How to make a Telegram bot that opens the door with an electromagnetic lock using Go lang, Raspberry Pi and a soldering iron

package main import ( //   "log" "io/ioutil" "path/filepath" "strings" "time" //  yaml  "gopkg.in/yaml.v2" //     rpi "github.com/stianeikeland/go-rpio" //     telegram API "github.com/Syfaro/telegram-bot-api" ) type Config struct { //    Token string `yaml:"token"` //    AllowedChatIds []int `yaml:"allowed_chat_ids"` //      OpenDoorPhrases []string `yaml:"open_door_phrases"` TurnLedOnPhrases []string `yaml:"turn_led_on_phrases"` TurnLedOffPhrases []string `yaml:"turn_led_off_phrases"` } var bot *tgbotapi.BotAPI var config *Config var OpenDoorPhrases []string var TurnLedOnPhrases []string var TurnLedOffPhrases []string var AllowedChatIds []int var doorOpened chan *tgbotapi.Message var ledTurnedOn chan *tgbotapi.Message var ledTurnedOff chan *tgbotapi.Message var doorPin = rpio.Pin(10) var ledPin = rpio.Pin(9) func readConfig() (*Config, error) { var yamlFile []byte var err error filename, _ := filepath.Abs("./config.yml") yamlFile, err = ioutil.ReadFile(filename) if err != nil { return nil, err } var conf Config if err := yaml.Unmarshal(yamlFile, &conf); err != nil { return nil, err } return &conf, err } func main() { var err error //   if config, err = readConfig(); err != nil { panic(err) } //   bot, err = tgbotapi.NewBotAPI(config.Token) if err != nil { log.Panic(err) } //    gpio  rpi if err = rpio.Open(); err != nil { log.Panic(err) } defer rpio.Close() //    output ledPin.Output() doorPin.Output() //     doorOpened = make(chan *tgbotapi.Message) ledTurnedOn = make(chan *tgbotapi.Message) ledTurnedOff = make(chan *tgbotapi.Message) AllowedChatIds = config.AllowedChatIds OpenDoorPhrases = config.OpenDoorPhrases TurnLedOnPhrases = config.TurnLedOnPhrases TurnLedOffPhrases = config.TurnLedOffPhrases log.Printf("Authorized on account %s", bot.Self.UserName) var ucfg tgbotapi.UpdateConfig = tgbotapi.NewUpdate(0) ucfg.Timeout = 60 err = bot.UpdatesChan(ucfg) //   go Listen() ListenUpdates() } func OpenDoor() chan<- *tgbotapi.Message { //   go launchDoor() return (chan<-*tgbotapi.Message)(doorOpened) } func TurnLedOn() chan<- *tgbotapi.Message { //   ledPin.High() return (chan<-*tgbotapi.Message)(ledTurnedOn) } func TurnLedOff() chan<- *tgbotapi.Message { //   ledPin.Low() return (chan<-*tgbotapi.Message)(ledTurnedOff) } //   func launchDoor() { log.Println("door is beeing opened") doorPin.High() ledPin.High() time.Sleep(100*time.Millisecond) doorPin.Low() ledPin.Low() } // ,      func tryToDo(text string, phrases []string) bool { for i:=0; i<len(phrases); i++ { if strings.ToLower(text) == phrases[i] { return true } } return false } // ,      func auth(chatId int) bool { for i:=0; i<len(AllowedChatIds); i++ { if chatId == AllowedChatIds[i] { return true } } return false } //   func send(chatId int, msg string) { log.Println(msg) bot_msg := tgbotapi.NewMessage(chatId, msg) bot.SendMessage(bot_msg) } func Listen() { for { select { case msg := <- doorOpened: reply := msg.From.FirstName + " () " send(msg.Chat.ID, reply) case msg := <- ledTurnedOn: reply := msg.From.FirstName + " () " send(msg.Chat.ID, reply) case msg := <- ledTurnedOff: reply := msg.From.FirstName + " () " send(msg.Chat.ID, reply) } } } func ListenUpdates() { for { select { case update := <-bot.Updates: userName := update.Message.From.UserName chatID := update.Message.Chat.ID text := update.Message.Text //       if !auth(chatID) { reply := "   " log.Println(reply) bot_msg := tgbotapi.NewMessage(chatID, reply) bot.SendMessage(bot_msg) continue } log.Printf("[%s] %d %s", userName, chatID, text) //     , /  if tryToDo(text, OpenDoorPhrases) { OpenDoor() <- &update.Message } if tryToDo(text, TurnLedOnPhrases) { TurnLedOn() <- &update.Message } if tryToDo(text, TurnLedOffPhrases) { TurnLedOff() <- &update.Message } } } }