Cannot connect to device

[ztolley]

I have a BLE device that I've successfully scanned for and connected to in a simple diagnostic SwiftUI app, now I'm trying to talk to it from a command line app written in Go that will ultimately run on Linux.

I can scan for my device and read the advertised manufacturer data but when I try to connect (which should take no longer than 4-5 seconds) the code just sits there and never responds.

I've created a minimal example of what I'm doing:

package main

import (
	"fmt"

	"tinygo.org/x/bluetooth"
)

func main() {
	targetUUID := bluetooth.NewUUID([16]byte{0xb7, 0x31, 0x81, 0x0c, 0x26, 0x62, 0x8c, 0x80, 0x5f, 0x4f, 0xfa, 0x1f, 0x53, 0x3e, 0x9d, 0x11})

	Adapter := bluetooth.DefaultAdapter
	must("enable BLE stack", Adapter.Enable())

	fmt.Printf("Start scanning for devices\n")

	must("start scan", Adapter.Scan(func(adapter *bluetooth.Adapter, device bluetooth.ScanResult) {
		if device.HasServiceUUID(targetUUID) {
			fmt.Printf("Found device %s\nConnecting\n", device.Address.String())

			peripheral, err := Adapter.Connect(device.Address, bluetooth.ConnectionParams{})

			if err != nil {
				fmt.Printf("Failed to connect to device %s: %v\n", device.Address.String(), err)
				return
			}

			fmt.Printf("Connected to device %s\n", device.Address.String())
			peripheral.Disconnect()
			Adapter.StopScan()
		}
	}))

}

func must(action string, err error) {
	if err != nil {
		panic("failed to " + action + ": " + err.Error())
	}
}

When I run this the only output is:

Start scanning for devices
Found device bfc981a3-dd25-77a0-31af-04d7ff2d69b0
Connecting

Am I doing something fundamentally wrong?

I've also successfully connected to the same device using Rust/btleplug so I'm confident the device works.

[deadprogram]

I would suggest look at the examples here https://github.com/tinygo-org/bluetooth/tree/release/examples/discover and here https://github.com/tinygo-org/bluetooth/tree/release/examples/heartrate-monitor for how to connect as a Central to a Peripheral.

Hope that helps!

[ztolley]

I tried those . I've done more testing and the problem seems to be only when running on Linux . Runs fine on Mac, in fact:

1: Run on linux, get unable to connect - Times out - bluetooth: failed to connect: le-connection-abort-by-local
2: Run same code on MacOS - The occasional connection failure but connects and I can read services, characteristics and read data
3: Run on linux again - Works fine.

After a while Linux stops working and I have to run it on the mac again

I suspect this is something to do with Bluez so feel free to close this ticket unless anyone out there has a clue why, otherwise I'll go to Stack Overflow :)