MQTT
- Client
  - Callback
- ClientBase
  - Request
  - SendResult
- ConnectError
- Error
- Header
- Monotonic
- NotConnectedError
- PacketError
- Pending
- ProtocolError
- QoS
- Reconnect
- RequestType
- SubscriptionError
- TimeoutError
- Transport
  - TCP
  - Websocket
- V3
  - Ack
  - Client
    - Callback
  - Connack
  - Connect
  - Disconnect
  - EmptyPacket
  - Header
  - Pingreq
  - Pingresp
  - Puback
  - Pubcomp
  - Publish
  - Pubrec
  - Pubrel
  - Suback
  - Subscribe
  - SubTopic
  - Unsuback
  - Unsubscribe
  - UnsubTopic
- V5
  - Ack
  - Auth
  - Client
    - Authenticator
    - Callback
  - Connack
  - Connect
  - Disconnect
  - EmptyPacket
  - Header
  - Pingreq
  - Pingresp
  - Properties
  - Property
  - PropertyId
  - PropertyType
  - Puback
  - Pubcomp
  - Publish
  - Pubrec
  - Pubrel
  - ReasonCode
  - ReasonCoded
  - Reasoned
  - RetainHandling
  - Suback
  - Subscribe
  - SubTopic
  - Unsuback
  - Unsubscribe
  - UnsubTopic
- VariableByteInteger
- Version

Generated using Crystal 1.16.3
2026-08-10 20:46:31 UTC

class MQTT::SubscriptionError

MQTT::SubscriptionError
MQTT::Error
Exception
Reference
Object

Overview

Raised when a subscription could not be established

Defined in:

mqtt/base.cr