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Component: mqtt_session

MQTTv5 session implementation.

Client Session

Client Session State

  1. Upstream publish packets

QoS 1 and QoS 2 messages which have been sent to the Server, but have not been completely acknowledged.

  1. Downstream publish packets

QoS 2 messages which have been received from the Server, but have not been completely acknowledged.

  1. Online knowledge

These knowledge are not preserved across Network Connections

  • send_quota for flow control only for QoS > 0
  1. Offline knowledge
  • session_expire_at Time session will expire on the remote.

Client Session functions

  1. retry message after reconnect

Server Session

Server Session State

  1. Ongoing Sessions.

  2. Client subscriptions.

  3. Inflight downstream publish packets.

    QoS 1 and QoS 2 messages which have been sent to the Client, but have not been completely acknowledged.

  4. Buffered publish packets.

    QoS 1 and QoS 2 messages pending transmission to the Client and OPTIONALLY QoS 0 messages pending transmission to the Client.

  5. Unacked upstream publish packets.

    QoS 2 messages which have been received from the Client, but have not been completely acknowledged.

  6. Session expire time

    The session expire time if client is offline.