Remove unused method

blessed/src/main/java/com/welie/blessed/BluetoothPeripheralManager.java

@@ -740,7 +740,7 @@ private void cancelAllConnectionsWhenBluetoothOff() {
      * Important note: When {@link BluetoothDevice#TRANSPORT_BREDR} is used by the central,
      * only a single read request is issued by the central regardless of MTU size.
      */
-    private byte[] chopValue(final byte[] value, final int offset) {
+    private byte[] chopValue(@Nullable final byte[] value, final int offset) {
         byte[] choppedValue = new byte[0];
 
         if (value == null) return choppedValue;
@@ -751,14 +751,6 @@ private byte[] chopValue(final byte[] value, final int offset) {
         return choppedValue;
     }
 
-    private @NotNull byte[] copyOf(@NotNull final byte[] source, final int offset, final int maxSize) {
-        if (source.length > maxSize) {
-            final int chunkSize = Math.min(source.length - offset, maxSize);
-            return Arrays.copyOfRange(source, offset, offset + chunkSize);
-        }
-        return Arrays.copyOf(source, source.length);
-    }
-
     /**
      * Make a safe copy of a nullable byte array
      *