MQTT Client Error Codes

Error code (Decimal)	Error code (Hex)	Meaning
0	0x0	No Error
1	0x1	Connection Refused: Unacceptable protocol version
10	0xa	Timeout waiting for SUBACK
11	0xb	Timeout waiting for UNSUBACK
12	0xc	Timeout waiting for PINGRESP
13	0xd	Malformed Remaining Length
14	0xe	Problem with the underlying communication port
15	0xf	Address could not be parsed
16	0x10	Malformed received MQTT packet
17	0x11	Subscription failure
18	0x12	Payload decoding failure
19	0x13	Failed to compile a Decoder
2	0x2	Connection Refused: Identifier rejected
20	0x14	The received MQTT packet type is not supported on this client
21	0x15	Timeout waiting for PUBACK
22	0x16	Timeout waiting for PUBREC
23	0x17	Timeout waiting for PUBCOMP
3	0x3	Connection Refused: Server Unavailable
4	0x4	Connection Refused: Bad username or password
5	0x5	Connection Refused: Authorization error
6	0x6	Connection lost or bad
7	0x7	Timeout waiting for Length bytes
8	0x8	Timeout waiting for Payload
9	0x9	Timeout waiting for CONNACK