eCAL <-> MQTT Bridge

A generic transparent bridge between eCAL and MQTT.

Principle

ecal-mqtt-bridge provides a functionality to bidirectionally bridge between eCAL and MQTT. This fully configurable bridge is able to manage the message transmission from eCAL to MQTT and vice versa using a yaml configuration file.

There are 3 types of messages that can be routed:

• message that contains the payload that needs to be shifted
• message that contains the type information of the payload¹
• message that contains the descriptor string

¹ By using static_ecal_type_name parameter, the type information for the eCAL protobuf message is not received via mqtt_ecal_type_name, but via this setting.

Current state of development

Due to the lack of thread support of the mosquitto library on Windows, we decided to keep only Linux support until it is fixed.

Build instructions for Linux

• Install at least version 5.11.0 of eCAL
• Add the mosquitto-dev PPA to your sources list :

sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa 
sudo apt-get update

• Install mosquitto, libmosquittopp-dev, libmosquitto-dev using: apt-get install mosquitto, libmosquittopp-dev, libmosquitto-dev

1. Clone the repository to a folder on your local machine

2. Change current directory to build_scripts and run make_all.sh

Usage

Simply run the MqttEcalBridge application. Parameters:

• -h, --help Display help
• -c=PATH, --config=PATH Use the path to a yaml file to load the configuration, otherwise place the settings.yaml file next to the executable
• -v, --verbose Print all logging information from MQTT

Note: If the MqttEcalBridge is provided as a .deb file, make sure you have installed mosquitto, libmosquittopp-dev, libmosquitto-dev at least version 2.0 .