sovcik / tmu2mqtt

TMU USB thermometer to MQTT

TMU to MQTT

TMU USB thermometer (www.papouch.com) to MQTT bridge

Prerequisites

1. logrotate daemon is installed
2. systemd daemon is installed
3. python >= 3.7 is installed
4. python module manager pip is installed

Installation

Run sudo bash ./install.sh
Script will

1. check prerequisites
2. install tmu2mqtt to /opt/tmu2mqtt folder
3. install default configuration
4. install tmu2mqtt service and logrotate configuration
5. start tmu2mqtt service

Configuration

Configuration is by default read from file /etc/tmu2mqtt.cfg File has ini-style structure. Required section is mqtt containing configuration needed for MQTT client. At least one section tmuN shall be present, where N is number from 1 to 99.

Collected data will be published to mqtt broker topic {mqtt.client_id}/{tmuNN.id}

Section [mqtt]

• client_id - required mqtt client id - has to be unique within mqtt broker.
• host - optional mqtt host name or ip address. Default is localhost
• port - optional mqtt broker TCP port. Default is 1883
• username - optional username. Default is none.
• password - optional password. Default is none.

Section [tmuNNN]

• port - required serial port device name, e.g. /dev/ttyUSB0
• id - optional TMU device identifier. Default is section name.
• qos - optional mqtt QOS level for data from this port. Default is 1.

Example (minimum)

[mqtt]
client_id=tmu2mqtt

[tmu1]
id=nas_temp
port=/dev/ttyUSB0

[tmu2]
id=server_temp
port=/dev/ttyUSB1

After installation

1. modify tmu2mqtt bridge configuration
   sudo nano /etc/tmu2mqtt.cfg

   Do not forget to restart service daemon - see below

2. modify tmu2mqtt logrotate configuration
   sudo nano /etc/logrotate.d/tmu2mqtt
3. modify service startup sudo nano /etc/systemd/system/tmu2mqtt.service

Usage

1. check tmu2mqtt service status sudo systemctl status tmu2mqtt
2. restart tmu2mqtt service sudo systemctl restart tmu2mqtt