# MQTT Benchmarking Tool

A simple MQTT benchmarking tool for Mainflux platform.

It connects Mainflux things as subscribers over a number of channels and
uses other Mainflux things to publish messages and create MQTT load.

Mainflux things used must be pre-provisioned first, and Mainflux `provision` tool can be used for this purpose.

## Installation
```
cd tools/mqtt-bench
make
```

## Usage
The tool supports multiple concurrent clients, publishers and subscribers configurable message size, etc:

```
./mqtt-bench --help
Tool for extensive load and benchmarking of MQTT brokers used within Mainflux platform.
Complete documentation is available at https://docs.mainflux.io

Usage:
  mqtt-bench [flags]

Flags:
  -b, --broker string     address for mqtt broker, for secure use tcps and 8883 (default "tcp://localhost:1883")
      --ca string         CA file (default "ca.crt")
  -c, --config string     config file for mqtt-bench (default "config.toml")
  -n, --count int         Number of messages sent per publisher (default 100)
  -f, --format string     Output format: text|json (default "text")
  -h, --help              help for mqtt-bench
  -m, --mainflux string   config file for Mainflux connections (default "connections.toml")
      --mtls              Use mtls for connection
  -p, --pubs int          Number of publishers (default 10)
  -q, --qos int           QoS for published messages, values 0 1 2
      --quiet             Supress messages
  -r, --retain            Retain mqtt messages
  -z, --size int          Size of message payload bytes (default 100)
  -t, --skipTLSVer        Skip tls verification
  -t, --timeout           Timeout mqtt messages (default 10000)
```

Two output formats supported: human-readable plain text and JSON.

Before use you need a `mfconn.toml` - a TOML file that describes Mainflux connection data (channels, thingIDs, thingKeys, certs).
You can use `provision` tool (in tools/provision) to create this TOML config file.

Example use and output

Without mtls:
```
./mqtt-bench --broker tcp://localhost:1883 --count 100 --size 100 --qos 0 --format text --pubs 10 --mainflux mfconn.toml
```

With mtls
./mqtt-bench --broker tcps://localhost:8883 --count 100 --size 100 --qos 0 --format text --pubs 10 --mainflux mfconn.toml --mtls -ca ca.crt
```

You can use `config.toml` to create tests with this tool:

```
./mqtt-bench --config config.toml
```

Example of `config.toml`:

```
[mqtt]
  [mqtt.broker]
  url = "tcp://localhost:1883"

  [mqtt.message]
  size = 100
  format = "text"
  qos = 2
  retain = true

  [mqtt.tls]
  mtls = false
  skiptlsver = true
  ca = "ca.crt"

[test]
pubs = 3
count = 100

[log]
quiet = false

[mainflux]
connections_file = "mfconn.toml"
```

Based on this, a test scenario is provided in `templates/reference.toml` file.