Add Starlink status lines for the physical gateway pane (closes #3) (#7)

Detection is a TCP connect to the dish endpoint bound to the physical
interface; once a dish answers, get_status is read every 5s and two
status lines render under the physical pane, red on disconnect or
alert. No dish: nothing drawn, no RPC. Minimal vendored proto bindings
for get_status only. Independent review passed (PR 7 comment 100012).

Model: opus-4-8 (implementation and review); model: claude-fable-5
(merge)

README.md

@@ -67,6 +67,21 @@ Anything outside this matrix — on Linux, only one of the named pair present, o
 no/multiple default routes when neither is present; on macOS, no default route
 or more than one physical default route — exits with a clear error.
 
+## Starlink status
+
+When the non-VPN physical gateway is a Starlink dish, two extra lines appear
+under that pane: dish state, uptime, obstruction and alert count on the first,
+and pop-ping latency and drop rate with downlink/uplink throughput on the
+second. They turn red when the dish is not connected or an alert is active.
+
+Detection is a TCP connect to the dish's fixed local endpoint,
+`192.168.100.1:9200`, made over the physical interface (the same binding the
+latency probes use). The dish sits behind the Starlink router, so this is not a
+gateway-address check. rtnetmon probes once a minute until a dish answers and
+then reads its status every few seconds; when no dish answers, nothing is drawn
+and no status is fetched. The status comes from the dish's local `get_status`
+gRPC call.
+
 ## Installation
 
 ```bash
@@ -107,6 +122,10 @@ rtnetmon/
 │   │   ├── netdetect.go     # selection logic and route parsers (pure)
 │   │   ├── routes_linux.go  # Linux default-route query (build-tagged)
 │   │   └── routes_darwin.go # macOS default-route query (build-tagged)
+│   ├── starlink/       # Starlink dish detection and status
+│   │   ├── starlink.go      # Status, Client interface, pure Render
+│   │   ├── client.go        # real gRPC client (get_status)
+│   │   └── pb/              # generated bindings for the get_status RPC
 │   └── monitor/        # core monitoring functionality
 │       ├── monitor.go       # monitor types, probes, logging
 │       ├── loops.go         # monitoring loops (reachability, loss, TCP)

go.mod

@@ -7,6 +7,8 @@ require (
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/viper v1.18.2
 	golang.org/x/sys v0.29.0
+	google.golang.org/grpc v1.67.1
+	google.golang.org/protobuf v1.36.6
 )
 
 require (
@@ -30,8 +32,10 @@ require (
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.9.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/net v0.28.0 // indirect
 	golang.org/x/term v0.28.0 // indirect
 	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -91,6 +91,8 @@ golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
 golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
+golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -137,6 +139,12 @@ golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
 golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 h1:e7S5W7MGGLaSu8j3YjdezkZ+m1/Nm0uRVRMEMGk26Xs=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
+google.golang.org/grpc v1.67.1 h1:zWnc1Vrcno+lHZCOofnIMvycFcc0QRGIzm9dhnDX68E=
+google.golang.org/grpc v1.67.1/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/cli/root.go

@@ -98,6 +98,11 @@ func runMonitor(cmd *cobra.Command, cfg *config) error {
 
 	mon := monitor.NewMonitor(specs, cfg.LogFile)
 
+	// The non-VPN physical gateway is the last pane: pane B when there are
+	// two, the only pane when there is one. That is where a Starlink dish,
+	// if present upstream, is detected and its status shown.
+	mon.EnableStarlink(specs[len(specs)-1].Name)
+
 	for _, host := range cfg.Hosts {
 		mon.AddReachabilityHost(host)
 	}

internal/monitor/export_test.go

@@ -1,7 +1,52 @@
 package monitor
 
+import (
+	"context"
+
+	"git.eeqj.de/sneak/rtnetmon/internal/starlink"
+)
+
 // Test-only accessors exposing unexported state for white-box assertions.
 
+// SetStarlinkClient injects a Starlink client for iface, bypassing the real
+// gRPC dialer so the loop can be driven with a fake.
+func (m *Monitor) SetStarlinkClient(iface string, c starlink.Client) {
+	for _, st := range m.interfaces {
+		if st.Name == iface {
+			m.slPane = st
+			m.slState = &starlinkState{}
+			m.slClient = c
+
+			return
+		}
+	}
+}
+
+// StarlinkEnabled reports whether a Starlink client is configured.
+func (m *Monitor) StarlinkEnabled() bool { return m.slClient != nil }
+
+// StarlinkPaneName returns the name of the pane the Starlink lines attach
+// to, or "" if none.
+func (m *Monitor) StarlinkPaneName() string {
+	if m.slPane == nil {
+		return ""
+	}
+
+	return m.slPane.Name
+}
+
+// StarlinkProbeStep runs one detection step.
+func (m *Monitor) StarlinkProbeStep(ctx context.Context) { m.starlinkProbe(ctx) }
+
+// StarlinkRefreshStep runs one status-refresh step.
+func (m *Monitor) StarlinkRefreshStep(ctx context.Context) { m.starlinkRefresh(ctx) }
+
+// StarlinkSnapshot returns the current Starlink display state: detected,
+// have-status, and the latest status.
+func (m *Monitor) StarlinkSnapshot() (bool, bool, starlink.Status) {
+	return m.slState.snapshot()
+}
+
 // ReachabilityHosts returns the configured reachability hosts.
 func (m *Monitor) ReachabilityHosts() []string { return m.reachabilityHosts }
 

internal/monitor/monitor.go

@@ -19,6 +19,8 @@ import (
 	"time"
 
 	tcell "github.com/gdamore/tcell/v2"
+
+	"git.eeqj.de/sneak/rtnetmon/internal/starlink"
 )
 
 // Meter glyphs used to render the ASCII loss meter.
@@ -90,6 +92,12 @@ type Monitor struct {
 	// Interfaces to monitor (one or two)
 	interfaces []*InterfaceStatus
 
+	// Starlink status for the physical (non-VPN gateway) pane. All three
+	// are nil unless EnableStarlink was called for a monitored interface.
