Toni Sučić ts95

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Wilfa Svart BLE Scale Protocol Documentation

This document outlines the Bluetooth Low Energy (BLE) protocol for communicating with Wilfa Svart Uni Scale devices, specifically the Gen 1 and Gen 2 models, the former being the model powered by AA batteries, and the latter being rechargeable with a USB-C cable. The implementation is reverse-engineered from official firmware behavior and the Android application.

Overview

The Wilfa Svart scale exposes BLE services and characteristics for:

Receiving weight data
Monitoring unit changes and other state updates
Sending commands (e.g., tare, change unit)

	import SwiftUI
	import MapKit

	extension Map {

	init<Items>(
	coordinateRegion: Binding<MKCoordinateRegion>,
	interactionModes: MapInteractionModes = .all,
	showsUserLocation: Bool = false,
	userTrackingMode: Binding<MapUserTrackingMode>? = nil,

	#!/bin/bash

	# Parameters
	source="$(pwd)/" # Track folder source where diffs are checked
	project_root=${0%/*} # Track project root folder
	swiftlint_path='swiftlint' # Track SwiftLint path

	changed_files () {
	sort -u \
	<(git diff --name-only --diff-filter=d --cached) \

	import Foundation
	import CoreLocation

	// based on https://gis.stackexchange.com/a/18740

	extension CLLocationCoordinate2D {
	var cartesian: CartesianCoordinate3D { .init(from: self) }

	// Returns the coordinates of the midpoint between point a and b.
	// Limitation: point a and b may not be diametrically opposite.

	import Foundation

	protocol AppendOnlyDatabaseProtocol {
	var count: Int { get }

	mutating func append(_ other: Data)

	subscript(index: Data.Index) -> UInt8 { get }
	subscript(bounds: Range<Data.Index>) -> Data { get }
	}

	import Foundation

	@propertyWrapper
	struct Injected<T> {
	private let keyPath: WritableKeyPath<InjectedValues, T>

	var wrappedValue: T {
	get { InjectedValues[keyPath] }
	set { InjectedValues[keyPath] = newValue }
	}

	import Foundation

	class AutoId {
	private init() {}

	static func newId() -> String {
	// Alphanumeric characters
	let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
	// The largest byte value that is a multiple of `char.length`.
	let maxMultiple = Int(256 / chars.count) * chars.count

	import Foundation

	extension Result: Codable where Success: Codable, Failure: Codable {

	public init(from decoder: Decoder) throws {
	let container = try decoder.container(keyedBy: CodingKeys.self)
	switch try container.decode(ResultType.self, forKey: .type) {
	case .success:
	self = .success(try container.decode(Success.self, forKey: .value))
	case .failure:

	import OrderedCollections

	protocol HasCacheCost {
	var cacheCost: Int { get }
	}

	extension HasCacheCost {
	var cacheCost: Int {
	type(of: self) == AnyObject.self ? 0 : MemoryLayout.size(ofValue: self)
	}