1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
// +build
package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"time"
"github.com/paypal/gatt"
"github.com/paypal/gatt/examples/option"
)
var done = make(chan struct{})
func onStateChanged(d gatt.Device, s gatt.State) {
fmt.Println("State:", s)
switch s {
case gatt.StatePoweredOn:
fmt.Println("Scanning...")
d.Scan([]gatt.UUID{}, false)
return
default:
d.StopScanning()
}
}
func onPeriphDiscovered(p gatt.Peripheral, a *gatt.Advertisement, rssi int) {
id := strings.ToUpper(flag.Args()[0])
if strings.ToUpper(p.ID()) != id {
return
}
// Stop scanning once we've got the peripheral we're looking for.
p.Device().StopScanning()
fmt.Printf("\nPeripheral ID:%s, NAME:(%s)\n", p.ID(), p.Name())
fmt.Println(" Local Name =", a.LocalName)
fmt.Println(" TX Power Level =", a.TxPowerLevel)
fmt.Println(" Manufacturer Data =", a.ManufacturerData)
fmt.Println(" Service Data =", a.ServiceData)
fmt.Println("")
p.Device().Connect(p)
}
func onPeriphConnected(p gatt.Peripheral, err error) {
fmt.Println("Connected")
defer p.Device().CancelConnection(p)
if err := p.SetMTU(500); err != nil {
fmt.Printf("Failed to set MTU, err: %s\n", err)
}
// Discovery services
ss, err := p.DiscoverServices(nil)
if err != nil {
fmt.Printf("Failed to discover services, err: %s\n", err)
return
}
for _, s := range ss {
msg := "Service: " + s.UUID().String()
if len(s.Name()) > 0 {
msg += " (" + s.Name() + ")"
}
fmt.Println(msg)
// Discovery characteristics
cs, err := p.DiscoverCharacteristics(nil, s)
if err != nil {
fmt.Printf("Failed to discover characteristics, err: %s\n", err)
continue
}
for _, c := range cs {
msg := " Characteristic " + c.UUID().String()
if len(c.Name()) > 0 {
msg += " (" + c.Name() + ")"
}
msg += "\n properties " + c.Properties().String()
fmt.Println(msg)
// Read the characteristic, if possible.
if (c.Properties() & gatt.CharRead) != 0 {
b, err := p.ReadCharacteristic(c)
if err != nil {
fmt.Printf("Failed to read characteristic, err: %s\n", err)
continue
}
fmt.Printf(" value %x | %q\n", b, b)
}
// Discovery descriptors
ds, err := p.DiscoverDescriptors(nil, c)
if err != nil {
fmt.Printf("Failed to discover descriptors, err: %s\n", err)
continue
}
for _, d := range ds {
msg := " Descriptor " + d.UUID().String()
if len(d.Name()) > 0 {
msg += " (" + d.Name() + ")"
}
fmt.Println(msg)
// Read descriptor (could fail, if it's not readable)
b, err := p.ReadDescriptor(d)
if err != nil {
fmt.Printf("Failed to read descriptor, err: %s\n", err)
continue
}
fmt.Printf(" value %x | %q\n", b, b)
}
// Subscribe the characteristic, if possible.
if (c.Properties() & (gatt.CharNotify | gatt.CharIndicate)) != 0 {
f := func(c *gatt.Characteristic, b []byte, err error) {
fmt.Printf("notified: % X | %q\n", b, b)
}
if err := p.SetNotifyValue(c, f); err != nil {
fmt.Printf("Failed to subscribe characteristic, err: %s\n", err)
continue
}
}
}
fmt.Println()
}
fmt.Printf("Waiting for 5 seconds to get some notifiations, if any.\n")
time.Sleep(5 * time.Second)
}
func onPeriphDisconnected(p gatt.Peripheral, err error) {
fmt.Println("Disconnected")
close(done)
}
func main() {
flag.Parse()
if len(flag.Args()) != 1 {
log.Fatalf("usage: %s [options] peripheral-id\n", os.Args[0])
}
d, err := gatt.NewDevice(option.DefaultClientOptions...)
if err != nil {
log.Fatalf("Failed to open device, err: %s\n", err)
return
}
// Register handlers.
d.Handle(
gatt.PeripheralDiscovered(onPeriphDiscovered),
gatt.PeripheralConnected(onPeriphConnected),
gatt.PeripheralDisconnected(onPeriphDisconnected),
)
d.Init(onStateChanged)
<-done
fmt.Println("Done")
}
|
