Update README.md

To state that broker heartbeat is on publish event and client will be null
moscajs · Jul 2, 2019 · eacd61f · eacd61f
1 parent 4f58599
commit eacd61f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -126,7 +126,7 @@ Events:
 * `publish`: when a new packet is published, arguments:
   1. `packet`
   2. `client`, it will be null if the message is published using
-     [`publish`](#publish).
+     [`publish`](#publish). It is by design that the broker heartbeat will be on publish event, in this case `client` is null
 * `ack`: when a packet published to a client is delivered successfully with QoS 1 or QoS 2, arguments:
   1. `packet`
   2. `client`