Fix poll handling

YSFGateway/YSFGateway.cpp

@@ -292,9 +292,10 @@ int CYSFGateway::run()
 			}
 
 			if (m_ysfNetwork != NULL && m_linkType == LINK_YSF && !m_exclude) {
-				m_ysfNetwork->write(buffer);
+				if (::memcmp(buffer + 0U, "YSFD", 4U) == 0) {
-				if (::memcmp(buffer + 0U, "YSFD", 4U) == 0)
+					m_ysfNetwork->write(buffer);
 					m_inactivityTimer.start();
+				}
 			}
 
 			if (m_fcsNetwork != NULL && m_linkType == LINK_FCS && !m_exclude) {

YSFGateway/YSFNetwork.cpp

@@ -148,9 +148,13 @@ void CYSFNetwork::writeUnlink(unsigned int count)
 void CYSFNetwork::clock(unsigned int ms)
 {
 	unsigned char buffer[BUFFER_LENGTH];
-
 	in_addr address;
 	unsigned int port;
+
+	m_pollTimer.clock(ms);
+	if (m_pollTimer.isRunning() && m_pollTimer.hasExpired())
+		writePoll();
+
 	int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
 	if (length <= 0)
 		return;
@@ -158,10 +162,6 @@ void CYSFNetwork::clock(unsigned int ms)
 	if (m_port == 0U)
 		return;
 
-	m_pollTimer.clock(ms);
-	if (m_pollTimer.isRunning() && m_pollTimer.hasExpired())
-		writePoll();
-
 	if (address.s_addr != m_address.s_addr || port != m_port)
 		return;