From ada90768863797fcd0df421c979be15c01e1d2ef Mon Sep 17 00:00:00 2001
From: Ron Evans <ron@hybridgroup.com>
Date: Sat, 29 Aug 2020 18:13:45 +0200
Subject: [PATCH] examples: add discover example that shows
 services/characteristics

Signed-off-by: Ron Evans <ron@hybridgroup.com>
---
 examples/discover/main.go | 66 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 examples/discover/main.go

diff --git a/examples/discover/main.go b/examples/discover/main.go
new file mode 100644
index 0000000..dd388ea
--- /dev/null
+++ b/examples/discover/main.go
@@ -0,0 +1,66 @@
+package main
+
+import (
+	"os"
+
+	"github.com/tinygo-org/bluetooth"
+)
+
+var adapter = bluetooth.DefaultAdapter
+
+func main() {
+	if len(os.Args) < 2 {
+		println("usage: discover [local name]")
+		os.Exit(1)
+	}
+
+	// look for device with specific name
+	name := os.Args[1]
+
+	// Enable BLE interface.
+	must("enable BLE stack", adapter.Enable())
+
+	ch := make(chan bluetooth.ScanResult, 1)
+
+	// Start scanning.
+	println("scanning...")
+	err := adapter.Scan(func(adapter *bluetooth.Adapter, result bluetooth.ScanResult) {
+		println("found device:", result.Address.String(), result.RSSI, result.LocalName())
+		if result.LocalName() == name {
+			adapter.StopScan()
+			ch <- result
+		}
+	})
+
+	var device *bluetooth.Device
+	select {
+	case result := <-ch:
+		device, err = adapter.Connect(result.Address, bluetooth.ConnectionParams{})
+		if err != nil {
+			println(err.Error())
+			os.Exit(1)
+		}
+
+		println("connected to ", result.LocalName())
+	}
+
+	// get services
+	println("discovering services/characteristics")
+	srvcs, err := device.DiscoverServices(nil)
+	for _, srvc := range srvcs {
+		println("- service", srvc.UUID.String())
+
+		chars, _ := srvc.DiscoverCharacteristics(nil)
+		for _, char := range chars {
+			println("-- characteristic", char.UUID.String())
+		}
+	}
+
+	must("start scan", err)
+}
+
+func must(action string, err error) {
+	if err != nil {
+		panic("failed to " + action + ": " + err.Error())
+	}
+}