Søren Rasmussen
19a79f0e59
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96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
// MIT License
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//
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// Copyright (c) 2020 Alex Howarth
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package tilt
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import (
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"encoding/hex"
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"log"
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"math"
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"github.com/pkg/errors"
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)
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// tiltIdentifier iBeacon identifier portion (4c000215) as well as Tilt specific uuid preamble (a495)
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const tiltIdentifier = "4c000215a495"
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// ErrNotTilt - the BLE device does not match anything in tiltType
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var ErrNotTilt = errors.New("Not a Tilt iBeacon")
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// Color of the Tilt
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type Color string
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var tiltType = map[string]Color{
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"a495bb10c5b14b44b5121370f02d74de": "Red",
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"a495bb20c5b14b44b5121370f02d74de": "Green",
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"a495bb30c5b14b44b5121370f02d74de": "Black",
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"a495bb40c5b14b44b5121370f02d74de": "Purple",
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"a495bb50c5b14b44b5121370f02d74de": "Orange",
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"a495bb60c5b14b44b5121370f02d74de": "Blue",
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"a495bb70c5b14b44b5121370f02d74de": "Yellow",
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"a495bb80c5b14b44b5121370f02d74de": "Pink",
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}
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// Tilt struct
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type Tilt struct {
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col Color
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temp uint16
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sg uint16
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}
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// NewTilt returns a Tilt from an iBeacon
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func NewTilt(b *IBeacon) (t Tilt, err error) {
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if col, ok := tiltType[b.UUID]; ok {
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t = Tilt{col: col, temp: b.Major, sg: b.Minor}
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return
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}
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err = ErrNotTilt
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return
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}
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// IsTilt tests if the data is from a Tilt
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func IsTilt(d []byte) bool {
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if len(d) >= 25 && hex.EncodeToString(d)[0:12] == tiltIdentifier {
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return true
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}
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return false
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}
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func (t *Tilt) Celsius() float64 {
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return math.Round(float64(t.temp-32)/1.8*100) / 100
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}
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func (t *Tilt) Fahrenheit() uint16 {
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return t.temp
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}
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func (t *Tilt) Gravity() float64 {
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return float64(t.sg) / 1000
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}
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func (t *Tilt) Color() Color {
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return t.col
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}
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func (t *Tilt) Print() {
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log.Printf("Tilt: color=%v specific_gravity=%v temp_celcius=%v", t.Color(), t.Gravity(), t.Celsius())
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}
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