In my app, I scan low energy Bluetooth for specific service uuid 2415
. To convert the string 2415 into uuid I am using UUID serviceUUID = UUID.fromString("2415");
but at this line exception arises IllegalArgumentException: Invalid UUID 2415.
Please help me in this respect I would b very thankful to in this regard. Thanks in advance.
Using the class UUID
An example like this:
UUID.randomUUID().toString()
The accepted answer was provided in a comment by @Michael:
Have you tried combining your short UUID with the Bluetooth base UUID?
I.e. "00002415-0000-1000-8000-00805F9B34FB"? (assuming that you meant
2415 hexadecimal)?
I'm converting that comment to an answer because I missed it first time I read through this thread.
you can use
String str = "1234";
UUID uuid = UUID.nameUUIDFromBytes(str.getBytes());
System.out.print(uuid.toString());
The confusion that may lead many people here is that you can use short code UUIDs to reference bluetooth services and characteristics on other platforms - for instance on iOS with CBUUID.
On Android however, you must provide a full, 128-bit length UUID as specified in RFC4122.
The fix (as @Michael pointed out) is to prepend your 16bit or 32bit short UUID to the base bluetooth UUID. You can use these functions to make this a bit easier.
public static final String baseBluetoothUuidPostfix = "0000-1000-8000-00805F9B34FB";
public static UUID uuidFromShortCode16(String shortCode16) {
return UUID.fromString("0000" + shortCode16 + "-" + baseBluetoothUuidPostfix);
}
public static UUID uuidFromShortCode32(String shortCode32) {
return UUID.fromString(shortCode32 + "-" + baseBluetoothUuidPostfix);
}
For example:
UUID uuid = uuidFromShortCode16("FFF0");
This creates a UUID object from "0000FFF0-0000-1000-8000-00805F9B34FB"
.
Hope this will help
The exception is due to invalid argument in UUID.fromString()
method.
The UUID.fromString()
method expect "302a5a70-c085-4946-b702-fc1deb1046af"
type of string as its argument and returns instance of UUID
class.
To Convert short hand 16-bit uuid to 128 bit uuid you can use this template "0000XXXX-0000-1000-8000-00805F9B34FB"
. here replace XXXX
with your 16 bit uuid.
For example:
In your case use 128 bit UUID will be "00002415-0000-1000-8000-00805F9B34FB"
.
and to get UUID from string you should use code like this
UUID uuid = UUID.fromString("00002415-0000-1000-8000-00805F9B34FB");
https://newcircle.com/s/post/1786/2016/01/04/bluetooth-uuids-and-interoperable-advertisements
I have a feeling that your String "2415" might just have been straight-up converted from a long, because, as the others point out, "2415" is not close to resembling a UUID. If that is the case, then you should use the UUID constructor which takes two longs:
uuid = new UUID(long mostSignificant, long leastSignificant)
where you can retrieve those long values via
uuid.getMostSignificantBits()
uuid.getLeastSignificantBits()
So in your case, you might do something like uuid = new UUID(2415,2415)