change ping pong handler and fix blocking channel

driver/artNet.go

@@ -102,15 +102,18 @@ func (d *ArtNetDriver) Connect(ip, id string, port uint) error {
 	}
 
 	client.OnMessage = func(data []byte) {
-
 		request := json_data.NewResponse()
+
 		err = json.Unmarshal(data, &request)
+
 		if err != nil {
 			return
 		}
+
 		if request.Subscribe != nil {
 			d.Subscribe(request.Subscribe...)
 		}
+
 		if request.Publish != nil {
 			d.Publish(request.Publish...)
 		}
@@ -138,6 +141,9 @@ func (d *ArtNetDriver) Connect(ip, id string, port uint) error {
 // send data to all buses that the send flage is true
 func (d *ArtNetDriver) SendData() {
 	for _, bus := range d.Buses {
+		if !bus.Reachable {
+			continue
+		}
 		bus.Send <- bus.Data
 	}
 }