get join-game logic working

backend/test-client.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+# UDP test client with interactive key controls
+# Connects to game server and displays responses
+
+HOST="localhost"
+SERVER_PORT=9999
+LISTEN_PORT=12345
+
+echo "=========================================="
+echo "  Game Test Client"
+echo "=========================================="
+echo ""
+echo "Controls:"
+echo "  1 = REGISTER (join game)"
+echo "  2 = Send position update (100, 200)"
+echo "  3 = Send position update (300, 150)"
+echo "  q = quit"
+echo ""
+echo "Listening for server responses on port $LISTEN_PORT..."
+echo "=========================================="
+echo ""
+
+# Create named pipe for responses
+RESPONSE_PIPE=$(mktemp -d)/response
+mkfifo "$RESPONSE_PIPE"
+
+# Start UDP listener in background, output to FIFO
+nc -u -l 127.0.0.1 $LISTEN_PORT > "$RESPONSE_PIPE" 2>/dev/null &
+LISTENER_PID=$!
+
+# Read responses in background and display them
+(while IFS= read -r line; do
+  echo "[SERVER] $line"
+done < "$RESPONSE_PIPE") &
+READER_PID=$!
+
+# Cleanup on exit
+cleanup() {
+  kill $LISTENER_PID $READER_PID 2>/dev/null
+  rm -rf "$(dirname "$RESPONSE_PIPE")"
+  echo ""
+  echo "Disconnected."
+}
+trap cleanup EXIT
+
+# Interactive input loop
+echo -n "> "
+while IFS= read -rsn1 key; do
+  case "$key" in
+    1)
+      echo ""
+      echo "[CLIENT] Sending: REGISTER"
+      echo -n "REGISTER" | nc -u -w1 -p $LISTEN_PORT "$HOST" "$SERVER_PORT" 2>/dev/null
+      echo -n "> "
+      ;;
+    2)
+      echo ""
+      echo "[CLIENT] Sending: POS#100#200"
+      echo -n "POS#100#200" | nc -u -w1 -p $LISTEN_PORT "$HOST" "$SERVER_PORT" 2>/dev/null
+      echo -n "> "
+      ;;
+    3)
+      echo ""
+      echo "[CLIENT] Sending: POS#300#150"
+      echo -n "POS#300#150" | nc -u -w1 -p $LISTEN_PORT "$HOST" "$SERVER_PORT" 2>/dev/null
+      echo -n "> "
+      ;;
+    q|Q)
+      echo ""
+      break
+      ;;
+    *)
+      # Don't print anything for invalid keys, just show prompt again
+      ;;
+  esac
+done