chore: release v0.26.2

internal/cat/flex.go

@@ -2163,6 +2163,34 @@ func (f *Flex) startMeters(conn net.Conn) {
 	debugLog.Printf("Flex: meters UDP local=:%d punch→%s", port, raddr)
 	go f.udpReader(uc)
 	go f.udpKeepalive(uc, raddr)
+	go f.udpWatchdog(uc)
+}
+
+// udpWatchdog says so when the meter stream never arrives.
+//
+// The meters come over VITA-49 on a UDP socket the radio sends TO US; the TCP
+// side can be perfectly healthy — handshake, slices, spots, everything — while
+// not one datagram gets through. On Windows that is almost always the firewall
+// refusing inbound UDP for a program it has not been asked about, and the only
+// symptom is meters that stay at zero. Nothing said so: an operator saw a
+// connected radio with dead meters and no reason anywhere.
+//
+// Five seconds is far longer than the stream's own 40 frames a second needs.
+func (f *Flex) udpWatchdog(uc *net.UDPConn) {
+	time.Sleep(5 * time.Second)
+	f.mu.Lock()
+	cur, seen := f.udpConn, f.vitaSeen
+	port := 0
+	if uc.LocalAddr() != nil {
+		port = uc.LocalAddr().(*net.UDPAddr).Port
+	}
+	f.mu.Unlock()
+	if cur != uc || seen > 0 {
+		return // reconnected in the meantime, or the stream is flowing
+	}
+	debugLog.Printf("Flex: NO meter data after 5s — the radio's VITA-49 stream is not reaching UDP port %d. "+
+		"The TCP link is fine, so this is almost always a firewall: allow OpsLog.exe inbound UDP "+
+		"(Windows Defender Firewall → Allow an app), or open port %d for %s", port, port, f.host)
 }
 
 func (f *Flex) udpReader(uc *net.UDPConn) {