+	slClient starlink.Client
+	slState  *starlinkState
+	slPane   *InterfaceStatus
+
 	// Logging
 	logFile string
 
@@ -208,6 +216,8 @@ func (m *Monitor) Run(ctx context.Context) error {
 		go m.tcpLoop(ctx, st, tcpHosts)
 	}
 
+	go m.starlinkLoop(ctx)
+
 	m.logf("Starting UI loop")
 	m.uiLoop(ctx)
 	m.logf("UI loop exited, monitor ending")

internal/monitor/starlink.go

@@ -0,0 +1,166 @@
+package monitor
+
+import (
+	"context"
+	"net"
+	"sync"
+	"time"
+
+	tcell "github.com/gdamore/tcell/v2"
+
+	"git.eeqj.de/sneak/rtnetmon/internal/starlink"
+)
+
+// Starlink probe and status cadence: detect once a minute until a dish
+// answers, then refresh the status every few seconds.
+const (
+	starlinkProbePeriod  = time.Minute
+	starlinkStatusPeriod = 5 * time.Second
+)
+
+// starlinkState holds the latest dish status for the physical pane. Nothing
+// is drawn until a dish first answers, so an absent dish adds no lines.
+type starlinkState struct {
+	mu         sync.RWMutex
+	detected   bool
+	haveStatus bool
+	status     starlink.Status
+}
+
+// snapshot returns whether a dish was detected, whether a status has been
+// read, and the latest status, all under the read lock.
+func (s *starlinkState) snapshot() (bool, bool, starlink.Status) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	return s.detected, s.haveStatus, s.status
+}
+
+// EnableStarlink turns on Starlink detection for the named interface, which
+// must be the non-VPN physical gateway pane. It is a no-op if no monitored
+// interface has that name.
+func (m *Monitor) EnableStarlink(iface string) {
+	for _, st := range m.interfaces {
+		if st.Name == iface {
+			m.slPane = st
+			m.slState = &starlinkState{}
+			m.slClient = starlink.NewClient(m.starlinkDialer(iface))
+
+			return
+		}
+	}
+}
+
+// starlinkDialer returns a dialer that binds to iface exactly as the TCP
+// latency probes do, so the dish is reached over the physical interface.
+func (m *Monitor) starlinkDialer(iface string) starlink.DialFunc {
+	return func(ctx context.Context, addr string) (net.Conn, error) {
+		la, err := localAddr(iface)
+		if err != nil {
+			return nil, err
+		}
+
+		d := net.Dialer{LocalAddr: la, Control: bindControl(iface)}
+
+		return d.DialContext(ctx, "tcp", addr)
+	}
+}
+
+// starlinkLoop probes for a dish and refreshes its status until the context
+// is cancelled. It does nothing when Starlink was not enabled.
+func (m *Monitor) starlinkLoop(ctx context.Context) {
+	if m.slClient == nil {
+		return
+	}
+
+	m.logf("Starting Starlink monitoring for %s", m.slPane.Name)
+	m.starlinkProbe(ctx)
+
+	probe := time.NewTicker(starlinkProbePeriod)
+	status := time.NewTicker(starlinkStatusPeriod)
+
+	defer probe.Stop()
+	defer status.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			m.logf("Stopping Starlink monitoring for %s", m.slPane.Name)
+
+			return
+		case <-probe.C:
+			m.starlinkProbe(ctx)
+		case <-status.C:
+			m.starlinkRefresh(ctx)
+		}
+	}
+}
+
+// starlinkProbe detects the dish; once detected it stays detected, and a
+// first status is fetched immediately.
+func (m *Monitor) starlinkProbe(ctx context.Context) {
+	if detected, _, _ := m.slState.snapshot(); detected {
+		return
+	}
+
+	if !m.slClient.Probe(ctx) {
+		return
+	}
+
+	m.slState.mu.Lock()
+	m.slState.detected = true
+	m.slState.mu.Unlock()
+
+	m.notifyUI()
+	m.starlinkRefresh(ctx)
+}
+
+// starlinkRefresh fetches status only once a dish has been detected, so an
+// absent dish produces no status traffic.
+func (m *Monitor) starlinkRefresh(ctx context.Context) {
+	if detected, _, _ := m.slState.snapshot(); !detected {
+		return
+	}
+
+	st, err := m.slClient.Status(ctx)
+	if err != nil {
+		m.logf("Starlink status error: %v", err)
+
+		return
+	}
+
+	m.slState.mu.Lock()
+	m.slState.status = st
+	m.slState.haveStatus = true
+	m.slState.mu.Unlock()
+
+	m.notifyUI()
+}
+
+// drawStarlink draws the two dish status lines under the physical pane. It
+// draws nothing until a dish has answered.
+func (m *Monitor) drawStarlink(scr tcell.Screen, y int) int {
+	detected, haveStatus, st := m.slState.snapshot()
+	if !detected {
+		return y
+	}
+
+	if !haveStatus {
+		Put(scr, colLeft, y, "Starlink: detected, status unavailable", styleBrightRed())
+
+		return y + lineStep
+	}
+
+	line1, line2, alert := starlink.Render(st)
+
+	style := tcell.StyleDefault
+	if alert {
+		style = styleBrightRed()
+	}
+
+	Put(scr, colLeft, y, line1, style)
+	y += lineStep
+	Put(scr, colLeft, y, line2, style)
+
+	return y + lineStep
+}

internal/monitor/starlink_test.go

@@ -0,0 +1,141 @@
+package monitor_test
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"git.eeqj.de/sneak/rtnetmon/internal/monitor"
+	"git.eeqj.de/sneak/rtnetmon/internal/starlink"
+)
+
+// fakeDish is a Starlink client for tests: no dish, no network. It records
+// how often each method is called and returns programmed results.
+type fakeDish struct {
+	mu          sync.Mutex
+	probeOK     bool
+	status      starlink.Status
+	statusErr   error
+	probeCalls  int
+	statusCalls int
+}
+
+func (f *fakeDish) Probe(_ context.Context) bool {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	f.probeCalls++
+
+	return f.probeOK
+}
+
+func (f *fakeDish) Status(_ context.Context) (starlink.Status, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	f.statusCalls++
+
+	return f.status, f.statusErr
+}
+
+func (f *fakeDish) counts() (int, int) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	return f.probeCalls, f.statusCalls
+}
+
+func newTwoPaneMonitor() *monitor.Monitor {
+	return monitor.NewMonitor([]monitor.IfaceSpec{
+		{Name: ifaceTest0, Label: "A"},
+		{Name: ifaceTest1, Label: "B"},
+	}, "")
+}
+
+func TestEnableStarlinkSelectsPane(t *testing.T) {
+	t.Parallel()
+
+	mon := newTwoPaneMonitor()
+	mon.EnableStarlink(ifaceTest1)
+
+	if !mon.StarlinkEnabled() {
+		t.Fatal("StarlinkEnabled = false, want true")
+	}
+
+	if got := mon.StarlinkPaneName(); got != ifaceTest1 {
+		t.Errorf("StarlinkPaneName = %q, want %q", got, ifaceTest1)
+	}
+}
+
+func TestEnableStarlinkUnknownInterface(t *testing.T) {
+	t.Parallel()
+
+	mon := newTwoPaneMonitor()
+	mon.EnableStarlink("does-not-exist")
+
+	if mon.StarlinkEnabled() {
+		t.Error("StarlinkEnabled = true for an unknown interface, want false")
+	}
+}
+
+// TestStarlinkNoDishNoStatus verifies that when no dish answers, no status
+// is ever fetched and nothing is marked detected.
