re-introduce PROTMESSID_OPUS_SUPPORTED message to support older client versions

src/channel.cpp

@@ -350,6 +350,7 @@ void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTranspor
         if ( ( NetworkTransportProps.eAudioCodingType != CT_OPUS ) &&
              ( NetworkTransportProps.eAudioCodingType != CT_OPUS64 ) )
         {
+            Protocol.CreateOpusSupportedMes();
             return;
         }
 

src/protocol.cpp

@@ -154,6 +154,12 @@ MESSAGES (with connection)
     +---------------------+
 
 
+// #### COMPATIBILITY OLD VERSION, TO BE REMOVED ####
+- PROTMESSID_OPUS_SUPPORTED: Informs that OPUS codec is supported
+
+    note: does not have any data -> n = 0
+
+
 CONNECTION LESS MESSAGES
 ------------------------
 
@@ -1222,6 +1228,12 @@ bool CProtocol::EvaluateLicenceRequiredMes ( const CVector<uint8_t>& vecData )
     return false; // no error
 }
 
+void CProtocol::CreateOpusSupportedMes()
+{
+    CreateAndSendMessage ( PROTMESSID_OPUS_SUPPORTED,
+                           CVector<uint8_t> ( 0 ) );
+}
+
 
 // Connection less messages ----------------------------------------------------
 void CProtocol::CreateCLPingMes ( const CHostAddress& InetAddr, const int iMs )

src/protocol.h

@@ -52,7 +52,7 @@
 #define PROTMESSID_REQ_CHANNEL_INFOS          23 // request channel infos for fader tag
 #define PROTMESSID_CONN_CLIENTS_LIST          24 // channel infos for connected clients
 #define PROTMESSID_CHANNEL_INFOS              25 // set channel infos
-#define PROTMESSID_OPUS_SUPPORTED             26 // OLD (not used anymore)
+#define PROTMESSID_OPUS_SUPPORTED             26 // tells that OPUS codec is supported
 #define PROTMESSID_LICENCE_REQUIRED           27 // licence required
 
 // message IDs of connection less messages (CLM)
@@ -101,6 +101,7 @@ public:
     void CreateNetwTranspPropsMes ( const CNetworkTransportProps& NetTrProps );
     void CreateReqNetwTranspPropsMes();
     void CreateLicenceRequiredMes ( const ELicenceType eLicenceType );
+    void CreateOpusSupportedMes();
 
     void CreateCLPingMes               ( const CHostAddress& InetAddr, const int iMs );
     void CreateCLPingWithNumClientsMes ( const CHostAddress& InetAddr,