added RTPConnected()

common/terminalClient.go

@@ -274,6 +274,12 @@ func (tc *TerminalClient) RTPSend(data []byte) (err error) {
 	}
 	return nil
 }
+func (tc *TerminalClient) RTPConnected() bool {
+	if tc.udpRTP_TX != nil {
+		return true
+	}
+	return false
+}
 
 /*
 groupAddr := common.NewAddressFromSSINumber(103)