diff --git a/satrs-core/src/cfdp/dest.rs b/satrs-core/src/cfdp/dest.rs
new file mode 100644
index 0000000..13e5cbe
--- /dev/null
+++ b/satrs-core/src/cfdp/dest.rs
@@ -0,0 +1,13 @@
+use super::{TransactionStep, State};
+
+pub struct DestinationHandler {
+    step: TransactionStep,
+    state: State
+}
+
+impl DestinationHandler {
+
+    pub fn state_machine() {}
+
+
+}
diff --git a/satrs-core/src/cfdp/mod.rs b/satrs-core/src/cfdp/mod.rs
new file mode 100644
index 0000000..f62bd14
--- /dev/null
+++ b/satrs-core/src/cfdp/mod.rs
@@ -0,0 +1,25 @@
+pub mod dest;
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum TransactionStep {
+    Idle = 0,
+    TransactionStart = 1,
+    ReceivingFileDataPdus = 2,
+    SendingAckPdu = 3,
+    TransferCompletion = 4,
+    SendingFinishedPdu = 5
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum State {
+    Idle = 0,
+    BusyClass1Nacked = 2,
+    BusyClass2Acked = 3,
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn basic_test() {
+    }
+}
diff --git a/satrs-core/src/lib.rs b/satrs-core/src/lib.rs
index 43c8cfb..6484cc8 100644
--- a/satrs-core/src/lib.rs
+++ b/satrs-core/src/lib.rs
@@ -40,6 +40,7 @@ pub mod request;
 pub mod res_code;
 pub mod seq_count;
 pub mod tmtc;
+pub mod cfdp;
 
 pub use spacepackets;