Minor tweaks.

main.go

@@ -85,7 +85,7 @@ func eventloop() {
 	btns := make([]*widget.Button, 0)
 
 	var autoconnectID string // should load from config file
-	autoconnectID = "93D3A64F-1664-497D-8B01-77951DB8E0F3"
+	//autoconnectID = "93D3A64F-1664-497D-8B01-77951DB8E0F3"
 
 	var page, offpage, scanpage, connpage, hrpage func()
 
@@ -112,7 +112,8 @@ func eventloop() {
 				th.Button(periphs[i].Name).Layout(gtx, btns[i])
 				if btns[i].Clicked(gtx) {
 					b.StopScan()
-					b.Connect(periphs[i])
+					periph = periphs[i]
+					b.Connect(periph)
 					page = connpage
 					w.Invalidate()
 				}
@@ -159,6 +160,7 @@ func eventloop() {
 		case e := <-events:
 			switch e := e.(type) {
 			case ble.UpdateStateEvent:
+				fmt.Printf("UpdateState: %s\n", e.State)
 				state = e.State
 				if state != "powered on" {
 					page = offpage
@@ -172,9 +174,8 @@ func eventloop() {
 						b.Scan()
 					}
 				}
-				w.Invalidate()
 			case ble.DiscoverPeripheralEvent:
-				fmt.Printf("found %s\n", e.Peripheral.Identifier)
+				fmt.Printf("found %s (%s)\n", e.Peripheral.Name, e.Peripheral.Identifier)
 				periphs = append(periphs, e.Peripheral)
 				btns = append(btns, &widget.Button{})
 				if e.Peripheral.Identifier == autoconnectID {
@@ -186,14 +187,12 @@ func eventloop() {
 				periph = e.Peripheral
 				e.Peripheral.DiscoverServices()
 				page = hrpage
-				w.Invalidate()
 			case ble.ConnectTimeoutEvent:
 				fmt.Printf("Connect timeout\n")
 				state = "timeout"
 				autoconnectID = ""
 				page = scanpage
 				b.Scan()
-				w.Invalidate()
 			case ble.DiscoverServiceEvent:
 				fmt.Printf("DiscoverService %s\n", e.Gatt.UUID)
 				if e.Gatt.UUID == "180D" {
@@ -209,6 +208,7 @@ func eventloop() {
 			case ble.UpdateValueEvent:
 				hr = hrDecode(e.Data)
 			}
+			w.Invalidate() // refresh on any Bluetooth event
 		case <-tick.C:
 			w.Invalidate()
 		case e := <-w.Events():