diff --git a/Cargo.toml b/Cargo.toml
index fecb0f3..2391b7f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 repository = "https://git.bfpower.io/BFPOWER/physical"
 readme = "README.md"
@@ -76,6 +76,9 @@ version = "0.1.*"
 [workspace.dependencies.embassy-executor]
 version = "0.5.*"
 features = ["defmt", "arch-cortex-m", "integrated-timers", "executor-interrupt", "executor-thread"]
+[workspace.dependencies.embassy-usb]
+version = "0.2.*"
+features = ["defmt"]
 [workspace.dependencies.embassy-stm32]
 version = "0.1.*"
 features = ["defmt", "unstable-pac"]
diff --git a/node/Cargo.toml b/node/Cargo.toml
index 9f2d8ff..c94acde 100644
--- a/node/Cargo.toml
+++ b/node/Cargo.toml
@@ -7,6 +7,10 @@ repository.workspace = true
 readme.workspace = true
 license.workspace = true
 
+[features]
+comms = []
+stm32 = ["embassy-stm32", "physical/stm32"]
+
 [dependencies.physical]
 path = ".."
 [dependencies.embedded-hal]
@@ -17,3 +21,6 @@ workspace = true
 workspace = true
 [dependencies.uom]
 workspace = true
+[dependencies.embassy-stm32]
+workspace = true
+optional = true
diff --git a/node/src/comms.rs b/node/src/comms.rs
new file mode 100644
index 0000000..d08b29b
--- /dev/null
+++ b/node/src/comms.rs
@@ -0,0 +1,17 @@
+pub trait Sender {
+    async fn send(&mut self, msg: &[u8]) -> Result<(), Reset>;
+}
+
+pub trait Receiver {
+    async fn receive(&mut self, buffer: &mut [u8]) -> Result<(), Reset>;
+}
+
+//TODO: Replace with !
+pub struct Never;
+
+/// Communication errors indicates either:
+/// Our connection was already disconnected, in which case we should reset and wait for new connection to made.
+/// or
+/// There was an unexpected, irrecoverable error in communication, in which case we don't want to enter a terminal error
+/// safe mode, because there is no indication the actual control is broken, so all we can really do is reset the connection.
+pub struct Reset;
\ No newline at end of file
diff --git a/node/src/lib.rs b/node/src/lib.rs
index 5439644..409644a 100644
--- a/node/src/lib.rs
+++ b/node/src/lib.rs
@@ -1,3 +1,8 @@
 #![no_std]
 
+#[cfg(feature = "comms")]
+pub mod comms;
+#[cfg(feature = "stm32")]
+pub mod stm32;
+
 pub use physical::CriticalError;
\ No newline at end of file
diff --git a/node/src/stm32/mod.rs b/node/src/stm32/mod.rs
new file mode 100644
index 0000000..e69de29