chore: release v0.21.3

internal/tunergenius/tunergenius.go

@@ -34,8 +34,7 @@ const (
 	// Poll fast so the meters track TX like the amplifier does (the amp's numbers
 	// ride the real-time Flex UDP stream; the tuner is a synchronous TCP poll, so
 	// a slow interval made its SWR/power lag noticeably behind).
-	pollEvery      = 400 * time.Millisecond
-	reconnectDelay = 2 * time.Second
+	pollEvery = 400 * time.Millisecond
 )
 
 // Channel is the live state of one of the tuner's two RF channels (A / B). The
@@ -215,6 +214,17 @@ func (c *Client) Activate(ch int) error {
 func (c *Client) pollLoop() {
 	t := time.NewTicker(pollEvery)
 	defer t.Stop()
+	// Outage bookkeeping. A dropped link used to be entirely silent: the poll just
+	// set Connected=false and retried, so "did the tuner disconnect, or is the
+	// meter simply reading a gap between syllables?" could not be answered from
+	// the log. Now an outage logs once when it starts and once when it ends, with
+	// how long it lasted.
+	//
+	// Once, not every retry: the poll comes round every 400 ms, and a tuner that
+	// is switched off would otherwise bury the log. These are local to the one
+	// goroutine that polls — ensureConnected has no other caller — so they need no
+	// locking.
+	var downSince time.Time
 	for {
 		select {
 		case <-c.stop:
@@ -223,16 +233,28 @@ func (c *Client) pollLoop() {
 			fresh := false
 			if c.needConnect() {
 				if err := c.ensureConnected(); err != nil {
+					if downSince.IsZero() {
+						downSince = time.Now()
+						applog.Printf("tunergenius: link DOWN — cannot reach %s:%d: %v (retrying)", c.host, c.port, err)
+					}
 					c.setStatus(func(s *Status) { s.Connected = false; s.LastError = "dial: " + err.Error() })
 					continue
 				}
 				fresh = true
+				if !downSince.IsZero() {
+					applog.Printf("tunergenius: link RESTORED after %s down", time.Since(downSince).Round(time.Second))
+					downSince = time.Time{}
+				}
 			}
 			// One-shot on a fresh link: learn the hardware variant (3-way vs SO2R).
 			if fresh {
 				_, _ = c.command("info")
 			}
 			if _, err := c.command("status"); err != nil {
+				if downSince.IsZero() {
+					downSince = time.Now()
+					applog.Printf("tunergenius: link DOWN — poll failed: %v", err)
+				}
 				c.dropConn()
 				c.setStatus(func(s *Status) { s.Connected = false; s.LastError = err.Error() })
 			}