Add `Retain` attribute to MQTTMessage

This allows the sending part of the code to decide about the retain
flag. The MQTT go routine will set it accordingly.

1 files changed, 1 insertions, 0 deletions

diff --git a/cache.go b/cache.go
index 4e0eddc..18ce0c9 100644
--- a/cache.go
+++ b/cache.go
@@ -43,6 +43,7 @@ func (c *Cache) Update(states States) {
 			c.Tx <- MQTTMessage{
 				Topic: topic,
 				Payload: payload,
+				Retain: true,
 			}
 		}
 		c.States[id] = state