How to prevent loopback publish when mosquitto bridged with RabbitMQ MQTT?

_x000D_ _x000D_ I have two mosquitto brokers installed on PC1 (mosquitto v1.4.8) and PC2 (RabbitMQ v3.6.2 with MQTT Adapter). Bridging initiated at PC1 like below sensor/room1/ <-> office/room1/ But I noticed there is always a duplicate message being published back whenever the bridge is active, means all my application (on PC1) which subscribes to the same topic will receives the same message twice. What setting I did wrong here? PC1 mosquitto.conf connection bridge-pc1-to-pc2 address pc2-address.com topic room1/# both 2 sensor/ office/ bridge_protocol_version mqttv311 notifications true cleansession true try_private false To test loopback issue, I had PC1 subscribed to topic sensor/# mosquitto_sub -t sensor/# -v -d Then at PC1 I publish a test message mosquitto_pub -t sensor/room1/temperature -m '{"value":27.3, "timestamp":"2016-06-03 14:02:38"}' Broker at cloud (PC2) received the message correctly (message received only once) Client mosqsub/3121-Dennis-iMa sending CONNECT Client mosqsub/3121-Dennis-iMa received CONNACK Client mosqsub/3121-Dennis-iMa sending SUBSCRIBE (Mid: 1, Topic: office/#, QoS: 0) Client mosqsub/3121-Dennis-iMa received SUBACK Subscribed (mid: 1): 0 Client mosqsub/3121-Dennis-iMa received PUBLISH (d0, q0, r0, m0, 'office/room1/temperature', ... (14 bytes)) office/room1/temperature {"value":27.3, "timestamp":"2016-06-03 14:02:38"} But PC1 received the same message twice! Below is the Pi's output Received CONNACK Received SUBACK Subscribed (mid: 1): 0 Received PUBLISH (d0, q0, r0, m0, 'sensor/room1/temperature', ... (14 bytes)) sensor/room1/temperature {"value":27.3, "timestamp":"2016-06-03 14:02:38"} Received PUBLISH (d0, q0, r0, m0, 'sensor/room1/temperature', ... (14 bytes)) sensor/room1/temperature {"value":27.3, "timestamp":"2016-06-03 14:02:38"} Why there is loopback published message and how to solve this? Update 3 Jun 2016 This is not the same question with this question, as it does not involve horizontal scaling (1-to-many brokers)