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package main
import (
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
"xengineering.eu/homematic-go/homematic"
)
const (
OPENCCU = `http://127.0.0.1:8080`
BROKER = `tcp://127.0.0.1:1883`
CLIENT_ID = `sia-server`
TOPIC_PREFIX = `sia`
QOS = byte(0)
RETAINED = false
MQTT_CONNECT_TIMEOUT = time.Second * 5
MQTT_DISCONNECT_TIMEOUT_US = 500
POLLING_PERIOD = 500 * time.Millisecond
)
func main() {
log.Println("+++ Started Sia server +++")
defer log.Println("--- Stopped Sia server ---")
go func() {
req, inventory, client, err := Start()
defer Stop(client)
if err != nil {
log.Fatalf("Failed startup process: %v", err)
}
for {
start := time.Now()
err = Poll(req, inventory, client)
if err != nil {
log.Fatalf("Failed to poll states: %v", err)
}
WaitUntil(start.Add(POLLING_PERIOD))
}
}()
Await(syscall.SIGTERM, syscall.SIGINT)
}
func ConnectMQTT(broker string, id string) (mqtt.Client, error) {
opts := mqtt.NewClientOptions()
opts.AddBroker(broker)
opts.SetClientID(id)
opts.SetCleanSession(true)
client := mqtt.NewClient(opts)
token := client.Connect()
success := token.WaitTimeout(MQTT_CONNECT_TIMEOUT)
if !success {
return client, fmt.Errorf("Timed out after %v.", MQTT_CONNECT_TIMEOUT)
}
err := token.Error()
if err != nil {
return client, err
}
return client, nil
}
func Start() (homematic.Requester, homematic.Devices, mqtt.Client, error) {
var req homematic.Requester
var inventory homematic.Devices
var client mqtt.Client
var err error
req = homematic.NewRequester(OPENCCU)
log.Printf("Created Homematic requester (%s).", OPENCCU)
inventory, err = req.ListDevices()
if err != nil {
return req, inventory, client, fmt.Errorf("Failed getting initial device list: %w", err)
}
log.Printf("Retrieved Homematic inventory with %d devices.", len(inventory))
client, err = ConnectMQTT(BROKER, CLIENT_ID)
if err != nil {
return req, inventory, client, fmt.Errorf("Failed connecting to MQTT broker: %w", err)
}
log.Printf("Connected to MQTT broker (%s).", BROKER)
return req, inventory, client, nil
}
func Stop(c mqtt.Client) {
c.Disconnect(MQTT_DISCONNECT_TIMEOUT_US)
log.Println("Disconnected from MQTT broker.")
}
func Poll(req homematic.Requester, inventory homematic.Devices, client mqtt.Client) error {
for _, device := range inventory {
if device.Type == `SHUTTER_CONTACT` {
state, err := req.GetValue(device.Address)
if err != nil {
return fmt.Errorf("Failed to get value: %w", err)
}
topic := fmt.Sprintf("%s/contact/%s/state", TOPIC_PREFIX, device.Address)
payload := []byte(fmt.Sprintf("%t", state))
_ = client.Publish(topic, QOS, RETAINED, payload)
}
}
return nil
}
func Await(signals ...syscall.Signal) {
listener := make(chan os.Signal)
for _, s := range signals {
signal.Notify(listener, s)
}
sig := <-listener
log.Printf("Received OS signal '%v'\n", sig)
}
func WaitUntil(deadline time.Time) {
duration := time.Until(deadline)
if duration > 0 {
time.Sleep(duration)
}
}
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