Initial boilerplate scaffold for continuum-proxy

src/uplink/protocol.rs

@@ -0,0 +1,42 @@
+use serde::{Deserialize, Serialize};
+
+/// Messages sent from this gateway up to `continuum-backend`'s `/ws/edge/v1` route.
+#[derive(Debug, Clone, Serialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ClientMessage {
+    Hello {
+        gateway_id: String,
+        farm_id: String,
+        token: String,
+        version: &'static str,
+    },
+    Heartbeat {
+        seq: u64,
+    },
+    Telemetry {
+        printer_id: String,
+        payload: serde_json::Value,
+    },
+    TaskResult {
+        task_id: String,
+        ok: bool,
+        error: Option<String>,
+    },
+}
+
+/// Messages received from `continuum-backend` over the same connection.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ServerMessage {
+    HelloAck {
+        session_id: String,
+    },
+    HeartbeatAck {
+        seq: u64,
+    },
+    Task {
+        task_id: String,
+        kind: String,
+        payload: serde_json::Value,
+    },
+}