MQTT_PROTOCOL_T

Last published : Oct 30, 2026
Models the MQTT message types
This topic lists the expressions that are provided by this class.
  • AUTH
    Operates on MQTT AUTH message
Returns: mqtt_auth_t
  • COMMAND
    Return the MQTT command type
Returns: mqtt_command_e
  • CONNACK
    Operates on MQTT CONNACK message
Returns: mqtt_connack_t
  • CONNECT
    Operates on MQTT CONNECT message
Returns: mqtt_connect_t
  • DISCONNECT
    Operates on MQTT Disconnect message
Returns: mqtt_disconnect_t
  • FROM_CLIENT
    Returns true if the MQTT message is received from Client
Returns: bool_at
  • FROM_SERVER
    Returns true if the MQTT message is received from Server
Returns: bool_at
  • HEADER
    Return the MQTT fixed header
Returns: mqtt_header_t
  • MESSAGE_LENGTH
    Return the length of the MQTT message
Returns: num_at
NEW_CONNACK (uint errcode)
Creates a new MQTT CONNACK message based on error code. The admin must make sure that the error code being configured is valid as per the protocol version.
Parameters``:
            errcode- Error Code
Returns: text_t
  • PUBACK
    Operates on MQTT PUBACK message.
Returns: mqtt_puback_t
  • PUBCOMP
    Operates on MQTT PUBCOMP message.
Returns: mqtt_pubcomp_t
  • PUBLISH
    Operates on MQTT PUBLISH message.
Returns: mqtt_publish_t
  • PUBREC
    Operates on MQTT PUBREC message.
Returns: mqtt_pubrec_t
  • PUBREL
    Operates on MQTT PUBREL message.
Returns: mqtt_pubrel_t
  • SUBACK
    Operates on MQTT SUBACK message.
Returns: mqtt_suback_t
  • SUBSCRIBE
    Operates on MQTT SUBSCRIBE message.
Returns: mqtt_subscribe_t
  • UNSUBACK
    Operates on MQTT UNSUBACK message
Returns: mqtt_unsuback_t
  • UNSUBSCRIBE
    Operates on MQTT UNSUBSCRIBE message
Returns: mqtt_unsubscribe_t
  • VERSION
    Return the MQTT protocol version
Returns: num_at