This function registers a callback function to handle notification data for a characteristic.
Notification data is used for events that do not need a response.
The callback can be released by calling bleNotifyRelease.
Input:
dev: SYSHANDLE
Handle to the device.
char : UINT
The ID of the characteristic.
func: CALLBACK
The function to call when a notification is received. See the callback declaration below.
arg: DINT
User argument to pass on to the callback.
Returns: INT
1
|
-
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_BLE_OK
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Success
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0
|
-
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_BLE_ERR_NOT_SUPPORTED
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|
The API is not supported.
|
-1
|
-
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_BLE_ERR_NOT_OPEN
|
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The interface is not powered(see blePower).
|
-7
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_BLE_ERR_NO_RES
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Too many notification callbacks have been registered.
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-8
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-
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_BLE_ERR_INVAL
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Characteristic does not support notification.
|
-9
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-
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_BLE_ERR_NODATA
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Characteristic not found
|
-13
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_BLE_ERR_STATE
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Not allowed to read at this time.
|
-19
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-
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_BLE_ERR_NOT_CONNECTED
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|
Device is not connected.
|
-17
|
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_BLE_ERR_TIMEOUT
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|
Timed out when trying to enable notification.
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-20
|
-
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_BLE_ERR_INVAL_HANDLE
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|
Invalid handle.
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-21
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-
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_BLE_ERR_NO_CACHE
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|
No cache found, use bleServiceCacheUpdate to update the cache.
|
-99
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-
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_BLE_ERR_GENERIC
|
|
Failed to enable notification
|
Declaration:
FUNCTION bleNotifyRegister : INT;
VAR_INPUT
dev : SYSHANDLE;
char : INT;
func : CALLBACK;
arg : DINT;
END_VAR;
Callback declaration:
FUNCTION CALLBACK bleNotifyCb : INT;
VAR_INPUT
dev : SYSHANDLE;
service : UINT;
char : UINT;
data : PTR;
len : INT;
arg : DINT;
END_VAR;
Example:
FUNCTION CALLBACK bleNotifyCb;
VAR_INPUT
dev : SYSHANDLE;
service : UINT;
char : UINT;
data : PTR;
len : INT;
arg : DINT;
END_VAR;
VAR
str : STRING;
END_VAR;
str:=strFromMemory(src:=data, len:=len);
DebugFmt(message:="\1.\2: "+str, v1:=service, v2:=char);
END_FUNCTION;
...
rc := bleNotifyRegister(dev := dev, char := 10, func:=@bleNotifyCb);
...
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