| type | string | Yes| Event type. The value is **wifiStateChange**.|
| callback | Callback<number> | No| Callback used to return the WLAN state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the WLAN state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
**Example**
```js
...
...
@@ -1909,7 +1909,7 @@ Unregisters the WLAN connection state change events.
| type | string | Yes| Event type. The value is **wifiConnectionChange**.|
| callback | Callback<number> | No| Callback used to return the WLAN connection state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the WLAN connection state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('wifiScanStateChange')<sup>7+</sup>
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@@ -1952,7 +1952,7 @@ Unregisters the WLAN scan state change events.
| type | string | Yes| Event type. The value is **wifiScanStateChange**.|
| callback | Callback<number> | No| Callback used to return the WLAN scan state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the WLAN scan state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('wifiRssiChange')<sup>7+</sup>
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@@ -1988,7 +1988,7 @@ Unregisters the RSSI change events.
| type | string | Yes| Event type. The value is **wifiRssiChange**.|
| callback | Callback<number> | No| Callback used to return the RSSI. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the RSSI. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('hotspotStateChange')<sup>7+</sup>
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...
@@ -2033,7 +2033,7 @@ Unregisters the hotspot state change events.
| type | string | Yes| Event type. The value is **hotspotStateChange**.|
| callback | Callback<number> | No| Callback used to return the hotspot state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the hotspot state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('p2pStateChange')<sup>8+</sup>
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...
@@ -2078,7 +2078,7 @@ Unregisters the P2P state change events.
| type | string | Yes| Event type. The value is **p2pStateChange**.|
| callback | Callback<number> | No| Callback used to return the P2P state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the P2P state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('p2pConnectionChange')<sup>8+</sup>
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@@ -2114,7 +2114,7 @@ Unregisters the P2P connection state change events.
| type | string | Yes| Event type. The value is **p2pConnectionChange**.|
| callback | Callback<[WifiP2pLinkedInfo](#wifip2plinkedinfo8)> | No| Callback used to return the P2P connection state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<[WifiP2pLinkedInfo](#wifip2plinkedinfo8)> | No| Callback for the P2P connection state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('p2pDeviceChange')<sup>8+</sup>
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@@ -2150,7 +2150,7 @@ Unregisters the P2P device state change events.
| type | string | Yes| Event type. The value is **p2pDeviceChange**.|
| callback | Callback<[WifiP2pDevice](#wifip2pdevice8)> | No| Callback used to return the P2P device state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<[WifiP2pDevice](#wifip2pdevice8)> | No| Callback for the P2P device state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('p2pPeerDeviceChange')<sup>8+</sup>
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@@ -2186,7 +2186,7 @@ Unregisters the P2P peer device state change events.
| type | string | Yes| Event type. The value is **p2pPeerDeviceChange**.|
| callback | Callback<[WifiP2pDevice[]](#wifip2pdevice8)> | No| Callback used to return the peer device state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<[WifiP2pDevice[]](#wifip2pdevice8)> | No| Callback for the peer device state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| type | string | Yes| Event type. The value is **p2pPersistentGroupChange**.|
| callback | Callback<void> | No| Callback used to return the P2P persistent group state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<void> | No| Callback for the P2P persistent group state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
## wifi.on('p2pDiscoveryChange')<sup>8+</sup>
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@@ -2265,4 +2265,4 @@ Unregisters the P2P device discovery state change events.
| type | string | Yes| Event type. The value is **p2pDiscoveryChange**.|
| callback | Callback<number> | No| Callback used to return the P2P device discovery state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
| callback | Callback<number> | No| Callback for the P2P device discovery state. If this parameter is not specified, all callbacks associated with the specified event will be unregistered.|
The API is supported, but certain features in the API, such as the algorithm, are not supported.
**Procedure**
Modify the parameters and use the features supported.
## 12000002 Missing Key Algorithm Parameter
**Error Message**
Failed to obtain `${messageInfo}`. It is not set in ParamSet.
