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Module ngx_stream_mqtt_filter_module

The ngx_stream_mqtt_filter_module module (1.23.4) provides support for Message Queuing Telemetry Transport protocol (MQTT) versions 3.1.1 and 5.0.

This module is available as part of our commercial subscription.
Example Configuration 
listen            127.0.0.1:18883;
proxy_pass        backend;
proxy_buffer_size 16k;

mqtt             on;
mqtt_set_connect clientid "$client";
mqtt_set_connect username "$name";
Directives Syntax: mqtt on | off;
Default: 
mqtt off;
Context: stream, server

Enables the MQTT protocol for the given virtual server.

Syntax: mqtt_buffers number size;
Default: 
mqtt_buffers 100 1k;
Context: stream, server

This directive appeared in version 1.25.1.

Sets the number and size of the buffers used for handling MQTT messages, for a single connection.

Syntax: mqtt_rewrite_buffer_size size;
Default: 
mqtt_rewrite_buffer_size 4k|8k;
Context: server
This directive is obsolete since version 1.25.1. The mqtt_buffers directive should be used instead.

Sets the size of the buffer used for writing a modified message. By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform. It can be made smaller, however.

Syntax: mqtt_set_connect field value;
Default: — Context: server

Sets the message field to the given value for CONNECT message. The following fields are supported: clientid, username, and password. The value can contain text, variables, and their combination.

Several mqtt_set_connect directives can be specified on the same level:

mqtt_set_connect clientid "$client";
mqtt_set_connect username "$name";

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