@private-endpoint.iot.us-east-1.amazonaws.com' DISCONNECTED Exception while decoding CONNACK: remaining length too short
Exception while decoding CONNACK: remaining length too short

To Reproduce

Steps

Run from the terminal: mqtt-cli.exe subscribe --topic "#" --showTopics --host private-endpoint.us-east-1.amazonaws.com --port 8883 --secure --cert certificate.pem.crt --key private.pem.key --verbose --debug

Reproducer code

Details

• Affected MQTT CLI version(s):
• Used JVM version:

  4.5.1
  Picocli 4.5.0
  JVM: 14 (Oracle Corporation Java HotSpot(TM) 64-Bit Server VM 14+36-1461)
  OS: Windows 10 10.0 amd64

Workaround

Add switch to MQTT 3 and set QOS to 0 by adding the following parameters: '--mqttVersion 3 --qos 0' For example: mqtt-cli.exe subscribe --topic "#" --showTopics --host private-endpoint.us-east-1.amazonaws.com --port 8883 --secure --cert certificate.pem.crt --key private.pem.key --verbose --debug --mqttVersion 3 --qos 0

[MicWalter]

I'm closing this issue as at the time where you reported this issue AWS IoT core did not support MQTT5 and you ran into this issue: https://github.com/hivemq/hivemq-mqtt-client/issues/327

As AWS added MQTT 5 support it should work now