Implemented qt port + e2e

Source/Components/Interfaces/UDPStream/UDPSClient.h

@@ -78,6 +78,14 @@ public:
     /** Maximum number of concurrent in-flight reassembly slots. */
     static const uint32 UDPS_CLIENT_MAX_REASSEMBLY_SLOTS = 4u;
 
+    /** Maximum size (bytes) of a single reassembled packet payload. A UDPS
+     *  update for one source is fragmented into MaxPayloadSize chunks; this is
+     *  the ceiling on the reassembled total, so it bounds the largest multi-
+     *  fragment packet the client can deliver. Sized for large array bursts
+     *  (e.g. 8x10000 float32 ~= 320 KiB) with headroom; stays well within the
+     *  256-fragment span the recvMask[32] tracks at typical chunk sizes. */
+    static const uint32 UDPS_CLIENT_MAX_PACKET_BYTES = 1048576u; // 1 MiB
+
     /** Default silence timeout before reconnect (seconds). */
     static const uint32 UDPS_CLIENT_DEFAULT_SILENCE_TIMEOUT_S = 5u;
 
@@ -140,10 +148,11 @@ private:
         uint16 totalFragments;  ///< Expected fragment count
         uint16 receivedFragments; ///< How many we have so far
         uint8  recvMask[32];    ///< Bitmask: bit f set iff fragment f received
-        uint8  payload[65535];  ///< Assembled payload buffer
+        uint8  payload[UDPS_CLIENT_MAX_PACKET_BYTES]; ///< Assembled payload buffer
         uint64 firstSeenTicks;  ///< For GC (2 s stale detection)
         bool   active;          ///< Slot in use
         uint32 chunkSize;       ///< Payload bytes per fragment (from first fragment)
+        uint32 assembledBytes;  ///< Exact total payload bytes placed so far
     };
 
     // -------------------------------------------------------------------------