Initial commit

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/content_types.rs

@@ -0,0 +1,22 @@
+#[derive(Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum ContentType {
+    Invalid = 0,
+    ChangeCipherSpec = 20,
+    Alert = 21,
+    Handshake = 22,
+    ApplicationData = 23,
+}
+
+impl ContentType {
+    pub fn of(num: u8) -> Option<Self> {
+        match num {
+            0 => Some(Self::Invalid),
+            20 => Some(Self::ChangeCipherSpec),
+            21 => Some(Self::Alert),
+            22 => Some(Self::Handshake),
+            23 => Some(Self::ApplicationData),
+            _ => None,
+        }
+    }
+}