bluetooth with fake data.

cmd/bridge/main.go

@@ -1,12 +1,16 @@
 package main
 
 import (
+	"encoding/binary"
 	"fmt"
+	"os/exec"
+	"time"
 
 	"github.com/google/gousb"
+	"tinygo.org/x/bluetooth"
 )
 
-func main() {
+func oldMain() {
 
 	var vendorId gousb.ID = 0x0fcf
 	var productId gousb.ID = 0x1008
@@ -16,3 +20,69 @@ func main() {
 
 	fmt.Println("channel closed")
 }
+
+var adapter = bluetooth.DefaultAdapter
+
+func main() {
+	exec.Command("hciconfig", "hci0", "down").Run()
+	exec.Command("hciconfig", "hci0", "up").Run()
+
+	must(adapter.Enable())
+
+	var powerChar bluetooth.Characteristic
+
+	must(adapter.AddService(&bluetooth.Service{
+		UUID: bluetooth.New16BitUUID(0x1818),
+		Characteristics: []bluetooth.CharacteristicConfig{
+			{
+				UUID:  bluetooth.New16BitUUID(0x2A65), // Cycling Power Feature
+				Flags: bluetooth.CharacteristicReadPermission,
+				Value: []byte{0, 0, 0, 0},
+			},
+			{
+				UUID:   bluetooth.New16BitUUID(0x2A63), // Cycling Power Measurement
+				Flags:  bluetooth.CharacteristicNotifyPermission,
+				Handle: &powerChar,
+			},
+		},
+	}))
+
+	must(adapter.DefaultAdvertisement().Configure(bluetooth.AdvertisementOptions{
+		LocalName:    "LinuxAntBtBridge",
+		ServiceUUIDs: []bluetooth.UUID{bluetooth.New16BitUUID(0x1818)},
+	}))
+	must(adapter.DefaultAdvertisement().Start())
+	fmt.Println("BLE advertising...")
+	var crankRevs uint16
+	var lastCrankEventTime uint16
+
+	for {
+		sec := time.Now().Second()
+		watts := uint16(100 + sec)
+		rpm := uint16(50 + sec)
+
+		// advance crank event time based on rpm
+		// time between crank events = 1024*60/rpm ticks
+		crankEventInterval := uint16(1024 * 60 / rpm)
+		lastCrankEventTime += crankEventInterval
+		crankRevs++
+
+		// flags: bit 5 = crank revolution data present
+		payload := make([]byte, 8)
+		binary.LittleEndian.PutUint16(payload[0:], 0x20)
+		binary.LittleEndian.PutUint16(payload[2:], watts)
+		binary.LittleEndian.PutUint16(payload[4:], crankRevs)
+		binary.LittleEndian.PutUint16(payload[6:], lastCrankEventTime)
+
+		powerChar.Write(payload)
+		fmt.Printf("watts: %d  rpm: %d  crankRevs: %d  eventTime: %d\n", watts, rpm, crankRevs, lastCrankEventTime)
+
+		time.Sleep(time.Second)
+	}
+}
+
+func must(err error) {
+	if err != nil {
+		panic(err)
+	}
+}

go.mod

@@ -2,6 +2,22 @@ module git.wamblee.org/antplusbridge
 
 go 1.26.2
 
-require github.com/half2me/antgo v0.0.0-20240825222428-e6b9ddc9c32f
+require (
+	github.com/half2me/antgo v0.0.0-20240825222428-e6b9ddc9c32f
+	tinygo.org/x/bluetooth v0.15.0
+)
 
-require github.com/google/gousb v1.1.3 // indirect
+require (
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/google/gousb v1.1.3
+	github.com/saltosystems/winrt-go v0.0.0-20260317170058-9c2fec580d96 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/soypat/cyw43439 v0.1.0 // indirect
+	github.com/soypat/lneto v0.1.0 // indirect
+	github.com/soypat/seqs v0.0.0-20250124201400-0d65bc7c1710 // indirect
+	github.com/tinygo-org/cbgo v0.0.4 // indirect
+	github.com/tinygo-org/pio v0.3.0 // indirect
+	golang.org/x/exp v0.0.0-20241204233417-43b7b7cde48d // indirect
+	golang.org/x/sys v0.11.0 // indirect
+)

go.sum

@@ -1,4 +1,47 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
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 github.com/google/gousb v1.1.3 h1:xt6M5TDsGSZ+rlomz5Si5Hmd/Fvbmo2YCJHN+yGaK4o=
 github.com/google/gousb v1.1.3/go.mod h1:GGWUkK0gAXDzxhwrzetW592aOmkkqSGcj5KLEgmCVUg=
 github.com/half2me/antgo v0.0.0-20240825222428-e6b9ddc9c32f h1:T1EVnxPi3CqwmJdOs/s76vplnG8t0MEFmwo3bvHrZAo=
 github.com/half2me/antgo v0.0.0-20240825222428-e6b9ddc9c32f/go.mod h1:BXp/M+7//3V0GY2ytRJw4vcxZve8mQ0zRVuow+fANkE=
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+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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+github.com/sirupsen/logrus v1.5.0/go.mod h1:+F7Ogzej0PZc/94MaYx/nvG9jOFMD2osvC3s+Squfpo=
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