Unity-Android-Bluetooth-Low-Energy
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Velorexe
Error on write characteristic
Im getting this error trying to write a characteristic:
2024/02/25 20:57:35.323 12452 12474 Error Unity AndroidJavaException: java.lang.IllegalArgumentException: Invalid UUID string: 000025e1362d-af97-42c1-92e1-41739cc194e6-0000-1000-8000-00805f9b34fb
2024/02/25 20:57:35.323 12452 12474 Error Unity java.lang.IllegalArgumentException: Invalid UUID string: 000025e1362d-af97-42c1-92e1-41739cc194e6-0000-1000-8000-00805f9b34fb
2024/02/25 20:57:35.323 12452 12474 Error Unity at java.util.UUID.fromStringJava8(UUID.java:276)
2024/02/25 20:57:35.323 12452 12474 Error Unity at java.util.UUID.fromString(UUID.java:223)
2024/02/25 20:57:35.323 12452 12474 Error Unity at com.velorexe.unityandroidble.UnityAndroidBLE.writeToGattCharacteristic(UnityAndroidBLE.java:511)
2024/02/25 20:57:35.323 12452 12474 Error Unity at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
2024/02/25 20:57:35.323 12452 12474 Error Unity at com.unity3d.player.UnityPlayer.-$$Nest$mnativeRender(Unknown Source:0)
2024/02/25 20:57:35.323 12452 12474 Error Unity at com.unity3d.player.UnityPlayer$F$a.handleMessage(Unknown Source:122)
2024/02/25 20:57:35.323 12452 12474 Error Unity at android.os.Handler.dispatchMessage(Handler.java:102)
2024/02/25 20:57:35.323 12452 12474 Error Unity at android.os.Looper.loopOnce(Looper.java:230)
2024/02/25 20:57:35.323 12452 12474 Error Unity at android.os.Looper.loop(Looper.java:319)
2024/02/25 20:57:35.323 12452 12474 Error Unity at com.unity3d.player.UnityPlayer$F.run(Unknown Source:24)
2024/02/25 20:57:35.323 12452 12474 Error Unity at UnityEngine.AndroidJNISafe.CheckException () [0x00096] in <c5ca39a6c98646d4a8b61716838ca615>:0
2024/02/25 20:57:35.323 12452 12474 Error Unity at UnityEngine.AndroidJNISafe.
My class:
public class BLEDeviceController : MonoBehaviour
{
private const string ServiceUuid = "25e1362d-af97-42c1-92e1-41739cc194e6";
private const string CharacteristicUuid = "2a7b25d1-cf73-4b3d-bd95-3a44c1646d1c";
//...
private void SendMovementCommand(string command)
{
if (command == _lastCommand &&
Time.time < _nextRepeatedCommandSend)
{
return;
}
_lastCommand = command;
_nextRepeatedCommandSend = Time.time + repeatedCommandThrottling;
var bleCommand = new WriteToCharacteristic(_deviceUuid, ServiceUuid, CharacteristicUuid, command);
BleManager.Instance.QueueCommand(bleCommand);
}
}
What is that base64 data encoding? Why is that being used?