+func TestStarlinkNoDishNoStatus(t *testing.T) {
+	t.Parallel()
+
+	mon := newTwoPaneMonitor()
+	fake := &fakeDish{probeOK: false}
+	mon.SetStarlinkClient(ifaceTest1, fake)
+
+	ctx := context.Background()
+	mon.StarlinkProbeStep(ctx)
+	mon.StarlinkRefreshStep(ctx)
+
+	detected, haveStatus, _ := mon.StarlinkSnapshot()
+	if detected || haveStatus {
+		t.Errorf("detected=%v haveStatus=%v, want both false", detected, haveStatus)
+	}
+
+	if _, status := fake.counts(); status != 0 {
+		t.Errorf("status calls = %d, want 0 (no probing noise)", status)
+	}
+}
+
+// TestStarlinkDetectedFetchesStatus verifies that once a dish answers,
+// detection triggers a status fetch and later refreshes fetch again.
+func TestStarlinkDetectedFetchesStatus(t *testing.T) {
+	t.Parallel()
+
+	mon := newTwoPaneMonitor()
+	want := starlink.Status{
+		State:        "CONNECTED",
+		Uptime:       2 * time.Hour,
+		DownlinkMbps: 100,
+	}
+	fake := &fakeDish{probeOK: true, status: want}
+	mon.SetStarlinkClient(ifaceTest1, fake)
+
+	ctx := context.Background()
+	mon.StarlinkProbeStep(ctx)
+
+	detected, haveStatus, got := mon.StarlinkSnapshot()
+	if !detected || !haveStatus {
+		t.Fatalf("detected=%v haveStatus=%v, want both true", detected, haveStatus)
+	}
+
+	if got != want {
+		t.Errorf("status = %+v, want %+v", got, want)
+	}
+
+	mon.StarlinkRefreshStep(ctx)
+
+	probe, status := fake.counts()
+	if probe != 1 {
+		t.Errorf("probe calls = %d, want 1", probe)
+	}
+
+	if status != 2 {
+		t.Errorf("status calls = %d, want 2", status)
+	}
+}

internal/monitor/ui.go

@@ -107,6 +107,11 @@ func (m *Monitor) DrawInterface(scr tcell.Screen, y, w int, st *InterfaceStatus)
 	y = m.drawTCPTable(scr, y, st, tcpHosts)
 	y = drawICMPStats(scr, y, st)
 
+	// The Starlink lines belong to the physical (non-VPN gateway) pane only.
+	if st == m.slPane {
+		y = m.drawStarlink(scr, y)
+	}
+
 	return y
 }
 

internal/starlink/client.go

@@ -0,0 +1,129 @@
+package starlink
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	pb "git.eeqj.de/sneak/rtnetmon/internal/starlink/pb"
+)
+
+// errNoDishStatus is returned when the dish answers but the response
+// carries no dish status.
+var errNoDishStatus = errors.New("no dish status in response")
+
+// Per-call deadlines so a silent dish never wedges the monitor loop.
+const (
+	probeTimeout  = 2 * time.Second
+	statusTimeout = 3 * time.Second
+)
+
+// DialFunc opens a TCP connection to addr bound to a chosen interface. The
+// monitor supplies one that binds the same way its TCP latency probes do,
+// so the dish is reached over the physical (non-VPN) interface rather than
+// a VPN tunnel that may hold the default route.
+type DialFunc func(ctx context.Context, addr string) (net.Conn, error)
+
+// GRPCClient is the real Client: it reaches a dish at Address over whatever
+// interface dial binds to.
+type GRPCClient struct {
+	dial DialFunc
+}
+
+// NewClient returns a client that talks to a dish at Address, dialing with
+// dial so the connection leaves the intended interface.
+func NewClient(dial DialFunc) *GRPCClient {
+	return &GRPCClient{dial: dial}
+}
+
+// Probe connects to the dish's endpoint and closes it. A successful TCP
+// connect over the bound interface is the detection signal.
+func (c *GRPCClient) Probe(ctx context.Context) bool {
+	ctx, cancel := context.WithTimeout(ctx, probeTimeout)
+	defer cancel()
+
+	conn, err := c.dial(ctx, Address)
+	if err != nil {
+		return false
+	}
+
+	_ = conn.Close()
+
+	return true
+}
+
+// Status calls the dish's get_status RPC and reduces the response to the
+// fields rtnetmon shows.
+func (c *GRPCClient) Status(ctx context.Context) (Status, error) {
+	ctx, cancel := context.WithTimeout(ctx, statusTimeout)
+	defer cancel()
+
+	// passthrough:/// hands Address straight to our dialer, with no name
+	// resolution, so the connection is made over the bound interface.
+	conn, err := grpc.NewClient("passthrough:///"+Address,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
+			return c.dial(ctx, addr)
+		}),
+	)
+	if err != nil {
+		return Status{}, fmt.Errorf("starlink dial: %w", err)
+	}
+	defer func() { _ = conn.Close() }()
+
+	resp, err := pb.NewDeviceClient(conn).Handle(ctx, &pb.Request{
+		Request: &pb.Request_GetStatus{GetStatus: &pb.GetStatusRequest{}},
+	})
+	if err != nil {
+		return Status{}, fmt.Errorf("starlink get_status: %w", err)
+	}
+
+	dish := resp.GetDishGetStatus()
+	if dish == nil {
+		return Status{}, errNoDishStatus
+	}
+
+	return statusFromDish(dish), nil
+}
+
+// statusFromDish reduces the dish's status message to a Status. The
+// generated getters are nil-safe, so absent sub-messages read as zero.
