Windows: AdvertisementPayload empty

[universam1]

Thank you @jagobagascon and others for the work. Unfortunately on Windows (11) the AdvertisementPayload or manufacturer data is empty.
However, via Python I receive that data just fine, on the same machine.

Go results:

BTH01-A, Address: 38:1F:8D:6C:C8:EB, RSSI: -78, Data:&{{BTH01-A [] [] []}}
THB1-a, Address: 38:1F:8D:E9:87:2B, RSSI: -86, Data:&{{THB1-a [] [] []}}
BTH01-D, Address: 38:1F:8D:36:0D:CF, RSSI: -82, Data:&{{BTH01-D [] [] []}}
Amazfit GTS, Address: D3:52:C4:29:C6:C4, RSSI: -75, Data:&{{Amazfit GTS [] [] []}}

Go code:

package main

import (
	"fmt"
	"strings"

	"tinygo.org/x/bluetooth"
)

func main() {
	adapter := bluetooth.DefaultAdapter

	// Enable BLE adapter
	err := adapter.Enable()
	if err != nil {
		fmt.Printf("Error enabling adapter: %s\n", err)
		return
	}
	fmt.Println("Scanning for BLE devices...")
	err = adapter.Scan(func(adapter *bluetooth.Adapter, advertisement bluetooth.ScanResult) {
		// Check if the device name is available and starts with "BTH"
		if advertisement.LocalName() != "" && strings.Contains(advertisement.LocalName(), "T") {
			fmt.Printf("%s, Address: %s, RSSI: %d, Data:%v\n",
				advertisement.LocalName(),
				advertisement.Address.String(),
				advertisement.RSSI,
				advertisement.AdvertisementPayload,
			)
		}
	})

	if err != nil {
		fmt.Printf("Error during scan: %s\n", err)
	}
}

Python results:

Found Device - Name: BTH01-D, Address: 38:1F:8D:36:0D:CF, RSSI: -77
Advertisement Data: AdvertisementData(local_name='BTH01-D', service_data={'0000fcd2-0000-1000-8000-00805f9b34fb': b'@\x00\xa1\x015\x02\xf0\x04\x039!\x0c\xe6\t'}, rssi=-77)
Found Device - Name: BTH01-A, Address: 38:1F:8D:6C:C8:EB, RSSI: -71
Advertisement Data: AdvertisementData(local_name='BTH01-A', service_data={'0000fcd2-0000-1000-8000-00805f9b34fb': b'@\x00\xe9\x013\x023\x08\x03S\x17\x0c\xd2\t'}, rssi=-71)

Python code:

import asyncio
from bleak import BleakScanner

def print_advertisement(device, advertisement_data):
    # Check if the device name starts with "BTH"
    if device.name and device.name.startswith("BTH"):
        print(f"Found Device - Name: {device.name}, Address: {device.address}, RSSI: {device.rssi}")
        print("Advertisement Data:", advertisement_data)

async def main():
    # Start scanning with a callback to filter devices by name
    scanner = BleakScanner()
    scanner.register_detection_callback(print_advertisement)

    print("Scanning for BLE devices...")
    await scanner.start()
    
    # Scan for 30 seconds
    await asyncio.sleep(30000)
    await scanner.stop()

    print("Scan completed.")

# Run the main function
asyncio.run(main())

Any idea what could be fixed?

[universam1]

I see this from args.GetAdvertisement();
*advertisement.BluetoothLEAdvertisement {IUnknown: github.com/go-ole/go-ole.IUnknown {RawVTable: *(unreadable could not resolve interface type)}}

[deadprogram]

@universam1 please see comment here https://github.com/tinygo-org/bluetooth/blob/release/gap_windows.go#L37

[universam1]

Thank you @deadprogram , so what makes Python succeed here?

[deadprogram]

These comments are interesting here https://github.com/hbldh/bleak/blob/develop/bleak/backends/winrt/scanner.py#L126

Perhaps @jagobagascon can interpret this code to figure out how to parse this data?