This function will find a service on the device that matches a specific UUID.
If the device has multiple services with the same UUID, this function can be called with incrementing index until it returns -9 (_BLE_ERR_NODATA).
The service can then be used by either bleCharGet or bleCharFind to find the wanted characteristics.
Input:
dev: SYSHANDLE
Handle to the device to get the service from.
UUID : STRING
The UUID of this service to find.
Three types of UUID are supported:
16-bit: "2a06"
32-bit: "00002a06"
128-bit: "00002a06-0000-1000-8000-00805f9b34fb"
idx: INT (default 0)
Zero-based index of the service to read.
Output:
service : UINT
The ID of the service.
primary : BOOL
TRUE if this is a primary service.
Returns: INT
1
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-
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_BLE_OK
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Success
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0
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-
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_BLE_ERR_NOT_SUPPORTED
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The API is not supported.
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-1
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-
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_BLE_ERR_NOT_OPEN
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The interface is not powered(see blePower).
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-4
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-
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_BLE_ERR_NOT_FOUND
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Failed to find device.
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-8
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_BLE_ERR_INVAL
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Invalid UUID
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-9
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_BLE_ERR_NODATA
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Service not found.
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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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_BLE_ERR_NO_CACHE
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No cache found, use bleServiceCacheUpdate to update the cache.
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Declaration:
FUNCTION bleServiceFind : INT;
VAR_INPUT
dev : SYSHANDLE;
uuid : STRING;
idx : INT := 0;
service : ACCESS UINT;
primary : ACCESS BOOL;
END_VAR;
Example:
FUNCTION ShowCharsForService;
VAR_INPUT
dev : SYSHANDLE;
service : STRING;
END_VAR;
VAR
i : INT;
s, c : UINT;
rc : INT;
uuid : STRING;
primary : BOOL;
flags : DINT;
END_VAR;
DebugMsg(message := "-- Service: --");
rc := bleServiceFind(dev:=dev, uuid:=service, service:=s, primary := primary);
IF rc = _BLE_OK THEN
DebugFmt(message := " Service: \1, primary: \2", v1 := s, v2 := INT(primary));
i := 0;
REPEAT
rc:= bleCharGet(dev := dev, service := s, idx := i, char := c, uuid := uuid, flags := flags);
IF rc = _BLE_OK THEN
DebugFmt(message := " Char: \1, flags: " + dintToHex(v := flags) + ", UUID: " + UUID, v1 := c);
ELSE
DebugFmt(message := " End(\2): \1", v1 := rc, v2 := i);
END_IF;
i := i + 1;
UNTIL rc <> _BLE_OK
END_REPEAT;
ELSE
DebugFmt(message:="bleServiceFind failed: \1", v1:=rc);
END_IF;
END_FUNCTION;
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