BLE advertisement length error

[gigaryte]

Hi!

I am trying to send a BLE advertisement with manufacturer specific data. My understanding is that when you do this, you have 27 bytes to play with for the actual data after the 2-byte company identifier.

However, I do not seem to be able to advertise anything beyond a 23-byte payload in the manufacturer data; anything above 23 bytes throws a FATA[0000] Failed to parse advertisement error. Am I doing something wrong?

MWE on Raspbery Pi 4, bluez 5.55, Raspbian w/kernel 6.1.21-v8

package main

import (
	log "github.com/sirupsen/logrus"
	"tinygo.org/x/bluetooth"
)

func main() {

	var adapter = bluetooth.DefaultAdapter
	adapter.Enable()

	advMap := make(map[uint16]interface{})

	//Works fine!
	//advMap[0x0000] = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}

	//Throws "Failed to parse advertisement" error
	advMap[0x0000] = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
		0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13,
		0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a}

	options := bluetooth.AdvertisementOptions{
		ManufacturerData: advMap,
	}

	adv := adapter.DefaultAdvertisement()
	if err := adv.Configure(options); err != nil {
		log.Fatalf("Error configuring advertisement: %v\n", err)
	}

	if err := adv.Start(); err != nil {
		log.Fatal(err)
	}

	select {}

}