Response Error Codes

System Framework Error Codes

Error Code	Description
0	Success
1	Command not supported (included in the Combo framework but not ported or adapted on the current platform)
2	Command parameter contains an unsupported operation (the current platform supports only part of the operations for this command)
3	Invalid command format (incorrect number of parameters, e.g., two parameters required but only one provided)
4	Parameter error (invalid parameter value, e.g., a digit 0–9 is required but 10 or xyz was provided)
5	Parameter length error (command length exceeds the maximum supported length)
31	Current command not finished; status must be reported asynchronously. This value is used by the state machine for command handling and is not returned as a message.
32	Unknown error (or unhandled error type)
3	Invalid command format (incorrect number of parameters, e.g., two parameters required but only one provided)

Common General Error Codes

Error Code	Description
33	malloc error
34	Failed to read buffer
35	Failed to write buffer
36	Configuration error (invalid configuration loaded from memory, e.g., OTA upgrade port set to -1; a configuration error is reported when AT+OTA checks the port)
37	Failed to create task
38	Flash read/write failed
39	UART configuration error: unsupported baud rate
40	UART configuration error: unsupported data bits
41	UART configuration error: unsupported stop bits
42	UART configuration error: unsupported parity
43	UART configuration error: unsupported flow control
44	UART configuration failed
45	Incorrect username/password
46	Low-power mode error or unsupported low-power mode
47	Uninitialized configuration data error (including IO mapping data)
63	General error code (no additional information)

Wi-Fi Error Codes

Error Code	Description
64	Wi-Fi not initialized or initialization failed
65	Wi-Fi mode error (cannot connect to Wi-Fi in AP-only mode)
66	Wi-Fi connection failed
67	Wi-Fi connected but failed to obtain IP (DHCP error)
68	Failed to get encryption method
69	Specified AP not found during scan
70	Failed to start Wi-Fi scan
71	Wi-Fi scan timed out
72	Failed to start AP hotspot
73	Failed to get router Wi-Fi information or locally started AP information
74	Network interface (STA/AP) not running
75	Wi-Fi country code error (unsupported Wi-Fi country code)
76	Current network provisioning mode error
95	Unknown Wi-Fi connection error

Socket Error Codes

Error Code	Description
96	Failed to create socket
97	Socket connection failed
98	DNS failed
99	Socket state error (e.g., TCP not connected yet)
100	Socket type error
101	Socket send failed
102	Socket receive failed
103	Failed to create socket monitor thread
104	Socket bind error
105	Transparent transmission not available for current connection (incorrect socket type or count)
106	PING test failed (100% packet loss)
107	Wi-Fi country code error (unsupported Wi-Fi country code)
108	SSL config error
109	SSL verification error (usually caused by unsupported SSL cipher type or invalid certificate)
127	Unknown socket error

GPIO Control Error Codes

Error Code	Description
128	GPIO mode error (e.g., configured as input but an output command was executed)
129	IO not in GPIO mapping table (e.g., pins 0–4 are mapped but pin 5 was accessed)
130	NC pin; cannot be controlled (e.g., UART, VCC, GND pins cannot be controlled via AT commands)
131	Pin mode setting error or unsupported mode
132	GPIO pull-up/pull-down setting error or unsupported pull mode
133	PWM period not supported by hardware
159	Unknown GPIO operation error

HTTP(S) Error Codes

Error Code	Description
160	HTTP(S) response header format error
191	Unknown HTTP(S) request error

MQTT Related

Error Code	Description
192	MQTT connection method error
193	MQTT connection failed
194	MQTT configuration error
195	Failed to publish MQTT message
196	MQTT subscription list is full
197	No MQTT response received
198	MQTT busy or connection timed out
224	Unknown MQTT error

BLE Bluetooth Related

Error Code	Description
225	Bluetooth start or stop error
226	Failed to set Bluetooth MAC address
227	Bluetooth MAC address modification not supported
228	Unsupported state or operation not allowed in the current state
229	Failed to disconnect Bluetooth
230	Failed to set Bluetooth MTU (see 236 for MTU retrieval failure)
231	Failed to send Bluetooth data
232	Failed to set Bluetooth peripheral advertising state
233	Bluetooth central scan failed
234	Specified Bluetooth device not found during scan
235	Bluetooth connection failed
236	Failed to get MTU (see 230 for MTU setting failure)
237	Failed to get Bluetooth MAC address (226: set Bluetooth MAC; 237: get Bluetooth MAC failed)