The same error occurs with: var bleCommand = new WriteToCharacteristic(_deviceUuid, ServiceUuid, CharacteristicUuid, Encoding.UTF8.GetBytes(command)); BleManager.Instance.QueueCommand(bleCommand);
Using a custom gatt call:
2024/02/25 21:11:18.325 15248 15272 Warn Unity Queueing Command: WriteToCharacteristic
2024/02/25 21:11:18.326 15248 15272 Warn Unity Calling Command: writeToCustomGattCharacteristic
2024/02/25 21:11:18.326 15248 15272 Info UnityAndroidBLE [102]
2024/02/25 21:11:18.349 15248 15272 Error Unity AndroidJavaException: java.lang.NullPointerException: Attempt to invoke virtual method 'android.bluetooth.BluetoothGattService android.bluetooth.BluetoothGatt.getService(java.util.UUID)' on a null object reference
2024/02/25 21:11:18.349 15248 15272 Error Unity java.lang.NullPointerException: Attempt to invoke virtual method 'android.bluetooth.BluetoothGattService android.bluetooth.BluetoothGatt.getService(java.util.UUID)' on a null object reference
2024/02/25 21:11:18.349 15248 15272 Error Unity at com.velorexe.unityandroidble.UnityAndroidBLE.writeToCustomGattCharacteristic(UnityAndroidBLE.java:529)
2024/02/25 21:11:18.349 15248 15272 Error Unity at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
2024/02/25 21:11:18.349 15248 15272 Error Unity at com.unity3d.player.UnityPlayer.-$$Nest$mnativeRender(Unknown Source:0)
2024/02/25 21:11:18.349 15248 15272 Error Unity at com.unity3d.player.UnityPlayer$F$a.handleMessage(Unknown Source:122)
2024/02/25 21:11:18.349 15248 15272 Error Unity at android.os.Handler.dispatchMessage(Handler.java:102)
2024/02/25 21:11:18.349 15248 15272 Error Unity at android.os.Looper.loopOnce(Looper.java:230)
2024/02/25 21:11:18.349 15248 15272 Error Unity at android.os.Looper.loop(Looper.java:319)
2024/02/25 21:11:18.349 15248 15272 Error Unity at com.unity3d.player.UnityPlayer$F.run(Unknown Source:24)
2024/02/25 21:11:18.349 15248 15272 Error Unity at UnityEngine.AndroidJNISafe.CheckException () [0x00096] in <c5ca39a6c98646d4a8b6171683
Command code:
private void SendMovementCommand(string command)
{
if (command == _lastCommand &&
Time.time < _nextRepeatedCommandSend)
{
return;
}
_lastCommand = command;
_nextRepeatedCommandSend = Time.time + repeatedCommandThrottling;
var bleCommand = new WriteToCharacteristic(_deviceUuid, ServiceUuid, CharacteristicUuid, Base64Encode(command), true);
BleManager.Instance.QueueCommand(bleCommand);
}
private static string Base64Encode(string plainText)
{
var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
return System.Convert.ToBase64String(plainTextBytes);
}
Heya,
Sorry that you're running into issues. I'll answer the questions in your comments piece by piece!
The reason why I picked base64 encoding and decoding for sending and receiving data is because sending byte[] through the Android JNI is pretty hard compared to sending a string.
From what I can see on your latest error it seems to be a problem with finding your device, since it's trying to call the getService method on a null reference. This can happen when the device is not discovered before writing to a Characteristic, is it possible that the DiscoverDevices command has not yet found your device?
Another question, which version of the Unity Android Bluetooth Low Energy plugin are you using?
I think that for this UUID format ("25e1362d-af97-42c1-92e1-41739cc194e6") you should set the last option customGatt to true
var bleCommand = new WriteToCharacteristic(_deviceUuid, ServiceUuid, CharacteristicUuid, command, **true**);
@fairdox in the second code block they shared it details that they're using the customGatt override.
The Java error message mentions that it can't execute the getService method since it's called on a null object, which would mean that the GattServer (aka the device) is either not known or not connected to the Android device.
(lucasmontec fortis here, I used the wrong account before) So, I ended up writing my own library that does the same thing. It's crude but I was able to do everything. I still have to write a command queue on the native side, but I have added support for unitask async on unity. https://gitlab.com/lucasmontec/zuble-unity-ble-library
(lucasmontec fortis here, I used the wrong account before) So, I ended up writing my own library that does the same thing. It's crude but I was able to do everything. I still have to write a command queue on the native side, but I have added support for unitask async on unity. https://gitlab.com/lucasmontec/zuble-unity-ble-library
Have you completed the necessary codes to read the data coming with Serial.print("message")? I want to read the data coming with serial.print() from the HM-10 module through Unity.
(lucasmontec fortis here, I used the wrong account before) So, I ended up writing my own library that does the same thing. It's crude but I was able to do everything. I still have to write a command queue on the native side, but I have added support for unitask async on unity. https://gitlab.com/lucasmontec/zuble-unity-ble-library
Have you completed the necessary codes to read the data coming with Serial.print("message")? I want to read the data coming with serial.print() from the HM-10 module through Unity.
Instead of printing the data through serial, just store it and use a characteristic with Read implemented. It's on your client side code to implement how data is stored, accessed and read, not on the BLE implementation.