+func statusFromDish(d *pb.DishGetStatusResponse) Status {
+	obstruction := float64(d.GetObstructionStats().GetFractionObstructed())
+	//nolint:gosec // G115: dish uptime in seconds never approaches int64 max
+	uptime := time.Duration(d.GetDeviceState().GetUptimeS()) * time.Second
+
+	return Status{
+		State:          d.GetState().String(),
+		Uptime:         uptime,
+		ObstructionPct: obstruction * percentScale,
+		Alerts:         countAlerts(d.GetAlerts()),
+		PopPingMs:      float64(d.GetPopPingLatencyMs()),
+		PopPingDropPct: float64(d.GetPopPingDropRate()) * percentScale,
+		DownlinkMbps:   float64(d.GetDownlinkThroughputBps()) / bitsPerMegabit,
+		UplinkMbps:     float64(d.GetUplinkThroughputBps()) / bitsPerMegabit,
+	}
+}
+
+// countAlerts counts the active dish alert flags.
+func countAlerts(a *pb.DishAlerts) int {
+	n := 0
+
+	for _, on := range []bool{
+		a.GetMotorsStuck(),
+		a.GetThermalShutdown(),
+		a.GetThermalThrottle(),
+		a.GetUnexpectedLocation(),
+	} {
+		if on {
+			n++
+		}
+	}
+
+	return n
+}

internal/starlink/pb/starlink.pb.go

@@ -0,0 +1,629 @@
+// A minimal slice of the Starlink dish's local gRPC API: just the one
+// unary RPC (SpaceX.API.Device.Device/Handle) and the get_status request
+// and dish status response, reduced to the handful of fields rtnetmon
+// shows. The proto package name and field numbers must match the dish
+// exactly for the wire format to line up; every other field the dish sends
+// is ignored as an unknown field.
+//
+// Field numbers, message names and the DishState enum are transcribed from
+// the community-maintained pre-generated bindings at
+// github.com/starlink-community/starlink-grpc-go, commit
+// 2e89f3d7e3092adecbcc04e9e003e61ed5f7c6a3 (get_status = 1004,
+// dish_get_status = 2004). They are not verified against a live dish here.
+//
+// Regenerate with:
+//   protoc --go_out=. --go_opt=paths=source_relative \
+//          --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+//          internal/starlink/pb/starlink.proto
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.6
+// 	protoc        v7.36.2
+// source: internal/starlink/pb/starlink.proto
+
+package starlinkpb
+
+import (
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type DishState int32
+
+const (
+	DishState_UNKNOWN   DishState = 0
+	DishState_CONNECTED DishState = 1
+	DishState_SEARCHING DishState = 2
+	DishState_BOOTING   DishState = 3
+)
+
+// Enum value maps for DishState.
+var (
+	DishState_name = map[int32]string{
+		0: "UNKNOWN",
+		1: "CONNECTED",
+		2: "SEARCHING",
+		3: "BOOTING",
+	}
+	DishState_value = map[string]int32{
+		"UNKNOWN":   0,
+		"CONNECTED": 1,
+		"SEARCHING": 2,
+		"BOOTING":   3,
+	}
+)
+
+func (x DishState) Enum() *DishState {
+	p := new(DishState)
+	*p = x
+	return p
+}
+
+func (x DishState) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (DishState) Descriptor() protoreflect.EnumDescriptor {
+	return file_internal_starlink_pb_starlink_proto_enumTypes[0].Descriptor()
+}
+
+func (DishState) Type() protoreflect.EnumType {
+	return &file_internal_starlink_pb_starlink_proto_enumTypes[0]
+}
+
+func (x DishState) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use DishState.Descriptor instead.
+func (DishState) EnumDescriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{0}
+}
+
+type Request struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// Types that are valid to be assigned to Request:
+	//
+	//	*Request_GetStatus
+	Request       isRequest_Request `protobuf_oneof:"request"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Request) Reset() {
+	*x = Request{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Request) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Request) ProtoMessage() {}
+
+func (x *Request) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Request.ProtoReflect.Descriptor instead.
+func (*Request) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Request) GetRequest() isRequest_Request {
+	if x != nil {
+		return x.Request
+	}
+	return nil
+}
+
+func (x *Request) GetGetStatus() *GetStatusRequest {
+	if x != nil {
+		if x, ok := x.Request.(*Request_GetStatus); ok {
+			return x.GetStatus
+		}
+	}
+	return nil
+}
+
+type isRequest_Request interface {
+	isRequest_Request()
+}
+
+type Request_GetStatus struct {
+	GetStatus *GetStatusRequest `protobuf:"bytes,1004,opt,name=get_status,json=getStatus,proto3,oneof"`
+}
+
+func (*Request_GetStatus) isRequest_Request() {}
+
+type GetStatusRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetStatusRequest) Reset() {
+	*x = GetStatusRequest{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetStatusRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetStatusRequest) ProtoMessage() {}
+
+func (x *GetStatusRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetStatusRequest.ProtoReflect.Descriptor instead.
+func (*GetStatusRequest) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{1}
+}
+
+type Response struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// Types that are valid to be assigned to Response:
+	//
+	//	*Response_DishGetStatus
+	Response      isResponse_Response `protobuf_oneof:"response"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Response) Reset() {
+	*x = Response{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Response) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Response) ProtoMessage() {}
+
+func (x *Response) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[2]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Response.ProtoReflect.Descriptor instead.
