diff --git a/wifi_core/Cargo.toml b/wifi_core/Cargo.toml
index 554be19..0a16bce 100644
--- a/wifi_core/Cargo.toml
+++ b/wifi_core/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+bincode = "1.3.3"
+serde = { version = "1.0.228", default-features = false, features = ["derive"] }
diff --git a/wifi_core/src/lib.rs b/wifi_core/src/lib.rs
index b93cf3f..cf8b330 100644
--- a/wifi_core/src/lib.rs
+++ b/wifi_core/src/lib.rs
@@ -1,14 +1,4 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
+pub mod protocol;
+pub mod types;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub const PROTOCOL_VERSION: u32 = 1;
diff --git a/wifi_core/src/protocol.rs b/wifi_core/src/protocol.rs
new file mode 100644
index 0000000..310a435
--- /dev/null
+++ b/wifi_core/src/protocol.rs
@@ -0,0 +1,21 @@
+use serde::{Deserialize, Serialize};
+
+use crate::types::{NetworkInfo, WifiStatus};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Request {
+    GetStatus,
+    ListNetworks,
+    Enable,
+    Disable,
+    Connect { ssid: String },
+    Disconnect,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Response {
+    Status(WifiStatus),
+    Networks(Vec<NetworkInfo>),
+    Ok,
+    Error(String),
+}
diff --git a/wifi_core/src/types.rs b/wifi_core/src/types.rs
new file mode 100644
index 0000000..3830e51
--- /dev/null
+++ b/wifi_core/src/types.rs
@@ -0,0 +1,16 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct NetworkInfo {
+    pub ssid: String,
+    pub signal: u8,           // 0–100
+    pub secure: bool,
+    pub connected: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct WifiStatus {
+    pub enabled: bool,
+    pub connected_ssid: Option<String>,
+    pub signal: Option<u8>,   // None if disconnected
+}