fermentord/pkg/tilt/tilt.go
Søren Rasmussen 19a79f0e59
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Log tilt readings
2022-07-24 08:28:16 +02:00

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