Add autocnnect and connection timeouts.

main.go

@@ -15,8 +15,8 @@ import (
 	"gioui.org/app"
 	"gioui.org/io/system"
 	"gioui.org/layout"
-	"gioui.org/unit"
 	"gioui.org/text"
+	"gioui.org/unit"
 	"gioui.org/widget"
 	"gioui.org/widget/material"
 
@@ -67,18 +67,27 @@ func eventloop() {
 	margin := layout.UniformInset(unit.Dp(10))
 
 	b := ble.NewBLE()
-	b.Scan()
 
 	state := "starting"
 	var periph ble.Peripheral
-	periphs := make([]ble.Peripheral,0)
-	btns := make([]*widget.Button,0)
+	periphs := make([]ble.Peripheral, 0)
+	btns := make([]*widget.Button, 0)
 
-	var autoconnectID string
+	var autoconnectID string // should load from config file
+	autoconnectID = "93D3A64F-1664-497D-8B01-77951DB8E0F3"
 
-	var page, scanpage, connpage, hrpage func()
+	var page, offpage, scanpage, connpage, hrpage func()
 
 	f := &layout.Flex{Axis: layout.Vertical}
+	offpage = func() {
+		c1 := f.Rigid(gtx, func() {
+			th.Body1("Heart Rate Monitor").Layout(gtx)
+		})
+		c2 := f.Rigid(gtx, func() {
+			th.Body1("Bluetooth is Powered Off").Layout(gtx)
+		})
+		f.Layout(gtx, c1, c2)
+	}
 	scanpage = func() {
 		c1 := f.Rigid(gtx, func() {
 			th.Body1("Heart Rate Monitor").Layout(gtx)
@@ -91,18 +100,14 @@ func eventloop() {
 			lst.Layout(gtx, len(periphs), func(i int) {
 				th.Button(periphs[i].Name).Layout(gtx, btns[i])
 				if btns[i].Clicked(gtx) {
-					periph = periphs[i]
 					b.StopScan()
-					b.Connect(periph)
+					b.Connect(periphs[i])
 					page = connpage
 					w.Invalidate()
 				}
 			})
 		})
-		lst := &layout.List{Axis: layout.Vertical}
-		lst.Layout(gtx, 1, func(i int) {
-			f.Layout(gtx, c1, c2, c3)
-		})
+		f.Layout(gtx, c1, c2, c3)
 	}
 
 	connpage = func() {
@@ -126,14 +131,14 @@ func eventloop() {
 			th.Body1(periph.Name).Layout(gtx)
 		})
 		c3 := f.Rigid(gtx, func() {
-			l := th.H1(fmt.Sprintf("%d",b.HR()))
+			l := th.H1(fmt.Sprintf("%d", b.HR()))
 			l.Alignment = text.Middle
 			l.Layout(gtx)
 		})
 		f.Layout(gtx, c1, c2, c3)
 	}
 
-	page = scanpage
+	page = offpage
 
 	tick := time.NewTicker(time.Second / 30)
 	events := b.Events()
@@ -144,23 +149,42 @@ func eventloop() {
 			switch e := e.(type) {
 			case ble.UpdateStateEvent:
 				state = e.State
+				if state != "powered on" {
+					page = offpage
+				} else {
+
+					if autoconnectID != "" {
+						b.Connect(ble.Peripheral{Identifier: autoconnectID})
+						page = connpage
+					} else {
+						page = scanpage
+						b.Scan()
+					}
+				}
+				w.Invalidate()
 			case ble.DiscoverEvent:
 				fmt.Printf("found %s\n", e.Peripheral.Identifier)
 				periphs = append(periphs, e.Peripheral)
-				//btns = append(btns, th.Button(e.Peripheral.Name))
 				btns = append(btns, &widget.Button{})
-				fmt.Printf("len(periphs) = %d\n", len(periphs))
 				if e.Peripheral.Identifier == autoconnectID {
 					b.Connect(e.Peripheral)
 				}
 			case ble.ConnectEvent:
 				fmt.Printf("Connect event\n")
 				state = "connected"
+				periph = e.Peripheral
 				ble.DiscoverServices(e.Peripheral)
 				page = hrpage
 				w.Invalidate()
+			case ble.ConnectTimeoutEvent:
+				fmt.Printf("Connect timeout\n")
+				state = "timeout"
+				autoconnectID = ""
+				page = scanpage
+				b.Scan()
+				w.Invalidate()
 			}
-		case <- tick.C:
+		case <-tick.C:
 			w.Invalidate()
 		case e := <-w.Events():
 			switch e := e.(type) {