+func (*Response) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *Response) GetResponse() isResponse_Response {
+	if x != nil {
+		return x.Response
+	}
+	return nil
+}
+
+func (x *Response) GetDishGetStatus() *DishGetStatusResponse {
+	if x != nil {
+		if x, ok := x.Response.(*Response_DishGetStatus); ok {
+			return x.DishGetStatus
+		}
+	}
+	return nil
+}
+
+type isResponse_Response interface {
+	isResponse_Response()
+}
+
+type Response_DishGetStatus struct {
+	DishGetStatus *DishGetStatusResponse `protobuf:"bytes,2004,opt,name=dish_get_status,json=dishGetStatus,proto3,oneof"`
+}
+
+func (*Response_DishGetStatus) isResponse_Response() {}
+
+type DishGetStatusResponse struct {
+	state                 protoimpl.MessageState `protogen:"open.v1"`
+	DeviceState           *DeviceState           `protobuf:"bytes,2,opt,name=device_state,json=deviceState,proto3" json:"device_state,omitempty"`
+	ObstructionStats      *DishObstructionStats  `protobuf:"bytes,1004,opt,name=obstruction_stats,json=obstructionStats,proto3" json:"obstruction_stats,omitempty"`
+	Alerts                *DishAlerts            `protobuf:"bytes,1005,opt,name=alerts,proto3" json:"alerts,omitempty"`
+	State                 DishState              `protobuf:"varint,1006,opt,name=state,proto3,enum=SpaceX.API.Device.DishState" json:"state,omitempty"`
+	PopPingDropRate       float32                `protobuf:"fixed32,1003,opt,name=pop_ping_drop_rate,json=popPingDropRate,proto3" json:"pop_ping_drop_rate,omitempty"`
+	DownlinkThroughputBps float32                `protobuf:"fixed32,1007,opt,name=downlink_throughput_bps,json=downlinkThroughputBps,proto3" json:"downlink_throughput_bps,omitempty"`
+	UplinkThroughputBps   float32                `protobuf:"fixed32,1008,opt,name=uplink_throughput_bps,json=uplinkThroughputBps,proto3" json:"uplink_throughput_bps,omitempty"`
+	PopPingLatencyMs      float32                `protobuf:"fixed32,1009,opt,name=pop_ping_latency_ms,json=popPingLatencyMs,proto3" json:"pop_ping_latency_ms,omitempty"`
+	unknownFields         protoimpl.UnknownFields
+	sizeCache             protoimpl.SizeCache
+}
+
+func (x *DishGetStatusResponse) Reset() {
+	*x = DishGetStatusResponse{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DishGetStatusResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DishGetStatusResponse) ProtoMessage() {}
+
+func (x *DishGetStatusResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[3]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DishGetStatusResponse.ProtoReflect.Descriptor instead.
+func (*DishGetStatusResponse) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *DishGetStatusResponse) GetDeviceState() *DeviceState {
+	if x != nil {
+		return x.DeviceState
+	}
+	return nil
+}
+
+func (x *DishGetStatusResponse) GetObstructionStats() *DishObstructionStats {
+	if x != nil {
+		return x.ObstructionStats
+	}
+	return nil
+}
+
+func (x *DishGetStatusResponse) GetAlerts() *DishAlerts {
+	if x != nil {
+		return x.Alerts
+	}
+	return nil
+}
+
+func (x *DishGetStatusResponse) GetState() DishState {
+	if x != nil {
+		return x.State
+	}
+	return DishState_UNKNOWN
+}
+
+func (x *DishGetStatusResponse) GetPopPingDropRate() float32 {
+	if x != nil {
+		return x.PopPingDropRate
+	}
+	return 0
+}
+
+func (x *DishGetStatusResponse) GetDownlinkThroughputBps() float32 {
+	if x != nil {
+		return x.DownlinkThroughputBps
+	}
+	return 0
+}
+
+func (x *DishGetStatusResponse) GetUplinkThroughputBps() float32 {
+	if x != nil {
+		return x.UplinkThroughputBps
+	}
+	return 0
+}
+
+func (x *DishGetStatusResponse) GetPopPingLatencyMs() float32 {
+	if x != nil {
+		return x.PopPingLatencyMs
+	}
+	return 0
+}
+
+type DeviceState struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UptimeS       uint64                 `protobuf:"varint,1,opt,name=uptime_s,json=uptimeS,proto3" json:"uptime_s,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *DeviceState) Reset() {
+	*x = DeviceState{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DeviceState) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DeviceState) ProtoMessage() {}
+
+func (x *DeviceState) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[4]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DeviceState.ProtoReflect.Descriptor instead.
+func (*DeviceState) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *DeviceState) GetUptimeS() uint64 {
+	if x != nil {
+		return x.UptimeS
+	}
+	return 0
+}
+
+type DishObstructionStats struct {
+	state              protoimpl.MessageState `protogen:"open.v1"`
+	FractionObstructed float32                `protobuf:"fixed32,1,opt,name=fraction_obstructed,json=fractionObstructed,proto3" json:"fraction_obstructed,omitempty"`
+	unknownFields      protoimpl.UnknownFields
+	sizeCache          protoimpl.SizeCache
+}
+
+func (x *DishObstructionStats) Reset() {
+	*x = DishObstructionStats{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DishObstructionStats) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DishObstructionStats) ProtoMessage() {}
+
+func (x *DishObstructionStats) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[5]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DishObstructionStats.ProtoReflect.Descriptor instead.
+func (*DishObstructionStats) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *DishObstructionStats) GetFractionObstructed() float32 {
+	if x != nil {
+		return x.FractionObstructed
+	}
+	return 0
+}
+
+type DishAlerts struct {
+	state              protoimpl.MessageState `protogen:"open.v1"`
+	MotorsStuck        bool                   `protobuf:"varint,1,opt,name=motors_stuck,json=motorsStuck,proto3" json:"motors_stuck,omitempty"`
+	ThermalShutdown    bool                   `protobuf:"varint,2,opt,name=thermal_shutdown,json=thermalShutdown,proto3" json:"thermal_shutdown,omitempty"`
+	ThermalThrottle    bool                   `protobuf:"varint,3,opt,name=thermal_throttle,json=thermalThrottle,proto3" json:"thermal_throttle,omitempty"`
+	UnexpectedLocation bool                   `protobuf:"varint,4,opt,name=unexpected_location,json=unexpectedLocation,proto3" json:"unexpected_location,omitempty"`
+	unknownFields      protoimpl.UnknownFields
+	sizeCache          protoimpl.SizeCache
+}
+
+func (x *DishAlerts) Reset() {
+	*x = DishAlerts{}
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DishAlerts) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DishAlerts) ProtoMessage() {}
+
+func (x *DishAlerts) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_starlink_pb_starlink_proto_msgTypes[6]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DishAlerts.ProtoReflect.Descriptor instead.
