mqtt – EMQ X Broker Cluster -> HAProxy -> mosquitto_sub -> Network protocol error while communicating with the broker

Setting up the test environment in Hyper-V 2012R2, openSUSE Leap 15.1, using the EMQ X Broker Version 3.1 2-node cluster, HAProxy v1.6.

Everything works except for trying to execute a command mosquitto_sub.exe for the IP address HA_Proxy. I get the error message: "There was a network protocol error while communicating with the broker." I can run a mosquitto_sub.exe command to the IP of both brokers and it works fine – can send / receive messages. Attached is the file haproxy.cfg.

Many Thanks!


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Is the broker a design pattern and is it used in design patterns by Gamma et al. Mentioned?

Software architecture says Bass

The broker pattern defines a runtime component called a broker
mediates communication between multiple clients and servers.

The original version of the broker pattern as documented by Gamma, Helm, Johnson and Vlissides
[Gamma 94], is shown in Figure 13.6.

I do not find Gamma's book with a pattern called a broker. If the broker in Design Patterns by Gamma et al. Mentioned?

I can see that the broker is listed as an architectural pattern in
Is the broker a design pattern or architectural pattern?

Many Thanks.

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