From the example mosquitto.conf file:
# Choose the topic on which notification messages for this bridge are
# published. If not set, messages are published on the topic
# $SYS/broker/connection/<clientid>/state
#notification_topic
If you set a client-id for the bridge connection, I would think you would see the state change. Does this help?
From: mosquitto-dev-bounces@xxxxxxxxxxx [mailto:mosquitto-dev-bounces@xxxxxxxxxxx]
On Behalf Of Yu-Lun Shih
Sent: Wednesday, December 17, 2014 5:44 AM
To: mosquitto-dev@xxxxxxxxxxx
Subject: [mosquitto-dev] Is there anyway to subscribe clients/bridge DISCONNECT?
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I have noticed that the broker starting with debug option "-v" it will print some clients/bridges connect/disconnect events and I want to "Is there any way to subscribe those events?"
All I want to do is when someone drop it's connection I could know and WILL message seems like to be worked only with "clients" but no broker in bridge mode.