MqttConnectionCode constants

The return value after an MQTT client attempts to establish a connection, indicating the result of the connection behavior.

MqttConnectionAdministrativeAction

(152) - The connection is closed due to an administrative action.

MqttConnectionBadAuthenticationMethod

(140) - The authentication method is not supported or does not match the authentication method currently in use.

MqttConnectionBadUserNameOrPassword

(134) - The server does not accept the username or password specified by the client.

MqttConnectionBanned

(138) - The client has been banned by an administrative action. Contact the server administrator.

MqttConnectionClientIdentifierNotValid

(133) - The client identifier is a valid string but is not allowed by the server.

MqttConnectionImplementationSpecificError

(131) - The connection is valid but is not accepted by the server.

MqttConnectionKeepAliveTimeout

(141) - The connection is closed because no packet has been received for 1.5 times the keep alive time.

MqttConnectionMalformedPacket

(129) - Data within the connection packet could not be correctly parsed.

MqttConnectionMaximumConnectTime

(160) - The maximum connection time authorized for this connection has been exceeded.

MqttConnectionNotAuthorized

(135) - The client is not authorized to connect.

MqttConnectionPacketIdentifierInUse

(145) - The packet identifier is already in use. This might indicate a mismatch in the session state between the client and server.

MqttConnectionPacketTooLarge

(149) - The connection packet exceeded the maximum permissible size.

MqttConnectionPayloadFormatInvalid

(153) - The will payload does not match the specified payload format indicator.

MqttConnectionProtocolError

(130) - Data in the connection packet does not conform to this specification.

MqttConnectionQoSNotSupported

(155) - The server does not support the QoS set in will QoS.

MqttConnectionQuotaExceeded

(151) - An implementation or administrative imposed limit has been exceeded.

MqttConnectionRateExceeded

(159) - The connection rate limit has been exceeded.

MqttConnectionReceiveMaximumExceeded

(147) - The client or server has received more than receive maximum publication for which it has not sent PUBACK or PUBCOMP.

MqttConnectionRetainNotSupported

(154) - The server does not support retained messages, and will retain was set to 1.

MqttConnectionServerBusy

(137) - The server is busy. Try again later.

MqttConnectionServerMoved

(157) - The client should permanently use another server.

MqttConnectionServerShuttingDown

(139) - The server is shutting down.

MqttConnectionServerUnavailable

(136) - The MQTT server is not available.

MqttConnectionSessionTakenOver

(142) - Another connection using the same client ID has connected causing this connection to be closed.

MqttConnectionSuccess

(0) - The connection is accepted.

MqttConnectionTopicNameinvalid

(144) - The will topic name is not malformed but is not accepted by this server.

MqttConnectionUnspecifiedError

(128) - The server does not wish to reveal the reason for the failure, or none of the other reason codes apply.

MqttConnectionUnsupportedProtocolVersion

(132) - The server does not support the version of the MQTT protocol requested by the client.

MqttConnectionUseAnotherServer

(156) - The client should temporarily use another server.