AFG messaging (#210)

* First draft of afg messaging

* AfgReceivedPrevote, AfgReceivedPrecommit and AfgFinalized added to rust backend

* Tidy up

backend/src/node/connector.rs

@@ -141,9 +141,12 @@ impl StreamHandler<ws::Message, ws::ProtocolError> for NodeConnector {
         };
 
         match serde_json::from_slice(&data) {
-            Ok(msg) => self.handle_message(msg, data, ctx),
+            Ok(msg) => {
+                // info!("New node message: {}", std::str::from_utf8(&data).unwrap_or_else(|_| "INVALID UTF8"));
+                self.handle_message(msg, data, ctx)
+            },
             Err(err) => {
-                let data: &[u8] = data.get(..256).unwrap_or_else(|| &data);
+                let data: &[u8] = data.get(..512).unwrap_or_else(|| &data);
                 warn!("Failed to parse node message: {} {}", err, std::str::from_utf8(data).unwrap_or_else(|_| "INVALID UTF8"))
             },
         }