malformed_packet

The packet is malformed

packet_too_large

The packet has exceeded the Maximum Packet Size the Server is willing to accept

session_expired

The Client's session does not exist or it has expired

pid_overrun

There are no more available Packet Identifiers to use

invalid_topic

The Topic is invalid and does not conform to the specification

qos_not_supported

The Server does not support the specified qos_e

retain_not_available

The Server does not support retained messages

topic_alias_maximum_reached

The Client attempted to send a Topic Alias that is greater than Topic Alias Maximum

wildcard_subscription_not_available

The Server does not support Wildcard Subscriptions

subscription_identifier_not_available

The Server does not support this Subscription Identifier

shared_subscription_not_available

The Server does not support Shared Subscriptions