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https://github.com/michaelfeil/iot_gateway_modbus

A MQTT Gateway connecting Modbus RTU and Google IoT Core
https://github.com/michaelfeil/iot_gateway_modbus

google-iot modbus-gateway modbus-rtu mqtt-bridge raspberry-pi

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A MQTT Gateway connecting Modbus RTU and Google IoT Core

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README 

        
# IoT_Gateway_Modbus: A MQTT Gateway connecting Modbus RTU with MQTT Bridge of Google IoT Core



Note:

This repository was an exploration with EcoPhi and Engineers without Borders Karlsruhe. Futher investigations are continoued elsewhere, this repository is discontinued.



## Scope of this solution:

This software is a user-solution of an "IoT Gateway" for Modbus RTU. 



The intitial reason for starting this solution was the need for a Gateway for Solar Microgrids.

A monitoring system for microgrids can help NGOs and companies e.g. in Eastern Africa, to prove project success and also improves predictive and reliable maintainance. 

Using a small embedded Linux/Windows computer, e.g. a Raspberry PI, low-cost Modbus RTU sensors can be read and a cost-effective monitoring solution is possible. 



## As provided this solution offers:

- Cloud: Google IoT Core

	- deploying and changing Modbus configuration from the GCP.

	- Reliable connection using Python Paho MQTT Client

	- low data footprint in GSM szenarios: compression of multiple sensor measurements using gzip  



- Modbus: Modbus RTU: RS232, RS485 via USB interface.

	- read sensor values from 5-10 Modbus RTU Slaves per second

	- schedule individual indivdual for each sensor and slave



- Cloud: Google IoT Core

	- deploying and changing Modbus configuration from the GCP.

	- Connection using Paho MQTT Client

	- low data usage: compression using gzip and multiple sensor measurement at once



- Modbus: Modbus RTU: RS232, RS485 over USB.

	- read 5-10 Modbus RTU Slaves per Second

	- schedule indivdual for every sensor

	- handling of all modbus



## Documentation Software:

- For the software documentation and installation see: [README_gateway_software.md](/src/README_gateway_software.md) 

- For additional instructions for the installation on a Raspberry Pi, follow [01_installation_raspberry_pi.md.](/implementation_raspberry_pi/01_installation_raspberry_pi.md) 



 ### Related software:

 - other clouds platforms: this module is designed for the GCP and Google IoT Core, however would also work with other MQTT Bridges.

 For Azure IoT Edge, a [Modbus Gateway](https://github.com/MicrosoftDocs/azure-docs/blob/master/articles/iot-edge/deploy-modbus-gateway.md)  module exists, [AWS Greengrass](https://docs.aws.amazon.com/greengrass/latest/developerguide/modbus-protocol-adapter-connector.html)

    

 ### About:

 Required Python 3.7.7 libaries that are not included and must be installed separatley with the [requirements.txt](/src/requirements.txt):

- "schema" is licensed under MIT Licence; available [here](https://pypi.org/project/schema/)  

- "PyJWT"  MIT Licence, 2015 Jose Padilla; available [here](https://pypi.org/project/PyJWT/)   

- "paho-mqtt"  is licensed under Eclipse Public License v1.0 / Eclipse Distribution License 1.0 ; available [here](https://pypi.org/project/paho-mqtt/)   

- "Modbus Test Kit" is licensed under LGPL Licence; available [here](https://pypi.org/project/modbus_tk/)   

- "pyserial"  is licensed under BSD-3-Clause (BSD Licence); available [here](https://pypi.org/project/pyserial/)   



This code example works with google IoT Core and other MQTT Briges. However, this code it not affiated with products of Google or Google Cloud.