85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
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// Test for setting connection parameters.
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//
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// To test this feature, run this either on a desktop OS or by flashing it to a
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// device with TinyGo. Then connect to it from a BLE connection debugger, for
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// example nRF Connect on Android. After a second, you should see in the log of
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// the BLE app that the connection latency has been updated. It might look
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// something like this:
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//
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// Connection parameters updated (interval: 510.0ms, latency: 0, timeout: 10000ms)
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package main
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import (
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"time"
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"tinygo.org/x/bluetooth"
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)
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var (
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adapter = bluetooth.DefaultAdapter
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newDevice chan bluetooth.Device
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)
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func main() {
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must("enable BLE stack", adapter.Enable())
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newDevice = make(chan bluetooth.Device, 1)
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adapter.SetConnectHandler(func(device bluetooth.Device, connected bool) {
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// If this is a new device, signal it to the separate goroutine.
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if connected {
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select {
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case newDevice <- device:
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default:
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}
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}
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})
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// Start advertising, so we can be found.
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const name = "Go BLE test"
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adv := adapter.DefaultAdvertisement()
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adv.Configure(bluetooth.AdvertisementOptions{
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LocalName: name,
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})
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adv.Start()
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println("advertising:", name)
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for device := range newDevice {
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println("connection from device:", device.Address.String())
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// Discover services and characteristics.
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svcs, err := device.DiscoverServices(nil)
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if err != nil {
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println(" failed to resolve services:", err)
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}
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for _, svc := range svcs {
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println(" service:", svc.UUID().String())
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chars, err := svc.DiscoverCharacteristics(nil)
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if err != nil {
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println(" failed to resolve characteristics:", err)
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}
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for _, char := range chars {
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println(" characteristic:", char.UUID().String())
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}
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}
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// Update connection parameters (as a test).
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time.Sleep(time.Second)
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err = device.RequestConnectionParams(bluetooth.ConnectionParams{
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MinInterval: bluetooth.NewDuration(495 * time.Millisecond),
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MaxInterval: bluetooth.NewDuration(510 * time.Millisecond),
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Timeout: bluetooth.NewDuration(10 * time.Second),
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})
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if err != nil {
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println(" failed to update connection parameters:", err)
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continue
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}
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println(" updated connection parameters")
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}
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}
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func must(action string, err error) {
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if err != nil {
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panic("failed to " + action + ": " + err.Error())
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}
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}
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