Issues about "broadcast message" in WebSocket with Meshblu 4.0.1

[cydemily]

Hello,
I met below issues on “broadcast messages” function in WebSocket protocol by using Meshblu 4.0.1 instead of Meshblu 1.18.4.

Test scenario:

1. Register device#1 and device#2 with WebSocket protocol.
2. Device#2 subscribes device#1, and set it online.
3. Set device#1 online, and broadcast a message.
4. Observe that device#2 received two duplicated messages from device#1.

Is this a bug or new feature?
@chrismatthieu