**Possible Causes**
The key parameter is not set.
**Procedure**
1. Determine the missing parameter from the error message.
2. Set the parameter.
## 12000003 Invalid Key Algorithm Parameter
**Error Message**
Invalid `${messageInfo}`.
**Possible Causes**
An invalid parameter is found.
**Procedure**
1. Determine the invalid parameter from the error message.
2. Correct the invalid parameter.
## 12000004 File Error
**Error Message**
Failed to read the file.
Failed to write the file.
**Possible Causes**
The file operation failed.
**Procedure**
1. Check whether the disk space is used up and whether the file system is abnormal.
2. Clear the disk space.
## 12000005 IPC Error
**Error Message**
IPC timed out.
Failed to obtain messages from IPC.
**Possible Causes**
IPC failed.
**Procedure**
Locate and rectify the IPC failure.
## 12000006 Algorithm Library Operation Failed
**Error Message**
Crypto engine error.
**Possible Causes**
The algorithm library operation fails. The possible causes include the following:
1. The encryption and decryption on the algorithm library failed due to incorrect ciphertext data.
2. Incorrect key parameters exist.
**Procedure**
1. Check and correct the ciphertext data.
2. Check and correct the key parameters.
## 12000007 Failed to Access the Key Due to Invalidated Credential
**Error Message**
This credential is invalidated permanently.
**Possible Causes**
The possible causes include the following:
1. The key is configured with the user access control attribute and becomes invalid after the password is cleared.
2. The key is configured with the user access control attribute and becomes invalid after a new biometric feature is enrolled.
**Procedure**
1. Locate the cause of the authentication failure based on the log.
2. If the authentication fails due to the access control attribute configured, the key cannot be used any more.
## 12000008 Failed to Access the Key Due to a Failure in Authentication Token Verification
**Error Message**
The authentication token verification failed.
**Possible Causes**
The authentication token verification failed due to an incorrect challenge value.
**Procedure**
1. Check whether the challenge for userIAM authentication is correctly assembled.
2. If the challenge value is incorrect, modify the assembly mode, use the bytes generated by HUKS to assembly challenge value, and pass it to userIAM for authentication.
## 12000009 Key Access Timed Out
**Error Message**
The Authentication token timed out.
**Possible Causes**
The authentication failed because the authentication token timed out.
**Procedure**
The difference between the current time and the authentication token generation time must be less than the timeout interval. Otherwise, the access will be rejected.
## 12000010 Key Operation Sessions Reaches the Limit
**Error Message**
The number of key operation sessions has reached the limit.
**Possible Causes**
The number of concurrent key operation sessions has reached the maximum (15).
**Procedure**
1. Check whether there are multiple key session operations (**init** operations) for the same application. If yes, modify the code to avoid concurrent invoking.
2. If the key operation sessions are set up for different applications, wait until the sessions are released.
## 12000011 The Entity Does Not Exist
**Error Message**
The entity does not exist.
**Possible Causes**
The key corresponding to the key alias does not exist.
**Procedure**
1. Check whether the key alias is misspelled.
2. Check whether the key corresponding to the key alias is successfully generated.
## 12000012 External Error
**Error Message**
External error `${messageInfo}`.
**Possible Causes**
An external error, such as a hardware fault or file error occurs.
**Procedure**
Provide the error code and log information to the related party.
## 12000013 The Credential Does Not Exist
**Error Message**
The credential does not exist.
**Possible Causes**
The credential, such as the PIN, fingerprint, or face image, is not enrolled.
**Procedure**
Enroll the credential or change the authentication type bound to the key.
## 12000014 Insufficient Memory
**Error Message**
Memory is insufficient.
**Possible Causes**
The system memory is insufficient.
**Procedure**
Release memory or restart the device.
## 12000015 Failed to Invoke Other System Services
**Error Message**
Failed to call the `${messageInfo}` service to do `${messageInfo}`.
**Possible Causes**
The called system service has not started.
**Procedure**
Wait for the system service to start and call the API again.
