MQTT Error/Reason Codes

Topic: CM201

Error List: MQTT Ver3.1.1
Decimal	Hex	Description
0	0	No error occurred.
1	0x01	The broker does not accept a connection using the specified protocol version.
2	0x02	The client ID is invalid. This might be related to its length.
3	0x03	The network connection has been established, but the service is unavailable on the broker side.
4	0x04	The user name or password specified is invalid.
5	0x05	The client is not authorized to connect.
256	0x100	The underlying transport caused an error. For example, the connection might have been interrupted unexpectedly.
257	0x101	The client encountered a protocol violation, and therefore closed the connection.
258	0x102	An unknown error occurred.
259	0x103	The error is related to MQTT protocol level 5. A reason code might provide more details.

Reason Code: MQTT Ver5.0
Decimal	Hex	Description
—	0	The specified action has succeeded.
—	0	A subscription with QoS level 0 has been created.
1	0x01	A subscription with QoS level 1 has been created.
2	0x02	A subscription with QoS level 2 has been created.
16	0x10	The Message has been accepted by the server, but there are no subscribers to receive this message. A broker may send this reason code instead of Success.
17	0x11	No matching topic filter is being used by the client.
24	0x18	Continue the authentication with another step.
25	0x19	Initiate a re-authentication.
128	0x80	An unspecified error occurred.
129	0x81	The packet sent to the server is invalid.
130	0x82	A protocol error has occurred. In most cases, this will cause the server to disconnect the client.
131	0x83	The packet is valid, but the recipient rejects it.
132	0x84	The requested protocol version is not supported by the server.
133	0x85	The client ID is invalid.
134	0x86	The user name or password specified is invalid.
135	0x87	The client is not authorized for the specified action.
136	0x88	The server to connect to is not available.
137	0x89	The server to connect to is not available. The client is asked to try at a later time.
138	0x8A	The client has been banned from the server.
140	0x8C	The authentication method specified is invalid.
143	0x8F	The topic filter specified is invalid.
144	0x90	The topic name specified is invalid.
145	0x91	The Message ID used in the previous packet is already in use.
146	0x92	The Message ID used in the previous packet has not been found.
149	0x95	The packet received is too large.
151	0x97	An administratively imposed limit has been exceeded.
153	0x99	The payload format is invalid. See also
154	0x9A	The server does not support retained messages.
155	0x9B	The QoS level requested is not supported.
156	0x9C	The server the client tries to connect to is not available.
157	0x9D	The server the client tries to connect to has moved to a new address.
158	0x9E	Shared subscriptions are not supported.
159	0x9F	The connection rate limit has been exceeded.
161	0xA1	Subscription IDs are not supported.
162	0xA2	Subscriptions using wild cards are not supported by the server.

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