add FSCSelChannel message decoding (not that we need it);

src/common/p25/dfsi/frames/Frames.h

@@ -35,5 +35,6 @@
 #include "common/p25/dfsi/frames/fsc/FSCReportSelModes.h"
 #include "common/p25/dfsi/frames/fsc/FSCDisconnect.h"
 #include "common/p25/dfsi/frames/fsc/FSCHeartbeat.h"
+#include "common/p25/dfsi/frames/fsc/FSCSelChannel.h"
 
 #endif // __DFSI_FRAMES_H__

src/common/p25/dfsi/frames/fsc/FSCMessage.cpp

@@ -86,14 +86,13 @@ std::unique_ptr<FSCMessage> FSCMessage::createMessage(const uint8_t* data)
     case FSCMessageType::FSC_REPORT_SEL_MODES:
         message = new FSCReportSelModes();
         break;
+    case FSCMessageType::FSC_SEL_CHAN:
+        message = new FSCSelChannel();
+        break;
     case FSCMessageType::FSC_DISCONNECT:
         message = new FSCDisconnect();
         break;
 
-    case FSCMessageType::FSC_SEL_CHAN:
-        message = new FSCMessage();
-        break;
-
     default:
         LogError(LOG_P25, "FSCMessage::createMessage(), unknown message value, messageId = $%02X", messageId);
         break;

src/common/p25/dfsi/frames/fsc/FSCSelChannel.cpp

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Digital Voice Modem - Common Library
+ * GPLv2 Open Source. Use is subject to license terms.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ *  Copyright (C) 2025 Bryan Biedenkapp, N2PLL
+ *
+ */
+#include "common/p25/dfsi/frames/fsc/FSCSelChannel.h"
+#include "common/p25/dfsi/DFSIDefines.h"
+#include "common/Utils.h"
+#include "common/Log.h"
+
+#include <cassert>
+#include <cstring>
+
+using namespace p25::dfsi;
+using namespace p25::dfsi::frames;
+using namespace p25::dfsi::frames::fsc;
+
+// ---------------------------------------------------------------------------
+//  Public Class Members
+// ---------------------------------------------------------------------------
+
+/* Initializes a instance of the FSCSelChannel class. */
+
+FSCSelChannel::FSCSelChannel() : FSCMessage(),
+    m_rxChan(1U),
+    m_txChan(1U)
+{
+    m_messageId = FSCMessageType::FSC_SEL_CHAN;
+}
+
+/* Decode a FSC select channel frame. */
+
+bool FSCSelChannel::decode(const uint8_t* data)
+{
+    assert(data != nullptr);
+    FSCMessage::decode(data);
+
+    m_rxChan = data[3U];                                        // Receive Channel
+    m_txChan = data[4U];                                        // Transmit Channel
+
+    return true;
+}
+
+/* Encode a FSC select channel frame. */
+
+void FSCSelChannel::encode(uint8_t* data)
+{
+    assert(data != nullptr);
+    FSCMessage::encode(data);
+
+    data[3U] = m_rxChan;                                        // Receive Channel
+    data[4U] = m_txChan;                                        // Transmit Channel
+}

src/common/p25/dfsi/frames/fsc/FSCSelChannel.h

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Digital Voice Modem - Common Library
+ * GPLv2 Open Source. Use is subject to license terms.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ *  Copyright (C) 2025 Bryan Biedenkapp, N2PLL
+ *
+ */
+/**
+ * @file FSCReportSelModes.h
+ * @ingroup dfsi_fsc_frames
+ * @file FSCReportSelModes.cpp
+ * @ingroup dfsi_fsc_frames
+ */
+#if !defined(__FSC_SEL_CHANNEL_H__)
+#define __FSC_SEL_CHANNEL_H__
+
+#include "Defines.h"
+#include "common/Defines.h"
+#include "common/Log.h"
+#include "common/Utils.h"
+#include "common/p25/dfsi/frames/FrameDefines.h"
+#include "common/p25/dfsi/frames/fsc/FSCMessage.h"
+
+namespace p25
+{
+    namespace dfsi
+    {
+        namespace frames
+        {
+            namespace fsc
+            {
+                // ---------------------------------------------------------------------------
+                //  Class Declaration
+                // ---------------------------------------------------------------------------
+
+                /**
+                 * @brief Implements the FSC Select Channel Message.
+                 * @ingroup dfsi_fsc_frames
+                 */
+                class HOST_SW_API FSCSelChannel : public FSCMessage {
+                public:
+                    static const uint8_t LENGTH = 3U;
+
+                    /**
+                     * @brief Initializes a copy instance of the FSCSelChannel class.
+                     */
+                    FSCSelChannel();
+
+                    /**
+                     * @brief Decode a FSC select channel frame.
+                     * @param[in] data Buffer to containing FSCSelChannel to decode.
+                     */
+                    bool decode(const uint8_t* data) override;
+                    /**
+                     * @brief Encode a FSC select channel frame.
+                     * @param[out] data Buffer to encode a FSCSelChannel.
+                     */
+                    void encode(uint8_t* data) override;
+
+                public:
+                    /**
+                     * @brief Receive Channel Number.
+                     */
+                    __PROPERTY(uint8_t, rxChan, RxChan);
+                    /**
+                     * @brief Transmit Channel Number.
+                     */
+                    __PROPERTY(uint8_t, txChan, TxChan);
+                };
+            } // namespace fsc
+        } // namespace frames
+    } // namespace dfsi
+} // namespace p25
+
+#endif // __FSC_SEL_CHANNEL_H__