When not connected, (1) client hops port numbers (2) server stops sending.

src/network/network.h

@@ -91,6 +91,8 @@ namespace Network {
     static const int PORT_RANGE_LOW  = 60001;
     static const int PORT_RANGE_HIGH = 60999;
 
+    static const unsigned int ASSOCIATION_TIMEOUT = 20000; /* ms */
+
     static bool try_bind( int socket, uint32_t addr, int port );
 
     int sock;
@@ -112,6 +114,8 @@ namespace Network {
     uint64_t saved_timestamp_received_at;
     uint64_t expected_receiver_seq;
 
+    uint64_t last_heard, last_association;
+
     bool RTT_hit;
     double SRTT;
     double RTTVAR;
@@ -123,6 +127,8 @@ namespace Network {
 
     Packet new_packet( string &s_payload );
 
+    void reset( void );
+
   public:
     Connection( const char *desired_ip, const char *desired_port ); /* server */
     Connection( const char *key_str, const char *ip, int port ); /* client */