implements reinit of IO channels

src/Main/fg_io.cxx

@@ -383,6 +383,12 @@ FGProtocol* FGIO::add_channel(const string& config)
 void
 FGIO::reinit()
 {
+    SG_LOG(SG_IO, SG_INFO, "FGIO::reinit()");
+
+    std::for_each(io_channels.begin(), io_channels.end(), [](FGProtocol* p) {
+        SG_LOG(SG_IO, SG_INFO, "Restarting channel \"" << p->get_name() << "\"");
+        p->reinit();
+    });
 }
 
 // process any IO channel work

src/Network/protocol.cxx

@@ -81,6 +81,11 @@ bool FGProtocol::close() {
     return false;
 }
 
+// dummy reinit routine
+void FGProtocol::reinit()
+{
+    SG_LOG(SG_IO, SG_INFO, "dummy FGProtocol::reinit()");
+}
 
 // standard I/O channel close routine
 bool FGProtocol::gen_message() {

src/Network/protocol.hxx

@@ -65,6 +65,7 @@ public:
     virtual bool open();
     virtual bool process();
     virtual bool close();
+    virtual void reinit();
 
     inline SGProtocolDir get_direction() const { return dir; }
     void set_direction( const string& d );