Octet-string as byte iterator

ffi/bindings/c/master_example.c

@@ -136,10 +136,10 @@ void handle_octet_strings(dnp3_header_info_t info, dnp3_octet_string_iterator_t
     dnp3_octet_string_t *value = NULL;
     while (value = dnp3_octet_string_iterator_next(it)) {
         printf("Octet String: %u: Value=", value->index);
-        dnp3_byte_value_t *single_byte = dnp3_byte_iterator_next(value->value);
-        while (single_byte != NULL) {
-            printf("%02X", single_byte->value);
-            single_byte = dnp3_byte_iterator_next(value->value);
+        uint8_t *byte = dnp3_byte_iterator_next(value->value);
+        while (byte != NULL) {
+            printf("%02X", *byte);
+            byte = dnp3_byte_iterator_next(value->value);
         }
 
         printf("\n");

ffi/bindings/c/master_example.cpp

@@ -83,7 +83,7 @@ class ReadHandler : public dnp3::ReadHandler {
                 if (!first) {
                     std::cout << ",";
                 }
-                write_hex_byte(std::cout, byte.value);
+                write_hex_byte(std::cout, byte);
                 first = false;
             }
             std::cout << "]" << std::endl;

ffi/bindings/c/master_tls_example.c

@@ -136,10 +136,10 @@ void handle_octet_strings(dnp3_header_info_t info, dnp3_octet_string_iterator_t*
     dnp3_octet_string_t* value = NULL;
     while (value = dnp3_octet_string_iterator_next(it)) {
         printf("Octet String: %u: Value=", value->index);
-        dnp3_byte_value_t* single_byte = dnp3_byte_iterator_next(value->value);
-        while (single_byte != NULL) {
-            printf("%02X", single_byte->value);
-            single_byte = dnp3_byte_iterator_next(value->value);
+        uint8_t* byte = dnp3_byte_iterator_next(value->value);
+        while (byte != NULL) {
+            printf("%02X", *byte);
+            byte = dnp3_byte_iterator_next(value->value);
         }
 
         printf("\n");

ffi/bindings/dotnet/examples/master/Program.cs

@@ -131,7 +131,7 @@ public void HandleOctetString(HeaderInfo info, ICollection<OctetString> values)
                 Console.Write($"Octet String {val.Index}: Value=");
                 foreach (var b in val.Value)
                 {
-                    Console.Write($"{b.Value:X2} ");
+                    Console.Write($"{b:X2} ");
                 }
                 Console.WriteLine();
             }

ffi/bindings/dotnet/examples/master_tls/Program.cs

@@ -131,7 +131,7 @@ public void HandleOctetString(HeaderInfo info, ICollection<OctetString> values)
                 Console.Write($"Octet String {val.Index}: Value=");
                 foreach (var b in val.Value)
                 {
-                    Console.Write($"{b.Value:X2} ");
+                    Console.Write($"{b:X2} ");
                 }
                 Console.WriteLine();
             }

ffi/bindings/java/examples/src/main/java/io/stepfunc/dnp3/examples/MasterExample.java

@@ -211,7 +211,7 @@ public void handleOctetString(HeaderInfo info, List<OctetString> it) {
         val -> {
           System.out.print("Octet String " + val.index + ": Value=");
           val.value.forEach(
-              b -> System.out.print(String.format("%02X", b.value.byteValue()) + " "));
+              b -> System.out.print(String.format("%02X", b.byteValue()) + " "));
           System.out.println();
         });
   }

ffi/dnp3-ffi/src/handler.rs

@@ -373,7 +373,7 @@ impl<'a> ffi::OctetString<'a> {
 
 pub struct ByteIterator<'a> {
     inner: std::slice::Iter<'a, u8>,
-    next: Option<ffi::ByteValue>,
+    next: Option<u8>,
 }
 
 impl<'a> ByteIterator<'a> {
@@ -385,21 +385,21 @@ impl<'a> ByteIterator<'a> {
     }
 
     fn next(&mut self) {
-        self.next = self.inner.next().map(|value| ffi::ByteValue::new(*value))
+        self.next = self.inner.next().copied()
     }
 }
 
-pub unsafe fn byte_iterator_next(it: *mut ByteIterator) -> Option<&ffi::ByteValue> {
+pub unsafe fn byte_iterator_next(it: *mut ByteIterator) -> *const u8 {
     let it = it.as_mut();
-    it.and_then(|it| {
-        it.next();
-        it.next.as_ref()
-    })
-}
-
-impl ffi::ByteValue {
-    fn new(value: u8) -> Self {
-        Self { value }
+    match it {
+        None => std::ptr::null(),
+        Some(x) => {
+            x.next();
+            match &x.next {
+                None => std::ptr::null(),
+                Some(x) => x,
+            }
+        }
     }
 }
 

ffi/dnp3-schema/src/shared.rs

@@ -535,16 +535,7 @@ fn build_iterator<T: Into<UniversalStructField>>(
 fn build_octet_string(
     lib: &mut LibraryBuilder,
 ) -> Result<(FunctionReturnStructHandle, AbstractIteratorHandle), BindingError> {
-    // Octet string stuff
-    let byte_struct_decl = lib.declare_function_return_struct("byte_value")?;
-    let byte_struct = lib
-        .define_function_return_struct(byte_struct_decl)?
-        .add("value", Primitive::U8, "Byte value")?
-        .doc("Single byte struct")?
-        .end_fields()?
-        .build()?;
-
-    let byte_it = lib.define_iterator_with_lifetime("byte_iterator", byte_struct)?;
+    let byte_it = lib.define_iterator_with_lifetime("byte_iterator", Primitive::U8)?;
 
     let octet_string_struct_decl = lib.declare_function_return_struct("octet_string")?;
     let octet_string_struct = lib