diff --git a/networking/firmware_protocol/src/lib.rs b/networking/firmware_protocol/src/lib.rs
index 26d8caf5..504cbdfb 100644
--- a/networking/firmware_protocol/src/lib.rs
+++ b/networking/firmware_protocol/src/lib.rs
@@ -3,7 +3,7 @@
 extern crate alloc;
 
 mod clientbound;
-mod sansio;
+pub mod sansio;
 mod serverbound;
 
 pub use clientbound::*;
diff --git a/networking/firmware_protocol/src/sansio/mod.rs b/networking/firmware_protocol/src/sansio/mod.rs
index d3fae140..c9ab6ebe 100644
--- a/networking/firmware_protocol/src/sansio/mod.rs
+++ b/networking/firmware_protocol/src/sansio/mod.rs
@@ -2,4 +2,48 @@
 //!
 //! sans-io means that it performs no io and can be used in async or non async code.
 
+use crate::{CbPacket, SbPacket};
+
 mod serialization;
+
+// TODO: All of this code operates on deku stuff, can we make it generic?
+
+pub enum ProtocolState {
+	Disconnected(Disconnected),
+	Connected(Connected),
+}
+impl ProtocolState {
+	pub const fn new() -> Self {
+		Self::Disconnected(Disconnected {})
+	}
+	pub fn received_msg(&mut self, m: CbPacket) -> Option<SbPacket> {
+		// We are going to pass ownership of self, by stealing it out of the enum
+		// temporarily, and putting it back in later.
+
+		let mut taken = Self::new();
+		core::mem::swap(self, &mut taken);
+		let (mut taken, packet) = match taken {
+			ProtocolState::Disconnected(s) => s.received_msg(m),
+			ProtocolState::Connected(s) => s.received_msg(m),
+		};
+		core::mem::swap(self, &mut taken);
+		packet
+	}
+}
+
+pub struct Disconnected {}
+impl Disconnected {
+	pub fn received_msg(self, m: CbPacket) -> (ProtocolState, Option<SbPacket>) {
+		todo!()
+	}
+}
+
+pub struct Connected {}
+impl Connected {
+	pub fn received_msg(self, m: CbPacket) -> (ProtocolState, Option<SbPacket>) {
+		todo!()
+	}
+	pub fn send_imu(&mut self, x: f32, y: f32, z: f32, w: f32) -> SbPacket {
+		todo!()
+	}
+}
diff --git a/networking/firmware_protocol/src/sansio/serialization.rs b/networking/firmware_protocol/src/sansio/serialization.rs
index e7109116..cdafc257 100644
--- a/networking/firmware_protocol/src/sansio/serialization.rs
+++ b/networking/firmware_protocol/src/sansio/serialization.rs
@@ -20,6 +20,6 @@ pub trait SerializeExact {
 	/// `f`'s argument.
 	fn serialize_exact<'a, 'b>(
 		&'a mut self,
-		f: impl FnOnce(usize) -> nb::Result<&'b mut [u8], Self::Error>, // TODO: This might not work
-	) -> nb::Result<(), Self::Error>;
+		f: impl FnOnce(usize) -> Result<&'b mut [u8], Self::Error>,
+	) -> Result<(), Self::Error>;
 }