+func (*DishAlerts) Descriptor() ([]byte, []int) {
+	return file_internal_starlink_pb_starlink_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *DishAlerts) GetMotorsStuck() bool {
+	if x != nil {
+		return x.MotorsStuck
+	}
+	return false
+}
+
+func (x *DishAlerts) GetThermalShutdown() bool {
+	if x != nil {
+		return x.ThermalShutdown
+	}
+	return false
+}
+
+func (x *DishAlerts) GetThermalThrottle() bool {
+	if x != nil {
+		return x.ThermalThrottle
+	}
+	return false
+}
+
+func (x *DishAlerts) GetUnexpectedLocation() bool {
+	if x != nil {
+		return x.UnexpectedLocation
+	}
+	return false
+}
+
+var File_internal_starlink_pb_starlink_proto protoreflect.FileDescriptor
+
+const file_internal_starlink_pb_starlink_proto_rawDesc = "" +
+	"\n" +
+	"#internal/starlink/pb/starlink.proto\x12\x11SpaceX.API.Device\"[\n" +
+	"\aRequest\x12E\n" +
+	"\n" +
+	"get_status\x18\xec\a \x01(\v2#.SpaceX.API.Device.GetStatusRequestH\x00R\tgetStatusB\t\n" +
+	"\arequest\"\x12\n" +
+	"\x10GetStatusRequest\"k\n" +
+	"\bResponse\x12S\n" +
+	"\x0fdish_get_status\x18\xd4\x0f \x01(\v2(.SpaceX.API.Device.DishGetStatusResponseH\x00R\rdishGetStatusB\n" +
+	"\n" +
+	"\bresponse\"\xea\x03\n" +
+	"\x15DishGetStatusResponse\x12A\n" +
+	"\fdevice_state\x18\x02 \x01(\v2\x1e.SpaceX.API.Device.DeviceStateR\vdeviceState\x12U\n" +
+	"\x11obstruction_stats\x18\xec\a \x01(\v2'.SpaceX.API.Device.DishObstructionStatsR\x10obstructionStats\x126\n" +
+	"\x06alerts\x18\xed\a \x01(\v2\x1d.SpaceX.API.Device.DishAlertsR\x06alerts\x123\n" +
+	"\x05state\x18\xee\a \x01(\x0e2\x1c.SpaceX.API.Device.DishStateR\x05state\x12,\n" +
+	"\x12pop_ping_drop_rate\x18\xeb\a \x01(\x02R\x0fpopPingDropRate\x127\n" +
+	"\x17downlink_throughput_bps\x18\xef\a \x01(\x02R\x15downlinkThroughputBps\x123\n" +
+	"\x15uplink_throughput_bps\x18\xf0\a \x01(\x02R\x13uplinkThroughputBps\x12.\n" +
+	"\x13pop_ping_latency_ms\x18\xf1\a \x01(\x02R\x10popPingLatencyMs\"(\n" +
+	"\vDeviceState\x12\x19\n" +
+	"\buptime_s\x18\x01 \x01(\x04R\auptimeS\"G\n" +
+	"\x14DishObstructionStats\x12/\n" +
+	"\x13fraction_obstructed\x18\x01 \x01(\x02R\x12fractionObstructed\"\xb6\x01\n" +
+	"\n" +
+	"DishAlerts\x12!\n" +
+	"\fmotors_stuck\x18\x01 \x01(\bR\vmotorsStuck\x12)\n" +
+	"\x10thermal_shutdown\x18\x02 \x01(\bR\x0fthermalShutdown\x12)\n" +
+	"\x10thermal_throttle\x18\x03 \x01(\bR\x0fthermalThrottle\x12/\n" +
+	"\x13unexpected_location\x18\x04 \x01(\bR\x12unexpectedLocation*C\n" +
+	"\tDishState\x12\v\n" +
+	"\aUNKNOWN\x10\x00\x12\r\n" +
+	"\tCONNECTED\x10\x01\x12\r\n" +
+	"\tSEARCHING\x10\x02\x12\v\n" +
+	"\aBOOTING\x10\x032K\n" +
+	"\x06Device\x12A\n" +
+	"\x06Handle\x12\x1a.SpaceX.API.Device.Request\x1a\x1b.SpaceX.API.Device.ResponseB<Z:git.eeqj.de/sneak/rtnetmon/internal/starlink/pb;starlinkpbb\x06proto3"
+
+var (
+	file_internal_starlink_pb_starlink_proto_rawDescOnce sync.Once
+	file_internal_starlink_pb_starlink_proto_rawDescData []byte
+)
+
+func file_internal_starlink_pb_starlink_proto_rawDescGZIP() []byte {
+	file_internal_starlink_pb_starlink_proto_rawDescOnce.Do(func() {
+		file_internal_starlink_pb_starlink_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_internal_starlink_pb_starlink_proto_rawDesc), len(file_internal_starlink_pb_starlink_proto_rawDesc)))
+	})
+	return file_internal_starlink_pb_starlink_proto_rawDescData
+}
+
+var file_internal_starlink_pb_starlink_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_internal_starlink_pb_starlink_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
+var file_internal_starlink_pb_starlink_proto_goTypes = []any{
+	(DishState)(0),                // 0: SpaceX.API.Device.DishState
+	(*Request)(nil),               // 1: SpaceX.API.Device.Request
+	(*GetStatusRequest)(nil),      // 2: SpaceX.API.Device.GetStatusRequest
+	(*Response)(nil),              // 3: SpaceX.API.Device.Response
+	(*DishGetStatusResponse)(nil), // 4: SpaceX.API.Device.DishGetStatusResponse
+	(*DeviceState)(nil),           // 5: SpaceX.API.Device.DeviceState
+	(*DishObstructionStats)(nil),  // 6: SpaceX.API.Device.DishObstructionStats
+	(*DishAlerts)(nil),            // 7: SpaceX.API.Device.DishAlerts
+}
+var file_internal_starlink_pb_starlink_proto_depIdxs = []int32{
+	2, // 0: SpaceX.API.Device.Request.get_status:type_name -> SpaceX.API.Device.GetStatusRequest
+	4, // 1: SpaceX.API.Device.Response.dish_get_status:type_name -> SpaceX.API.Device.DishGetStatusResponse
+	5, // 2: SpaceX.API.Device.DishGetStatusResponse.device_state:type_name -> SpaceX.API.Device.DeviceState
+	6, // 3: SpaceX.API.Device.DishGetStatusResponse.obstruction_stats:type_name -> SpaceX.API.Device.DishObstructionStats
+	7, // 4: SpaceX.API.Device.DishGetStatusResponse.alerts:type_name -> SpaceX.API.Device.DishAlerts
+	0, // 5: SpaceX.API.Device.DishGetStatusResponse.state:type_name -> SpaceX.API.Device.DishState
+	1, // 6: SpaceX.API.Device.Device.Handle:input_type -> SpaceX.API.Device.Request
+	3, // 7: SpaceX.API.Device.Device.Handle:output_type -> SpaceX.API.Device.Response
+	7, // [7:8] is the sub-list for method output_type
+	6, // [6:7] is the sub-list for method input_type
+	6, // [6:6] is the sub-list for extension type_name
+	6, // [6:6] is the sub-list for extension extendee
+	0, // [0:6] is the sub-list for field type_name
+}
+
+func init() { file_internal_starlink_pb_starlink_proto_init() }
+func file_internal_starlink_pb_starlink_proto_init() {
+	if File_internal_starlink_pb_starlink_proto != nil {
+		return
+	}
+	file_internal_starlink_pb_starlink_proto_msgTypes[0].OneofWrappers = []any{
+		(*Request_GetStatus)(nil),
+	}
+	file_internal_starlink_pb_starlink_proto_msgTypes[2].OneofWrappers = []any{
