74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
package mqttclient
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import (
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"encoding/json"
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"time"
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"github.com/diebietse/invertergui/mk2driver"
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mqtt "github.com/eclipse/paho.mqtt.golang"
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"github.com/sirupsen/logrus"
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)
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var log = logrus.WithField("ctx", "inverter-gui-mqtt")
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const keepAlive = 5 * time.Second
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// Config sets MQTT client configuration
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type Config struct {
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Broker string
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ClientID string
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Topic string
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Username string
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Password string
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}
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// New creates an MQTT client that starts publishing MK2 data as it is received.
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func New(mk2 mk2driver.Mk2, config Config) error {
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c := mqtt.NewClient(getOpts(config))
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if token := c.Connect(); token.Wait() && token.Error() != nil {
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return token.Error()
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}
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go func() {
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for e := range mk2.C() {
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if e.Valid {
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data, err := json.Marshal(e)
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if err != nil {
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log.Errorf("Could not parse data source: %v", err)
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continue
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}
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t := c.Publish(config.Topic, 0, false, data)
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t.Wait()
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if t.Error() != nil {
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log.Errorf("Could not publish data: %v", t.Error())
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}
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}
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}
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}()
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return nil
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}
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func getOpts(config Config) *mqtt.ClientOptions {
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opts := mqtt.NewClientOptions()
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opts.AddBroker(config.Broker)
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opts.SetClientID(config.ClientID)
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if config.Username != "" {
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opts.SetUsername(config.Username)
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}
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if config.Password != "" {
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opts.SetPassword(config.Password)
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}
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opts.SetKeepAlive(keepAlive)
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opts.SetOnConnectHandler(func(mqtt.Client) {
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log.Info("Client connected to broker")
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})
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opts.SetConnectionLostHandler(func(_ mqtt.Client, err error) {
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log.Errorf("Client connection to broker lost: %v", err)
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})
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return opts
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}
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