feat(tcp): TCPStreamer DataSources, in-process TCPStreamService, stream multiplexing and TCPStreamJoin

Add TCPStreamer/TCPStreamerClient (TCP transport behind the UDPSServerI/UDPSClientI
seam), an optional single in-process TCPStreamService serving many streams over
worker threads, multiplexed SUBSCRIBE (comma list, stream index in fragmentIdx),
and TCPStreamJoin, which merges several streams into one sample-and-hold stream
paced by a master. StreamHub takes a comma list of streams over one connection.
Includes GTests, E2E scenarios s58-s73 and docs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Source/Components/DataSources/TCPStreamerClient/TCPStreamerClient.h

@@ -0,0 +1,79 @@
+/**
+ * @file TCPStreamerClient.h
+ * @brief Header file for class TCPStreamerClient
+ * @date 05/11/2026
+ * @author Martino Ferrari
+ *
+ * @copyright Copyright 2015 F4E | European Joint Undertaking for ITER and
+ * the Development of Fusion Energy ('Fusion for Energy').
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved
+ * by the European Commission - subsequent versions of the EUPL (the "Licence")
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at: http://ec.europa.eu/idabc/eupl
+ *
+ * @warning Unless required by applicable law or agreed to in writing,
+ * software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the Licence permissions and limitations under the Licence.
+ *
+ * @details This header file contains the declaration of the class
+ * TCPStreamerClient with all of its public, protected and private members.
+ */
+
+#ifndef TCPSTREAMERCLIENT_H_
+#define TCPSTREAMERCLIENT_H_
+
+#include "TCPSClient.h"
+#include "UDPStreamerClient.h"
+
+namespace MARTe {
+
+/**
+ * @brief A DataSource that receives a TCPStreamer (or any TCP UDPS server)
+ * stream and exposes it as input signals.
+ *
+ * @details Same signal handling and CONFIG validation as UDPStreamerClient; the
+ * transport is a TCPSClient that connects, reads framed UDPS packets, and
+ * reconnects automatically when the connection is lost.
+ *
+ * @par Configuration
+ * | Parameter      | Type    | Default   | Description |
+ * |----------------|---------|-----------|-------------|
+ * | ServerAddress  | string  | 127.0.0.1 | Server IPv4 address or host name. |
+ * | Port           | uint16  | 44500     | Server TCP port. |
+ * | SilenceTimeout | float32 | 0         | Seconds without any received byte before reconnecting; 0 disables. |
+ * | ReconnectDelay | float32 | 2         | Seconds between connection attempts. |
+ * | StreamName     | string  | *(absent)* | Stream to subscribe to on a TCPStreamService (omit for a plain TCPStreamer). |
+ * | CPUMask        | uint32  | 0xFFFFFFFF| Receiver thread affinity. |
+ * | StackSize      | uint32  | (default) | Receiver thread stack size. |
+ *
+ * MulticastGroup, DataPort, Interface and KeepAliveInterval are UDP-only and
+ * rejected.
+ */
+class TCPStreamerClient : public UDPStreamerClient {
+public:
+    CLASS_REGISTER_DECLARATION()
+
+    TCPStreamerClient();
+    virtual ~TCPStreamerClient();
+
+    /** Rejects the UDP-only keys, then behaves as UDPStreamerClient::Initialise(). */
+    virtual bool Initialise(StructuredDataI &data);
+
+    /** @return true while connected to the server. */
+    bool IsConnected() const;
+    /** @return connections established so far. */
+    uint32 GetConnectionCount() const;
+    /** @return connections dropped because of a protocol violation. */
+    uint32 GetProtocolErrors() const;
+
+protected:
+    virtual bool InitialiseTransport(StructuredDataI &data);
+
+private:
+    TCPSClient *tcpClient; /**< Alias of the transport owned by UDPStreamerClient. */
+};
+
+} /* namespace MARTe */
+
+#endif /* TCPSTREAMERCLIENT_H_ */