feat(webbridge): implement asynchronous WebSocket connection handling

apis/webbridge.lua

@@ -232,28 +232,46 @@ function WebBridge.wsConnect(wsUrl, handlers, opts)
   local receiveTimeout = opts.receiveTimeout or 30
 
   while true do
-    local ok, ws = pcall(http.websocket, wsUrl)
+    -- Use async API to avoid unfiltered os.pullEvent() in http.websocket()
+    local aok, aerr = http.websocketAsync(wsUrl)
+    if not aok then
+      if handlers.onError then handlers.onError(aerr) end
+      os.sleep(reconnectDelay)
+    else
+      -- Wait for websocket_success or websocket_failure (filtered)
+      local ws = nil
+      while true do
+        local event, url, param = os.pullEvent()
+        if event == 'websocket_success' and url == wsUrl then
+          ws = param
+          break
+        elseif event == 'websocket_failure' and url == wsUrl then
+          if handlers.onError then handlers.onError(param) end
+          break
+        end
+      end
 
-    if ok and ws then
+      if ws then
         if handlers.onConnect then
           handlers.onConnect(ws)
         end
 
-      -- Message receive loop
+        -- Event-based message loop — uses os.pullEvent() with awareness
+        -- of websocket_message, websocket_closed, and timer events.
+        -- Unlike ws.receive(), this loop does NOT swallow unrelated events
+        -- because CC:Tweaked's parallel scheduler delivers each event to
+        -- all coroutines whose filter matches (or filter is nil).
+        local keepaliveTimer = os.startTimer(receiveTimeout)
+
         while true do
-        local rok, msg = pcall(ws.receive, receiveTimeout)
+          local event, p1, p2, p3 = os.pullEvent()
 
-        if not rok then
-          -- Connection error
-          break
-        end
+          if event == 'websocket_message' and p1 == wsUrl then
+            -- Reset keepalive timer on each message
+            os.cancelTimer(keepaliveTimer)
+            keepaliveTimer = os.startTimer(receiveTimeout)
 
-        if not msg then
-          -- Timeout — send keepalive ping
-          local pok = pcall(ws.send, textutils.serialiseJSON({ type = 'ping' }))
-          if not pok then break end
-        else
-          local data = textutils.unserialiseJSON(msg)
+            local data = textutils.unserialiseJSON(p2)
             if data then
               if data.type == 'pong' then
                 -- Keepalive response, handled
@@ -261,6 +279,15 @@ function WebBridge.wsConnect(wsUrl, handlers, opts)
                 handlers.onMessage(ws, data)
               end
             end
+
+          elseif event == 'websocket_closed' and p1 == wsUrl then
+            break
+
+          elseif event == 'timer' and p1 == keepaliveTimer then
+            -- No message received within timeout — send keepalive ping
+            local pok = pcall(ws.send, textutils.serialiseJSON({ type = 'ping' }))
+            if not pok then break end
+            keepaliveTimer = os.startTimer(receiveTimeout)
           end
         end
 
@@ -269,14 +296,11 @@ function WebBridge.wsConnect(wsUrl, handlers, opts)
         if handlers.onDisconnect then
           handlers.onDisconnect()
         end
-    else
-      if handlers.onError then
-        handlers.onError(ws) -- ws contains the error string on failure
-      end
       end
 
       os.sleep(reconnectDelay)
     end
+  end
 end
 
 ---------------------------------------------------------------------------