+		(*Response_DishGetStatus)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_internal_starlink_pb_starlink_proto_rawDesc), len(file_internal_starlink_pb_starlink_proto_rawDesc)),
+			NumEnums:      1,
+			NumMessages:   7,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_internal_starlink_pb_starlink_proto_goTypes,
+		DependencyIndexes: file_internal_starlink_pb_starlink_proto_depIdxs,
+		EnumInfos:         file_internal_starlink_pb_starlink_proto_enumTypes,
+		MessageInfos:      file_internal_starlink_pb_starlink_proto_msgTypes,
+	}.Build()
+	File_internal_starlink_pb_starlink_proto = out.File
+	file_internal_starlink_pb_starlink_proto_goTypes = nil
+	file_internal_starlink_pb_starlink_proto_depIdxs = nil
+}

internal/starlink/pb/starlink.proto

@@ -0,0 +1,74 @@
+// A minimal slice of the Starlink dish's local gRPC API: just the one
+// unary RPC (SpaceX.API.Device.Device/Handle) and the get_status request
+// and dish status response, reduced to the handful of fields rtnetmon
+// shows. The proto package name and field numbers must match the dish
+// exactly for the wire format to line up; every other field the dish sends
+// is ignored as an unknown field.
+//
+// Field numbers, message names and the DishState enum are transcribed from
+// the community-maintained pre-generated bindings at
+// github.com/starlink-community/starlink-grpc-go, commit
+// 2e89f3d7e3092adecbcc04e9e003e61ed5f7c6a3 (get_status = 1004,
+// dish_get_status = 2004). They are not verified against a live dish here.
+//
+// Regenerate with:
+//   protoc --go_out=. --go_opt=paths=source_relative \
+//          --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+//          internal/starlink/pb/starlink.proto
+
+syntax = "proto3";
+
+package SpaceX.API.Device;
+
+option go_package = "git.eeqj.de/sneak/rtnetmon/internal/starlink/pb;starlinkpb";
+
+service Device {
+  rpc Handle(Request) returns (Response);
+}
+
+message Request {
+  oneof request {
+    GetStatusRequest get_status = 1004;
+  }
+}
+
+message GetStatusRequest {}
+
+message Response {
+  oneof response {
+    DishGetStatusResponse dish_get_status = 2004;
+  }
+}
+
+message DishGetStatusResponse {
+  DeviceState device_state = 2;
+  DishObstructionStats obstruction_stats = 1004;
+  DishAlerts alerts = 1005;
+  DishState state = 1006;
+  float pop_ping_drop_rate = 1003;
+  float downlink_throughput_bps = 1007;
+  float uplink_throughput_bps = 1008;
+  float pop_ping_latency_ms = 1009;
+}
+
+message DeviceState {
+  uint64 uptime_s = 1;
+}
+
+message DishObstructionStats {
+  float fraction_obstructed = 1;
+}
+
+message DishAlerts {
+  bool motors_stuck = 1;
+  bool thermal_shutdown = 2;
+  bool thermal_throttle = 3;
+  bool unexpected_location = 4;
+}
+
+enum DishState {
+  UNKNOWN = 0;
+  CONNECTED = 1;
+  SEARCHING = 2;
+  BOOTING = 3;
+}

internal/starlink/pb/starlink_grpc.pb.go

@@ -0,0 +1,140 @@
+// A minimal slice of the Starlink dish's local gRPC API: just the one
+// unary RPC (SpaceX.API.Device.Device/Handle) and the get_status request
+// and dish status response, reduced to the handful of fields rtnetmon
+// shows. The proto package name and field numbers must match the dish
+// exactly for the wire format to line up; every other field the dish sends
+// is ignored as an unknown field.
+//
+// Field numbers, message names and the DishState enum are transcribed from
+// the community-maintained pre-generated bindings at
+// github.com/starlink-community/starlink-grpc-go, commit
+// 2e89f3d7e3092adecbcc04e9e003e61ed5f7c6a3 (get_status = 1004,
+// dish_get_status = 2004). They are not verified against a live dish here.
+//
+// Regenerate with:
+//   protoc --go_out=. --go_opt=paths=source_relative \
+//          --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+//          internal/starlink/pb/starlink.proto
+
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v7.36.2
+// source: internal/starlink/pb/starlink.proto
+
+package starlinkpb
+
+import (
+	context "context"
+
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	Device_Handle_FullMethodName = "/SpaceX.API.Device.Device/Handle"
+)
+
+// DeviceClient is the client API for Device service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type DeviceClient interface {
+	Handle(ctx context.Context, in *Request, opts ...grpc.CallOption) (*Response, error)
+}
+
+type deviceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewDeviceClient(cc grpc.ClientConnInterface) DeviceClient {
+	return &deviceClient{cc}
+}
+
+func (c *deviceClient) Handle(ctx context.Context, in *Request, opts ...grpc.CallOption) (*Response, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Response)
+	err := c.cc.Invoke(ctx, Device_Handle_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DeviceServer is the server API for Device service.
+// All implementations must embed UnimplementedDeviceServer
+// for forward compatibility.
+type DeviceServer interface {
+	Handle(context.Context, *Request) (*Response, error)
+	mustEmbedUnimplementedDeviceServer()
+}
+
+// UnimplementedDeviceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedDeviceServer struct{}
+
+func (UnimplementedDeviceServer) Handle(context.Context, *Request) (*Response, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Handle not implemented")
+}
+func (UnimplementedDeviceServer) mustEmbedUnimplementedDeviceServer() {}
+func (UnimplementedDeviceServer) testEmbeddedByValue()                {}
+
+// UnsafeDeviceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to DeviceServer will
+// result in compilation errors.
