mqtt: (re-)subscribe to discover topic in onConnect() to ensure subsc…

…ription on reconnect or if Discover() is called before first connection

config: use filepath instead of path when generating clientIdb

transport/mqtt/config.go

@@ -8,7 +8,7 @@ import (
 	"github.com/google/uuid"
 	"net"
 	"os"
-	"path"
+	"path/filepath"
 	"strings"
 	"time"
 )
@@ -49,7 +49,7 @@ func (c *Config) check() error {
 		var id string
 		if len(os.Args) > 0 && len(os.Args[0]) > 0 {
 			// Use executable name as first part of id
-			id = path.Base(os.Args[0])
+			id = filepath.Base(os.Args[0])
 		} else {
 			id = "htlib"
 		}

transport/mqtt/mqtt.go

@@ -221,6 +221,12 @@ func (m *mqtt) onConnect(server string, _code byte, err error) {
 		}
 	}
 
+	if len(m.discoverSub) > 0 {
+		m.client.Subscribe(
+			&libmqtt.Topic{Name: m.discoverTopic},
+		)
+	}
+
 	if m.deviceState != nil {
 		m.sendDiscover()
 	}