Initial

src/enums.rs

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+use enum_stringify::EnumStringify;
+use num_enum::{IntoPrimitive, TryFromPrimitive};
+
+/// Message Identifier used in the communication protocol. This is specified by Viessmann
+/// and UNACKED is rarely to never used.
+#[repr(u8)]
+#[derive(Debug, TryFromPrimitive, IntoPrimitive, Clone, Copy, PartialEq, EnumStringify)]
+pub enum MessageIdentifier {
+    Request = 0x00,
+    Response = 0x01,
+    Unacked = 0x02,
+    CommError = 0x03,
+}
+
+/// Function Code used in the communication protocol. This is specified by Viessmann
+/// and Read and Write are usually used for simpler values, RPC can maybe be used for
+/// more complex things, but this is currently unclear
+#[repr(u8)]
+#[derive(Debug, TryFromPrimitive, IntoPrimitive, Clone, Copy, PartialEq, EnumStringify)]
+pub enum FunctionCode {
+    VirtualREAD = 0x01,
+    VirtualWRITE = 0x02,
+    RemoteProcedureCall = 0x07,
+}
+
+/// Response code used in the communication protocol. This is specified by Viessmann
+#[repr(u8)]
+#[derive(Debug, TryFromPrimitive)]
+pub enum ResponseCode {
+    Ack = 0x06,
+    Nack = 0x15,
+    Enq = 0x05,
+}