Update @ws RouteSelectionExpression that did not match Sandbox

changelog.md

@@ -10,6 +10,14 @@
 - Added Node.js 20.x to test matrix
 - Breaking change: removed support for Node.js 14.x (now EOL, and no longer available to created in AWS Lambda)
 
+
+### Fixed
+
+- Potentially breaking fix: resolved mismatch between `RouteSelectionExpression` in deployed Architect apps vs. locally in Sandbox
+  - The `RouteSelectionExpression` is now `$request.body.action`, meaning WebSocket code running locally (but not on AWS) should be updated from `ws.send(JSON.stringify({ message: 'custom-endpoint', ... }))` to  `ws.send(JSON.stringify({ action: 'custom-endpoint', ... }))`
+  - This fixes #768; thanks @mawdesley + @MartinRamm!
+
+
 ---
 
 ## [8.5.2] 2023-08-22

src/visitors/ws/index.js

@@ -16,7 +16,7 @@ module.exports = function visitWebSockets (inventory, template) {
     Properties: {
       Name,
       ProtocolType: 'WEBSOCKET',
-      RouteSelectionExpression: '$request.body.message'
+      RouteSelectionExpression: '$request.body.action'
     }
   }