+type UnsafeDeviceServer interface {
+	mustEmbedUnimplementedDeviceServer()
+}
+
+func RegisterDeviceServer(s grpc.ServiceRegistrar, srv DeviceServer) {
+	// If the following call pancis, it indicates UnimplementedDeviceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&Device_ServiceDesc, srv)
+}
+
+func _Device_Handle_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Request)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DeviceServer).Handle(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Device_Handle_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DeviceServer).Handle(ctx, req.(*Request))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Device_ServiceDesc is the grpc.ServiceDesc for Device service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Device_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "SpaceX.API.Device.Device",
+	HandlerType: (*DeviceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Handle",
+			Handler:    _Device_Handle_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "internal/starlink/pb/starlink.proto",
+}

internal/starlink/starlink.go

@@ -0,0 +1,81 @@
+// Package starlink detects a Starlink dish on the local network and reads a
+// short status summary from the dish's local gRPC endpoint. Detection and
+// the status fetch sit behind the Client interface, so the monitor is
+// tested with a fake and needs no dish and no network. Render turns a
+// Status into the two lines the UI draws and is a pure function.
+package starlink
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// Address is the dish's fixed local gRPC endpoint. Every dish answers here
+// from behind the Starlink router, whatever the LAN's own addressing is, so
+// this is not the default gateway (that is the router).
+const Address = "192.168.100.1:9200"
+
+// StateConnected is the dish state string that means the link is up; any
+// other state is treated as an alert condition by Render.
+const StateConnected = "CONNECTED"
+
+// Units used when reducing the dish's raw values to display values.
+const (
+	percentScale   = 100.0
+	bitsPerMegabit = 1_000_000.0
+	hoursPerDay    = 24
+	minutesPerHour = 60
+)
+
+// Status is the subset of the dish's get_status response that rtnetmon
+// shows. Throughput is megabits per second; obstruction and drop are
+// percentages on a 0..100 scale.
+type Status struct {
+	State          string
+	Uptime         time.Duration
+	ObstructionPct float64
+	Alerts         int
+	PopPingMs      float64
+	PopPingDropPct float64
+	DownlinkMbps   float64
+	UplinkMbps     float64
+}
+
+// Client probes for a dish and reads its status. The real implementation
+// speaks gRPC to Address over one bound interface; tests use a fake.
+type Client interface {
+	// Probe reports whether a dish answers on Address over the bound
+	// interface. It is cheap: a TCP connect, no gRPC call.
+	Probe(ctx context.Context) bool
+	// Status fetches the dish's current status.
+	Status(ctx context.Context) (Status, error)
+}
+
+// Render formats a Status as the two status lines drawn under the physical
+// pane, and reports whether they warrant an alert (red) color: the dish is
+// not connected, or an alert is active.
+func Render(s Status) (string, string, bool) {
+	line1 := fmt.Sprintf(
+		"Starlink: %s  uptime %s  obstruction %.1f%%  alerts %d",
+		s.State, formatUptime(s.Uptime), s.ObstructionPct, s.Alerts)
+	line2 := fmt.Sprintf(
+		"  pop ping %.0fms / drop %.1f%%  down %.1fMbps / up %.1fMbps",
+		s.PopPingMs, s.PopPingDropPct, s.DownlinkMbps, s.UplinkMbps)
+	alert := s.State != StateConnected || s.Alerts > 0
+
+	return line1, line2, alert
+}
+
+// formatUptime renders a duration as whole days, hours and minutes.
+func formatUptime(d time.Duration) string {
+	if d < 0 {
+		d = 0
+	}
+
+	days := int64(d / (hoursPerDay * time.Hour))
+	hours := int64(d/time.Hour) % hoursPerDay
+	mins := int64(d/time.Minute) % minutesPerHour
+
+	return fmt.Sprintf("%dd %dh %dm", days, hours, mins)
+}

internal/starlink/starlink_test.go

@@ -0,0 +1,79 @@
+package starlink_test
+
+import (
+	"testing"
+	"time"
+
+	"git.eeqj.de/sneak/rtnetmon/internal/starlink"
+)
+
+func TestRender(t *testing.T) {
+	t.Parallel()
+
+	connected := starlink.Status{
+		State:          "CONNECTED",
+		Uptime:         3*24*time.Hour + 4*time.Hour + 12*time.Minute,
+		ObstructionPct: 0.1,
+		Alerts:         0,
+		PopPingMs:      34,
+		PopPingDropPct: 0.0,
+		DownlinkMbps:   145.3,
+		UplinkMbps:     12.1,
+	}
+
+	tests := []struct {
+		name      string
+		status    starlink.Status
+		wantLine1 string
+		wantLine2 string
+		wantAlert bool
+	}{
+		{
+			name:      "connected, no alert",
+			status:    connected,
+			wantLine1: "Starlink: CONNECTED  uptime 3d 4h 12m  obstruction 0.1%  alerts 0",
+			wantLine2: "  pop ping 34ms / drop 0.0%  down 145.3Mbps / up 12.1Mbps",
+			wantAlert: false,
+		},
+		{
+			name: "searching is an alert",
+			status: starlink.Status{
+				State:  "SEARCHING",
+				Uptime: 0,
+			},
+			wantLine1: "Starlink: SEARCHING  uptime 0d 0h 0m  obstruction 0.0%  alerts 0",
+			wantLine2: "  pop ping 0ms / drop 0.0%  down 0.0Mbps / up 0.0Mbps",
+			wantAlert: true,
+		},
+		{
+			name: "connected but alerts active",
+			status: starlink.Status{
+				State:  "CONNECTED",
+				Uptime: 90 * time.Minute,
+				Alerts: 2,
+			},
+			wantLine1: "Starlink: CONNECTED  uptime 0d 1h 30m  obstruction 0.0%  alerts 2",
+			wantLine2: "  pop ping 0ms / drop 0.0%  down 0.0Mbps / up 0.0Mbps",
+			wantAlert: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			line1, line2, alert := starlink.Render(tt.status)
+			if line1 != tt.wantLine1 {
+				t.Errorf("line1 = %q, want %q", line1, tt.wantLine1)
+			}
+
+			if line2 != tt.wantLine2 {
+				t.Errorf("line2 = %q, want %q", line2, tt.wantLine2)
+			}
+
+			if alert != tt.wantAlert {
+				t.Errorf("alert = %v, want %v", alert, tt.wantAlert)
+			}
+		})
+	}
+}